SSL decimfmt.h

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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
********************************************************************************
* Copyright (C) 1997-2016, International Business Machines
* Corporation and others. All Rights Reserved.
********************************************************************************
*
* File DECIMFMT.H
*
* Modification History:
*
* Date Name Description
* 02/19/97 aliu Converted from java.
* 03/20/97 clhuang Updated per C++ implementation.
* 04/03/97 aliu Rewrote parsing and formatting completely, and
* cleaned up and debugged. Actually works now.
* 04/17/97 aliu Changed DigitCount to int per code review.
* 07/10/97 helena Made ParsePosition a class and get rid of the function
* hiding problems.
* 09/09/97 aliu Ported over support for exponential formats.
* 07/20/98 stephen Changed documentation
* 01/30/13 emmons Added Scaling methods
********************************************************************************
*/

#ifndef DECIMFMT_H
#define DECIMFMT_H

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

/**
* \file
* \brief C++ API: Compatibility APIs for decimal formatting.
*/

#if !UCONFIG_NO_FORMATTING

#include "unicode/dcfmtsym.h"
#include "unicode/numfmt.h"
#include "unicode/locid.h"
#include "unicode/fpositer.h"
#include "unicode/stringpiece.h"
#include "unicode/curramt.h"
#include "unicode/enumset.h"

U_NAMESPACE_BEGIN

class CurrencyPluralInfo;
class CompactDecimalFormat;

namespace number {
class LocalizedNumberFormatter;
namespace impl {
class DecimalQuantity;
struct DecimalFormatFields;
class UFormattedNumberData;
}
}

namespace numparse::impl {
class NumberParserImpl;
}

/**
* **IMPORTANT:** New users are strongly encouraged to see if
* numberformatter.h fits their use case. Although not deprecated, this header
* is provided for backwards compatibility only.
*
* DecimalFormat is a concrete subclass of NumberFormat that formats decimal
* numbers. It has a variety of features designed to make it possible to parse
* and format numbers in any locale, including support for Western, Arabic, or
* Indic digits. It also supports different flavors of numbers, including
* integers ("123"), fixed-point numbers ("123.4"), scientific notation
* ("1.23E4"), percentages ("12%"), and currency amounts ("$123", "USD123",
* "123 US dollars"). All of these flavors can be easily localized.
*
* To obtain a NumberFormat for a specific locale (including the default
* locale) call one of NumberFormat's factory methods such as
* createInstance(). Do not call the DecimalFormat constructors directly, unless
* you know what you are doing, since the NumberFormat factory methods may
* return subclasses other than DecimalFormat.
*
* **Example Usage**
*
* \code
* // Normally we would have a GUI with a menu for this
* int32_t locCount;
* const Locale* locales = NumberFormat::getAvailableLocales(locCount);
*
* double myNumber = -1234.56;
* UErrorCode success = U_ZERO_ERROR;
* NumberFormat* form;
*
* // Print out a number with the localized number, currency and percent
* // format for each locale.
* UnicodeString countryName;
* UnicodeString displayName;
* UnicodeString str;
* UnicodeString pattern;
* Formattable fmtable;
* for (int32_t j = 0; j < 3; ++j) {
* cout << endl << "FORMAT " << j << endl;
* for (int32_t i = 0; i < locCount; ++i) {
* if (locales[i].getCountry(countryName).size() == 0) {
* // skip language-only
* continue;
* }
* switch (j) {
* case 0:
* form = NumberFormat::createInstance(locales[i], success ); break;
* case 1:
* form = NumberFormat::createCurrencyInstance(locales[i], success ); break;
* default:
* form = NumberFormat::createPercentInstance(locales[i], success ); break;
* }
* if (form) {
* str.remove();
* pattern = ((DecimalFormat*)form)->toPattern(pattern);
* cout << locales[i].getDisplayName(displayName) << ": " << pattern;
* cout << " -> " << form->format(myNumber,str) << endl;
* form->parse(form->format(myNumber,str), fmtable, success);
* delete form;
* }
* }
* }
* \endcode
*
* **Another example use createInstance(style)**
*
* \code
* // Print out a number using the localized number, currency,
* // percent, scientific, integer, iso currency, and plural currency
* // format for each locale
* Locale* locale = new Locale("en", "US");
* double myNumber = 1234.56;
* UErrorCode success = U_ZERO_ERROR;
* UnicodeString str;
* Formattable fmtable;
* for (int j=NumberFormat::kNumberStyle;
* j<=NumberFormat::kPluralCurrencyStyle;
* ++j) {
* NumberFormat* form = NumberFormat::createInstance(locale, j, success);
* str.remove();
* cout << "format result " << form->format(myNumber, str) << endl;
* format->parse(form->format(myNumber, str), fmtable, success);
* delete form;
* }
* \endcode
*
*
* Patterns
*
* A DecimalFormat consists of a pattern and a set of
* symbols. The pattern may be set directly using
* applyPattern(), or indirectly using other API methods which
* manipulate aspects of the pattern, such as the minimum number of integer
* digits. The symbols are stored in a DecimalFormatSymbols
* object. When using the NumberFormat factory methods, the
* pattern and symbols are read from ICU's locale data.
*
* Special Pattern Characters
*
* Many characters in a pattern are taken literally; they are matched during
* parsing and output unchanged during formatting. Special characters, on the
* other hand, stand for other characters, strings, or classes of characters.
* For example, the '#' character is replaced by a localized digit. Often the
* replacement character is the same as the pattern character; in the U.S. locale,
* the ',' grouping character is replaced by ','. However, the replacement is
* still happening, and if the symbols are modified, the grouping character
* changes. Some special characters affect the behavior of the formatter by
* their presence; for example, if the percent character is seen, then the
* value is multiplied by 100 before being displayed.
*
* To insert a special character in a pattern as a literal, that is, without
* any special meaning, the character must be quoted. There are some exceptions to
* this which are noted below.
*
* The characters listed here are used in non-localized patterns. Localized
* patterns use the corresponding characters taken from this formatter's
* DecimalFormatSymbols object instead, and these characters lose
* their special status. Two exceptions are the currency sign and quote, which
* are not localized.
*
* <table border=0 cellspacing=3 cellpadding=0>
* <tr bgcolor="#ccccff">
* <td align=left>Symbol
* <td align=left>Location
* <td align=left>Localized?
* <td align=left>Meaning
* <tr valign=top>
* <td><code>0</code>
* <td>Number
* <td>Yes
* <td>Digit
* <tr valign=top bgcolor="#eeeeff">
* <td><code>1-9</code>
* <td>Number
* <td>Yes
* <td>'1' through '9' indicate rounding.
* <tr valign=top>
* <td><code>\htmlonly@\endhtmlonly</code> 
* <td>Number
* <td>No
* <td>Significant digit
* <tr valign=top bgcolor="#eeeeff">
* <td><code>#</code>
* <td>Number
* <td>Yes
* <td>Digit, zero shows as absent
* <tr valign=top>
* <td><code>.</code>
* <td>Number
* <td>Yes
* <td>Decimal separator or monetary decimal separator
* <tr valign=top bgcolor="#eeeeff">
* <td><code>-</code>
* <td>Number
* <td>Yes
* <td>Minus sign
* <tr valign=top>
* <td><code>,</code>
* <td>Number
* <td>Yes
* <td>Grouping separator
* <tr valign=top bgcolor="#eeeeff">
* <td><code>E</code>
* <td>Number
* <td>Yes
* <td>Separates mantissa and exponent in scientific notation.
* Need not be quoted in prefix or suffix.
* <tr valign=top>
* <td><code>+</code>
* <td>Exponent
* <td>Yes
* <td>Prefix positive exponents with localized plus sign.
* Need not be quoted in prefix or suffix.
* <tr valign=top bgcolor="#eeeeff">
* <td><code>;</code>
* <td>Subpattern boundary
* <td>Yes
* <td>Separates positive and negative subpatterns
* <tr valign=top>
* <td><code>\%</code>
* <td>Prefix or suffix
* <td>Yes
* <td>Multiply by 100 and show as percentage
* <tr valign=top bgcolor="#eeeeff">
* <td><code>\\u2030</code>
* <td>Prefix or suffix
* <td>Yes
* <td>Multiply by 1000 and show as per mille
* <tr valign=top>
* <td><code>\htmlonly¤\endhtmlonly</code> (<code>\\u00A4</code>)
* <td>Prefix or suffix
* <td>No
* <td>Currency sign, replaced by currency symbol. If
* doubled, replaced by international currency symbol.
* If tripled, replaced by currency plural names, for example,
* "US dollar" or "US dollars" for America.
* If present in a pattern, the monetary decimal separator
* is used instead of the decimal separator.
* <tr valign=top bgcolor="#eeeeff">
* <td><code>'</code>
* <td>Prefix or suffix
* <td>No
* <td>Used to quote special characters in a prefix or suffix,
* for example, <code>"'#'#"</code> formats 123 to
* <code>"#123"</code>. To create a single quote
* itself, use two in a row: <code>"# o''clock"</code>.
* <tr valign=top>
* <td><code>*</code>
* <td>Prefix or suffix boundary
* <td>Yes
* <td>Pad escape, precedes pad character
* </table>
*
* A DecimalFormat pattern contains a positive and negative
* subpattern, for example, "#,##0.00;(#,##0.00)". Each subpattern has a
* prefix, a numeric part, and a suffix. If there is no explicit negative
* subpattern, the negative subpattern is the localized minus sign prefixed to the
* positive subpattern. That is, "0.00" alone is equivalent to "0.00;-0.00". If there
* is an explicit negative subpattern, it serves only to specify the negative
* prefix and suffix; the number of digits, minimal digits, and other
* characteristics are ignored in the negative subpattern. That means that
* "#,##0.0#;(#)" has precisely the same result as "#,##0.0#;(#,##0.0#)".
*
* The prefixes, suffixes, and various symbols used for infinity, digits,
* thousands separators, decimal separators, etc. may be set to arbitrary
* values, and they will appear properly during formatting. However, care must
* be taken that the symbols and strings do not conflict, or parsing will be
* unreliable. For example, either the positive and negative prefixes or the
* suffixes must be distinct for parse() to be able
* to distinguish positive from negative values. Another example is that the
* decimal separator and thousands separator should be distinct characters, or
* parsing will be impossible.
*
* The grouping separator is a character that separates clusters of
* integer digits to make large numbers more legible. It commonly used for
* thousands, but in some locales it separates ten-thousands. The grouping
* size is the number of digits between the grouping separators, such as 3
* for "100,000,000" or 4 for "1 0000 0000". There are actually two different
* grouping sizes: One used for the least significant integer digits, the
* primary grouping size, and one used for all others, the
* secondary grouping size. In most locales these are the same, but
* sometimes they are different. For example, if the primary grouping interval
* is 3, and the secondary is 2, then this corresponds to the pattern
* "#,##,##0", and the number 123456789 is formatted as "12,34,56,789". If a
* pattern contains multiple grouping separators, the interval between the last
* one and the end of the integer defines the primary grouping size, and the
* interval between the last two defines the secondary grouping size. All others
* are ignored, so "#,##,###,####" == "###,###,####" == "##,#,###,####".
*
* Illegal patterns, such as "#.#.#" or "#.###,###", will cause
* DecimalFormat to set a failing UErrorCode.
*
* Pattern BNF
*
* <pre>
* pattern := subpattern (';' subpattern)?
* subpattern := prefix? number exponent? suffix?
* number := (integer ('.' fraction)?) | sigDigits
* prefix := '\\u0000'..'\\uFFFD' - specialCharacters
* suffix := '\\u0000'..'\\uFFFD' - specialCharacters
* integer := '#'* '0'* '0'
* fraction := '0'* '#'*
* sigDigits := '#'* '@' '@'* '#'*
* exponent := 'E' '+'? '0'* '0'
* padSpec := '*' padChar
* padChar := '\\u0000'..'\\uFFFD' - quote
*  
* Notation:
* X* 0 or more instances of X
* X? 0 or 1 instances of X
* X|Y either X or Y
* C..D any character from C up to D, inclusive
* S-T characters in S, except those in T
* </pre>
* The first subpattern is for positive numbers. The second (optional)
* subpattern is for negative numbers.
*
* Not indicated in the BNF syntax above:
*
* <ul><li>The grouping separator ',' can occur inside the integer and
* sigDigits elements, between any two pattern characters of that
* element, as long as the integer or sigDigits element is not
* followed by the exponent element.
*
* <li>Two grouping intervals are recognized: That between the
* decimal point and the first grouping symbol, and that
* between the first and second grouping symbols. These
* intervals are identical in most locales, but in some
* locales they differ. For example, the pattern
* "#,##,###" formats the number 123456789 as
* "12,34,56,789".</li>
*
* <li>The pad specifier <code>padSpec</code> may appear before the prefix,
* after the prefix, before the suffix, after the suffix, or not at all.
*
* <li>In place of '0', the digits '1' through '9' may be used to
* indicate a rounding increment.
* </ul>
*
* Parsing
*
* DecimalFormat parses all Unicode characters that represent
* decimal digits, as defined by u_charDigitValue(). In addition,
* DecimalFormat also recognizes as digits the ten consecutive
* characters starting with the localized zero digit defined in the
* DecimalFormatSymbols object. During formatting, the
* DecimalFormatSymbols-based digits are output.
*
* During parsing, grouping separators are ignored if in lenient mode;
* otherwise, if present, they must be in appropriate positions.
*
* For currency parsing, the formatter is able to parse every currency
* style formats no matter which style the formatter is constructed with.
* For example, a formatter instance gotten from
* NumberFormat.getInstance(ULocale, NumberFormat.CURRENCYSTYLE) can parse
* formats such as "USD1.00" and "3.00 US dollars".
*
* If parse(UnicodeString&,Formattable&,ParsePosition&)
* fails to parse a string, it leaves the parse position unchanged.
* The convenience method parse(UnicodeString&,Formattable&,UErrorCode&>)
* indicates parse failure by setting a failing
* UErrorCode.
*
* Formatting
*
* Formatting is guided by several parameters, all of which can be
* specified either using a pattern or using the API. The following
* description applies to formats that do not use <a href="#sci">scientific
* notation</a> or <a href="#sigdig">significant digits</a>.
*
* <ul><li>If the number of actual integer digits exceeds the
* maximum integer digits, then only the least significant
* digits are shown. For example, 1997 is formatted as "97" if the
* maximum integer digits is set to 2.
*
* <li>If the number of actual integer digits is less than the
* minimum integer digits, then leading zeros are added. For
* example, 1997 is formatted as "01997" if the minimum integer digits
* is set to 5.
*
* <li>If the number of actual fraction digits exceeds the maximum
* fraction digits, then rounding is performed to the
* maximum fraction digits. For example, 0.125 is formatted as "0.12"
* if the maximum fraction digits is 2. This behavior can be changed
* by specifying a rounding increment and/or a rounding mode.
*
* <li>If the number of actual fraction digits is less than the
* minimum fraction digits, then trailing zeros are added.
* For example, 0.125 is formatted as "0.1250" if the minimum fraction
* digits is set to 4.
*
* <li>Trailing fractional zeros are not displayed if they occur
* j positions after the decimal, where j is less
* than the maximum fraction digits. For example, 0.10004 is
* formatted as "0.1" if the maximum fraction digits is four or less.
* </ul>
*
* Special Values
*
* <code>NaN</code> is represented as a single character, typically
* <code>\\uFFFD</code>. This character is determined by the
* DecimalFormatSymbols object. This is the only value for which
* the prefixes and suffixes are not used.
*
* Infinity is represented as a single character, typically
* <code>\\u221E</code>, with the positive or negative prefixes and suffixes
* applied. The infinity character is determined by the
* DecimalFormatSymbols object.
*
* <a name="sci">Scientific Notation</a>
*
* Numbers in scientific notation are expressed as the product of a mantissa
* and a power of ten, for example, 1234 can be expressed as 1.234 x 103. The
* mantissa is typically in the half-open interval [1.0, 10.0) or sometimes [0.0, 1.0),
* but it need not be. DecimalFormat supports arbitrary mantissas.
* DecimalFormat can be instructed to use scientific
* notation through the API or through the pattern. In a pattern, the exponent
* character immediately followed by one or more digit characters indicates
* scientific notation. Example: "0.###E0" formats the number 1234 as
* "1.234E3".
*
* <ul>
* <li>The number of digit characters after the exponent character gives the
* minimum exponent digit count. There is no maximum. Negative exponents are
* formatted using the localized minus sign, not the prefix and suffix
* from the pattern. This allows patterns such as "0.###E0 m/s". To prefix
* positive exponents with a localized plus sign, specify '+' between the
* exponent and the digits: "0.###E+0" will produce formats "1E+1", "1E+0",
* "1E-1", etc. (In localized patterns, use the localized plus sign rather than
* '+'.)
*
* <li>The minimum number of integer digits is achieved by adjusting the
* exponent. Example: 0.00123 formatted with "00.###E0" yields "12.3E-4". This
* only happens if there is no maximum number of integer digits. If there is a
* maximum, then the minimum number of integer digits is fixed at one.
*
* <li>The maximum number of integer digits, if present, specifies the exponent
* grouping. The most common use of this is to generate engineering
* notation, in which the exponent is a multiple of three, e.g.,
* "##0.###E0". The number 12345 is formatted using "##0.####E0" as "12.345E3".
*
* <li>When using scientific notation, the formatter controls the
* digit counts using significant digits logic. The maximum number of
* significant digits limits the total number of integer and fraction
* digits that will be shown in the mantissa; it does not affect
* parsing. For example, 12345 formatted with "##0.##E0" is "12.3E3".
* See the section on significant digits for more details.
*
* <li>The number of significant digits shown is determined as
* follows: If areSignificantDigitsUsed() returns false, then the
* minimum number of significant digits shown is one, and the maximum
* number of significant digits shown is the sum of the minimum
* integer and maximum fraction digits, and is
* unaffected by the maximum integer digits. If this sum is zero,
* then all significant digits are shown. If
* areSignificantDigitsUsed() returns true, then the significant digit
* counts are specified by getMinimumSignificantDigits() and
* getMaximumSignificantDigits(). In this case, the number of
* integer digits is fixed at one, and there is no exponent grouping.
*
* <li>Exponential patterns may not contain grouping separators.
* </ul>
*
* <a name="sigdig">Significant Digits</a>
*
* <code>DecimalFormat</code> has two ways of controlling how many
* digits are shows: (a) significant digits counts, or (b) integer and
* fraction digit counts. Integer and fraction digit counts are
* described above. When a formatter is using significant digits
* counts, the number of integer and fraction digits is not specified
* directly, and the formatter settings for these counts are ignored.
* Instead, the formatter uses however many integer and fraction
* digits are required to display the specified number of significant
* digits. Examples:
*
* <table border=0 cellspacing=3 cellpadding=0>
* <tr bgcolor="#ccccff">
* <td align=left>Pattern
* <td align=left>Minimum significant digits
* <td align=left>Maximum significant digits
* <td align=left>Number
* <td align=left>Output of format()
* <tr valign=top>
* <td><code>\@\@\@</code>
* <td>3
* <td>3
* <td>12345
* <td><code>12300</code>
* <tr valign=top bgcolor="#eeeeff">
* <td><code>\@\@\@</code>
* <td>3
* <td>3
* <td>0.12345
* <td><code>0.123</code>
* <tr valign=top>
* <td><code>\@\@##</code>
* <td>2
* <td>4
* <td>3.14159
* <td><code>3.142</code>
* <tr valign=top bgcolor="#eeeeff">
* <td><code>\@\@##</code>
* <td>2
* <td>4
* <td>1.23004
* <td><code>1.23</code>
* </table>
*
* <ul>
* <li>Significant digit counts may be expressed using patterns that
* specify a minimum and maximum number of significant digits. These
* are indicated by the <code>'@'</code> and <code>'#'</code>
* characters. The minimum number of significant digits is the number
* of <code>'@'</code> characters. The maximum number of significant
* digits is the number of <code>'@'</code> characters plus the number
* of <code>'#'</code> characters following on the right. For
* example, the pattern <code>"@@@"</code> indicates exactly 3
* significant digits. The pattern <code>"@##"</code> indicates from
* 1 to 3 significant digits. Trailing zero digits to the right of
* the decimal separator are suppressed after the minimum number of
* significant digits have been shown. For example, the pattern
* <code>"@##"</code> formats the number 0.1203 as
* <code>"0.12"</code>.
*
* <li>If a pattern uses significant digits, it may not contain a
* decimal separator, nor the <code>'0'</code> pattern character.
* Patterns such as <code>"@00"</code> or <code>"@.###"</code> are
* disallowed.
*
* <li>Any number of <code>'#'</code> characters may be prepended to
* the left of the leftmost <code>'@'</code> character. These have no
* effect on the minimum and maximum significant digits counts, but
* may be used to position grouping separators. For example,
* <code>"#,#@#"</code> indicates a minimum of one significant digits,
* a maximum of two significant digits, and a grouping size of three.
*
* <li>In order to enable significant digits formatting, use a pattern
* containing the <code>'@'</code> pattern character. Alternatively,
* call setSignificantDigitsUsed(true).
*
* <li>In order to disable significant digits formatting, use a
* pattern that does not contain the <code>'@'</code> pattern
* character. Alternatively, call setSignificantDigitsUsed(false).
*
* <li>The number of significant digits has no effect on parsing.
*
* <li>Significant digits may be used together with exponential notation. Such
* patterns are equivalent to a normal exponential pattern with a minimum and
* maximum integer digit count of one, a minimum fraction digit count of
* <code>getMinimumSignificantDigits() - 1</code>, and a maximum fraction digit
* count of <code>getMaximumSignificantDigits() - 1</code>. For example, the
* pattern <code>"@@###E0"</code> is equivalent to <code>"0.0###E0"</code>.
*
* <li>If significant digits are in use, then the integer and fraction
* digit counts, as set via the API, are ignored. If significant
* digits are not in use, then the significant digit counts, as set via
* the API, are ignored.
*
* </ul>
*
* Padding
*
* DecimalFormat supports padding the result of
* format() to a specific width. Padding may be specified either
* through the API or through the pattern syntax. In a pattern the pad escape
* character, followed by a single pad character, causes padding to be parsed
* and formatted. The pad escape character is '*' in unlocalized patterns, and
* can be localized using DecimalFormatSymbols::setSymbol() with a
* DecimalFormatSymbols::kPadEscapeSymbol
* selector. For example, <code>"$*x#,##0.00"</code> formats 123 to
* <code>"$xx123.00"</code>, and 1234 to <code>"$1,234.00"</code>.
*
* <ul>
* <li>When padding is in effect, the width of the positive subpattern,
* including prefix and suffix, determines the format width. For example, in
* the pattern <code>"* #0 o''clock"</code>, the format width is 10.
*
* <li>The width is counted in 16-bit code units (char16_ts).
*
* <li>Some parameters which usually do not matter have meaning when padding is
* used, because the pattern width is significant with padding. In the pattern
* "* ##,##,#,##0.##", the format width is 14. The initial characters "##,##,"
* do not affect the grouping size or maximum integer digits, but they do affect
* the format width.
*
* <li>Padding may be inserted at one of four locations: before the prefix,
* after the prefix, before the suffix, or after the suffix. If padding is
* specified in any other location, applyPattern()
* sets a failing UErrorCode. If there is no prefix,
* before the prefix and after the prefix are equivalent, likewise for the
* suffix.
*
* <li>When specified in a pattern, the 32-bit code point immediately
* following the pad escape is the pad character. This may be any character,
* including a special pattern character. That is, the pad escape
* escapes the following character. If there is no character after
* the pad escape, then the pattern is illegal.
*
* </ul>
*
* Rounding
*
* DecimalFormat supports rounding to a specific increment. For
* example, 1230 rounded to the nearest 50 is 1250. 1.234 rounded to the
* nearest 0.65 is 1.3. The rounding increment may be specified through the API
* or in a pattern. To specify a rounding increment in a pattern, include the
* increment in the pattern itself. "#,#50" specifies a rounding increment of
* 50. "#,##0.05" specifies a rounding increment of 0.05.
*
* In the absence of an explicit rounding increment numbers are
* rounded to their formatted width.
*
* <ul>
* <li>Rounding only affects the string produced by formatting. It does
* not affect parsing or change any numerical values.
*
* <li>A rounding mode determines how values are rounded; see
* DecimalFormat::ERoundingMode. The default rounding mode is
* DecimalFormat::kRoundHalfEven. The rounding mode can only be set
* through the API; it can not be set with a pattern.
*
* <li>Some locales use rounding in their currency formats to reflect the
* smallest currency denomination.
*
* <li>In a pattern, digits '1' through '9' specify rounding, but otherwise
* behave identically to digit '0'.
* </ul>
*
* Synchronization
*
* DecimalFormat objects are not synchronized. Multiple
* threads should not access one formatter concurrently.
*
* Subclassing
*
* User subclasses are not supported. While clients may write
* subclasses, such code will not necessarily work and will not be
* guaranteed to work stably from release to release.
*/
class U_I18N_API DecimalFormat : public NumberFormat {
 public:
 /**
 * Pad position.
 * @stable ICU 2.4
 */
 enum EPadPosition {
 kPadBeforePrefix, kPadAfterPrefix, kPadBeforeSuffix, kPadAfterSuffix
 };

 /**
 * Create a DecimalFormat using the default pattern and symbols
 * for the default locale. This is a convenient way to obtain a
 * DecimalFormat when internationalization is not the main concern.
 * 
 * To obtain standard formats for a given locale, use the factory methods
 * on NumberFormat such as createInstance. These factories will
 * return the most appropriate sub-class of NumberFormat for a given
 * locale.
 * 
 * NOTE: New users are strongly encouraged to use
 * #icu::number::NumberFormatter instead of DecimalFormat.
 * @param status Output param set to success/failure code. If the
 * pattern is invalid this will be set to a failure code.
 * @stable ICU 2.0
 */
 DecimalFormat(UErrorCode& status);

 /**
 * Create a DecimalFormat from the given pattern and the symbols
 * for the default locale. This is a convenient way to obtain a
 * DecimalFormat when internationalization is not the main concern.
 * 
 * To obtain standard formats for a given locale, use the factory methods
 * on NumberFormat such as createInstance. These factories will
 * return the most appropriate sub-class of NumberFormat for a given
 * locale.
 * 
 * NOTE: New users are strongly encouraged to use
 * #icu::number::NumberFormatter instead of DecimalFormat.
 * @param pattern A non-localized pattern string.
 * @param status Output param set to success/failure code. If the
 * pattern is invalid this will be set to a failure code.
 * @stable ICU 2.0
 */
 DecimalFormat(const UnicodeString& pattern, UErrorCode& status);

 /**
 * Create a DecimalFormat from the given pattern and symbols.
 * Use this constructor when you need to completely customize the
 * behavior of the format.
 * 
 * To obtain standard formats for a given
 * locale, use the factory methods on NumberFormat such as
 * createInstance or createCurrencyInstance. If you need only minor adjustments
 * to a standard format, you can modify the format returned by
 * a NumberFormat factory method.
 * 
 * NOTE: New users are strongly encouraged to use
 * #icu::number::NumberFormatter instead of DecimalFormat.
 *
 * @param pattern a non-localized pattern string
 * @param symbolsToAdopt the set of symbols to be used. The caller should not
 * delete this object after making this call.
 * @param status Output param set to success/failure code. If the
 * pattern is invalid this will be set to a failure code.
 * @stable ICU 2.0
 */
 DecimalFormat(const UnicodeString& pattern, DecimalFormatSymbols* symbolsToAdopt, UErrorCode& status);

#ifndef U_HIDE_INTERNAL_API

 /**
 * This API is for ICU use only.
 * Create a DecimalFormat from the given pattern, symbols, and style.
 *
 * @param pattern a non-localized pattern string
 * @param symbolsToAdopt the set of symbols to be used. The caller should not
 * delete this object after making this call.
 * @param style style of decimal format
 * @param status Output param set to success/failure code. If the
 * pattern is invalid this will be set to a failure code.
 * @internal
 */
 DecimalFormat(const UnicodeString& pattern, DecimalFormatSymbols* symbolsToAdopt,
 UNumberFormatStyle style, UErrorCode& status);

#if UCONFIG_HAVE_PARSEALLINPUT

 /**
 * @internal
 */
 void setParseAllInput(UNumberFormatAttributeValue value);

#endif

#endif /* U_HIDE_INTERNAL_API */

 private:

 /**
 * Internal constructor for DecimalFormat; sets up internal fields. All public constructors should
 * call this constructor.
 */
 DecimalFormat(const DecimalFormatSymbols* symbolsToAdopt, UErrorCode& status);

 public:

 /**
 * Set an integer attribute on this DecimalFormat.
 * May return U_UNSUPPORTED_ERROR if this instance does not support
 * the specified attribute.
 * @param attr the attribute to set
 * @param newValue new value
 * @param status the error type
 * @return *this - for chaining (example: format.setAttribute(...).setAttribute(...) )
 * @stable ICU 51
 */
 virtual DecimalFormat& setAttribute(UNumberFormatAttribute attr, int32_t newValue, UErrorCode& status);

 /**
 * Get an integer
 * May return U_UNSUPPORTED_ERROR if this instance does not support
 * the specified attribute.
 * @param attr the attribute to set
 * @param status the error type
 * @return the attribute value. Undefined if there is an error.
 * @stable ICU 51
 */
 virtual int32_t getAttribute(UNumberFormatAttribute attr, UErrorCode& status) const;

 /**
 * Set whether or not grouping will be used in this format.
 * @param newValue True, grouping will be used in this format.
 * @see getGroupingUsed
 * @stable ICU 53
 */
 void setGroupingUsed(UBool newValue) override;

 /**
 * Sets whether or not numbers should be parsed as integers only.
 * @param value set True, this format will parse numbers as integers
 * only.
 * @see isParseIntegerOnly
 * @stable ICU 53
 */
 void setParseIntegerOnly(UBool value) override;

 /**
 * Sets whether lenient parsing should be enabled (it is off by default).
 *
 * @param enable \c true if lenient parsing should be used,
 * \c false otherwise.
 * @stable ICU 4.8
 */
 void setLenient(UBool enable) override;

 /**
 * Create a DecimalFormat from the given pattern and symbols.
 * Use this constructor when you need to completely customize the
 * behavior of the format.
 * 
 * To obtain standard formats for a given
 * locale, use the factory methods on NumberFormat such as
 * createInstance or createCurrencyInstance. If you need only minor adjustments
 * to a standard format, you can modify the format returned by
 * a NumberFormat factory method.
 * 
 * NOTE: New users are strongly encouraged to use
 * #icu::number::NumberFormatter instead of DecimalFormat.
 *
 * @param pattern a non-localized pattern string
 * @param symbolsToAdopt the set of symbols to be used. The caller should not
 * delete this object after making this call.
 * @param parseError Output param to receive errors occurred during parsing
 * @param status Output param set to success/failure code. If the
 * pattern is invalid this will be set to a failure code.
 * @stable ICU 2.0
 */
 DecimalFormat(const UnicodeString& pattern, DecimalFormatSymbols* symbolsToAdopt,
 UParseError& parseError, UErrorCode& status);

 /**
 * Create a DecimalFormat from the given pattern and symbols.
 * Use this constructor when you need to completely customize the
 * behavior of the format.
 * 
 * To obtain standard formats for a given
 * locale, use the factory methods on NumberFormat such as
 * createInstance or createCurrencyInstance. If you need only minor adjustments
 * to a standard format, you can modify the format returned by
 * a NumberFormat factory method.
 * 
 * NOTE: New users are strongly encouraged to use
 * #icu::number::NumberFormatter instead of DecimalFormat.
 *
 * @param pattern a non-localized pattern string
 * @param symbols the set of symbols to be used
 * @param status Output param set to success/failure code. If the
 * pattern is invalid this will be set to a failure code.
 * @stable ICU 2.0
 */
 DecimalFormat(const UnicodeString& pattern, const DecimalFormatSymbols& symbols, UErrorCode& status);

 /**
 * Copy constructor.
 *
 * @param source the DecimalFormat object to be copied from.
 * @stable ICU 2.0
 */
 DecimalFormat(const DecimalFormat& source);

 /**
 * Assignment operator.
 *
 * @param rhs the DecimalFormat object to be copied.
 * @stable ICU 2.0
 */
 DecimalFormat& operator=(const DecimalFormat& rhs);

 /**
 * Destructor.
 * @stable ICU 2.0
 */
 ~DecimalFormat() override;

 /**
 * Clone this Format object polymorphically. The caller owns the
 * result and should delete it when done.
 *
 * @return a polymorphic copy of this DecimalFormat.
 * @stable ICU 2.0
 */
 DecimalFormat* clone() const override;

 /**
 * Return true if the given Format objects are semantically equal.
 * Objects of different subclasses are considered unequal.
 *
 * @param other the object to be compared with.
 * @return true if the given Format objects are semantically equal.
 * @stable ICU 2.0
 */
 bool operator==(const Format& other) const override;

 using NumberFormat::format;

 /**
 * Format a double or long number using base-10 representation.
 *
 * @param number The value to be formatted.
 * @param appendTo Output parameter to receive result.
 * Result is appended to existing contents.
 * @param pos On input: an alignment field, if desired.
 * On output: the offsets of the alignment field.
 * @return Reference to 'appendTo' parameter.
 * @stable ICU 2.0
 */
 UnicodeString& format(double number, UnicodeString& appendTo, FieldPosition& pos) const override;

#ifndef U_HIDE_INTERNAL_API
 /**
 * Format a double or long number using base-10 representation.
 *
 * @param number The value to be formatted.
 * @param appendTo Output parameter to receive result.
 * Result is appended to existing contents.
 * @param pos On input: an alignment field, if desired.
 * On output: the offsets of the alignment field.
 * @param status
 * @return Reference to 'appendTo' parameter.
 * @internal
 */
 UnicodeString& format(double number, UnicodeString& appendTo, FieldPosition& pos,
 UErrorCode& status) const override;
#endif /* U_HIDE_INTERNAL_API */

 /**
 * Format a double or long number using base-10 representation.
 *
 * @param number The value to be formatted.
 * @param appendTo Output parameter to receive result.
 * Result is appended to existing contents.
 * @param posIter On return, can be used to iterate over positions
 * of fields generated by this format call.
 * Can be nullptr.
 * @param status Output param filled with success/failure status.
 * @return Reference to 'appendTo' parameter.
 * @stable ICU 4.4
 */
 UnicodeString& format(double number, UnicodeString& appendTo, FieldPositionIterator* posIter,
 UErrorCode& status) const override;

 /**
 * Format a long number using base-10 representation.
 *
 * @param number The value to be formatted.
 * @param appendTo Output parameter to receive result.
 * Result is appended to existing contents.
 * @param pos On input: an alignment field, if desired.
 * On output: the offsets of the alignment field.
 * @return Reference to 'appendTo' parameter.
 * @stable ICU 2.0
 */
 UnicodeString& format(int32_t number, UnicodeString& appendTo, FieldPosition& pos) const override;

#ifndef U_HIDE_INTERNAL_API
 /**
 * Format a long number using base-10 representation.
 *
 * @param number The value to be formatted.
 * @param appendTo Output parameter to receive result.
 * Result is appended to existing contents.
 * @param pos On input: an alignment field, if desired.
 * On output: the offsets of the alignment field.
 * @param status Output param filled with success/failure status.
 * @return Reference to 'appendTo' parameter.
 * @internal
 */
 UnicodeString& format(int32_t number, UnicodeString& appendTo, FieldPosition& pos,
 UErrorCode& status) const override;
#endif /* U_HIDE_INTERNAL_API */

 /**
 * Format a long number using base-10 representation.
 *
 * @param number The value to be formatted.
 * @param appendTo Output parameter to receive result.
 * Result is appended to existing contents.
 * @param posIter On return, can be used to iterate over positions
 * of fields generated by this format call.
 * Can be nullptr.
 * @param status Output param filled with success/failure status.
 * @return Reference to 'appendTo' parameter.
 * @stable ICU 4.4
 */
 UnicodeString& format(int32_t number, UnicodeString& appendTo, FieldPositionIterator* posIter,
 UErrorCode& status) const override;

 /**
 * Format an int64 number using base-10 representation.
 *
 * @param number The value to be formatted.
 * @param appendTo Output parameter to receive result.
 * Result is appended to existing contents.
 * @param pos On input: an alignment field, if desired.
 * On output: the offsets of the alignment field.
 * @return Reference to 'appendTo' parameter.
 * @stable ICU 2.8
 */
 UnicodeString& format(int64_t number, UnicodeString& appendTo, FieldPosition& pos) const override;

#ifndef U_HIDE_INTERNAL_API
 /**
 * Format an int64 number using base-10 representation.
 *
 * @param number The value to be formatted.
 * @param appendTo Output parameter to receive result.
 * Result is appended to existing contents.
 * @param pos On input: an alignment field, if desired.
 * On output: the offsets of the alignment field.
 * @param status Output param filled with success/failure status.
 * @return Reference to 'appendTo' parameter.
 * @internal
 */
 UnicodeString& format(int64_t number, UnicodeString& appendTo, FieldPosition& pos,
 UErrorCode& status) const override;
#endif /* U_HIDE_INTERNAL_API */

 /**
 * Format an int64 number using base-10 representation.
 *
 * @param number The value to be formatted.
 * @param appendTo Output parameter to receive result.
 * Result is appended to existing contents.
 * @param posIter On return, can be used to iterate over positions
 * of fields generated by this format call.
 * Can be nullptr.
 * @param status Output param filled with success/failure status.
 * @return Reference to 'appendTo' parameter.
 * @stable ICU 4.4
 */
 UnicodeString& format(int64_t number, UnicodeString& appendTo, FieldPositionIterator* posIter,
 UErrorCode& status) const override;

 /**
 * Format a decimal number.
 * The syntax of the unformatted number is a "numeric string"
 * as defined in the Decimal Arithmetic Specification, available at
 * http://speleotrove.com/decimal
 *
 * @param number The unformatted number, as a string.
 * @param appendTo Output parameter to receive result.
 * Result is appended to existing contents.
 * @param posIter On return, can be used to iterate over positions
 * of fields generated by this format call.
 * Can be nullptr.
 * @param status Output param filled with success/failure status.
 * @return Reference to 'appendTo' parameter.
 * @stable ICU 4.4
 */
 UnicodeString& format(StringPiece number, UnicodeString& appendTo, FieldPositionIterator* posIter,
 UErrorCode& status) const override;

#ifndef U_HIDE_INTERNAL_API

 /**
 * Format a decimal number.
 * The number is a DecimalQuantity wrapper onto a floating point decimal number.
 * The default implementation in NumberFormat converts the decimal number
 * to a double and formats that.
 *
 * @param number The number, a DecimalQuantity format Decimal Floating Point.
 * @param appendTo Output parameter to receive result.
 * Result is appended to existing contents.
 * @param posIter On return, can be used to iterate over positions
 * of fields generated by this format call.
 * @param status Output param filled with success/failure status.
 * @return Reference to 'appendTo' parameter.
 * @internal
 */
 UnicodeString& format(const number::impl::DecimalQuantity& number, UnicodeString& appendTo,
 FieldPositionIterator* posIter, UErrorCode& status) const override;

 /**
 * Format a decimal number.
 * The number is a DecimalQuantity wrapper onto a floating point decimal number.
 * The default implementation in NumberFormat converts the decimal number
 * to a double and formats that.
 *
 * @param number The number, a DecimalQuantity format Decimal Floating Point.
 * @param appendTo Output parameter to receive result.
 * Result is appended to existing contents.
 * @param pos On input: an alignment field, if desired.
 * On output: the offsets of the alignment field.
 * @param status Output param filled with success/failure status.
 * @return Reference to 'appendTo' parameter.
 * @internal
 */
 UnicodeString& format(const number::impl::DecimalQuantity& number, UnicodeString& appendTo,
 FieldPosition& pos, UErrorCode& status) const override;

#endif // U_HIDE_INTERNAL_API

 using NumberFormat::parse;

 /**
 * Parse the given string using this object's choices. The method
 * does string comparisons to try to find an optimal match.
 * If no object can be parsed, index is unchanged, and nullptr is
 * returned. The result is returned as the most parsimonious
 * type of Formattable that will accommodate all of the
 * necessary precision. For example, if the result is exactly 12,
 * it will be returned as a long. However, if it is 1.5, it will
 * be returned as a double.
 *
 * @param text The text to be parsed.
 * @param result Formattable to be set to the parse result.
 * If parse fails, return contents are undefined.
 * @param parsePosition The position to start parsing at on input.
 * On output, moved to after the last successfully
 * parse character. On parse failure, does not change.
 * @see Formattable
 * @stable ICU 2.0
 */
 void parse(const UnicodeString& text, Formattable& result,
 ParsePosition& parsePosition) const override;

 /**
 * Parses text from the given string as a currency amount. Unlike
 * the parse() method, this method will attempt to parse a generic
 * currency name, searching for a match of this object's locale's
 * currency display names, or for a 3-letter ISO currency code.
 * This method will fail if this format is not a currency format,
 * that is, if it does not contain the currency pattern symbol
 * (U+00A4) in its prefix or suffix.
 *
 * @param text the string to parse
 * @param pos input-output position; on input, the position within text
 * to match; must have 0 <= pos.getIndex() < text.length();
 * on output, the position after the last matched character.
 * If the parse fails, the position in unchanged upon output.
 * @return if parse succeeds, a pointer to a newly-created CurrencyAmount
 * object (owned by the caller) containing information about
 * the parsed currency; if parse fails, this is nullptr.
 * @stable ICU 49
 */
 CurrencyAmount* parseCurrency(const UnicodeString& text, ParsePosition& pos) const override;

 /**
 * Returns the decimal format symbols, which is generally not changed
 * by the programmer or user.
 * @return desired DecimalFormatSymbols
 * @see DecimalFormatSymbols
 * @stable ICU 2.0
 */
 virtual const DecimalFormatSymbols* getDecimalFormatSymbols() const;

 /**
 * Sets the decimal format symbols, which is generally not changed
 * by the programmer or user.
 * @param symbolsToAdopt DecimalFormatSymbols to be adopted.
 * @stable ICU 2.0
 */
 virtual void adoptDecimalFormatSymbols(DecimalFormatSymbols* symbolsToAdopt);

 /**
 * Sets the decimal format symbols, which is generally not changed
 * by the programmer or user.
 * @param symbols DecimalFormatSymbols.
 * @stable ICU 2.0
 */
 virtual void setDecimalFormatSymbols(const DecimalFormatSymbols& symbols);

 /**
 * Returns the currency plural format information,
 * which is generally not changed by the programmer or user.
 * @return desired CurrencyPluralInfo
 * @stable ICU 4.2
 */
 virtual const CurrencyPluralInfo* getCurrencyPluralInfo() const;

 /**
 * Sets the currency plural format information,
 * which is generally not changed by the programmer or user.
 * @param toAdopt CurrencyPluralInfo to be adopted.
 * @stable ICU 4.2
 */
 virtual void adoptCurrencyPluralInfo(CurrencyPluralInfo* toAdopt);

 /**
 * Sets the currency plural format information,
 * which is generally not changed by the programmer or user.
 * @param info Currency Plural Info.
 * @stable ICU 4.2
 */
 virtual void setCurrencyPluralInfo(const CurrencyPluralInfo& info);

 /**
 * Get the positive prefix.
 *
 * @param result Output param which will receive the positive prefix.
 * @return A reference to 'result'.
 * Examples: +123, $123, sFr123
 * @stable ICU 2.0
 */
 UnicodeString& getPositivePrefix(UnicodeString& result) const;

 /**
 * Set the positive prefix.
 *
 * @param newValue the new value of the positive prefix to be set.
 * Examples: +123, $123, sFr123
 * @stable ICU 2.0
 */
 virtual void setPositivePrefix(const UnicodeString& newValue);

 /**
 * Get the negative prefix.
 *
 * @param result Output param which will receive the negative prefix.
 * @return A reference to 'result'.
 * Examples: -123, ($123) (with negative suffix), sFr-123
 * @stable ICU 2.0
 */
 UnicodeString& getNegativePrefix(UnicodeString& result) const;

 /**
 * Set the negative prefix.
 *
 * @param newValue the new value of the negative prefix to be set.
 * Examples: -123, ($123) (with negative suffix), sFr-123
 * @stable ICU 2.0
 */
 virtual void setNegativePrefix(const UnicodeString& newValue);

 /**
 * Get the positive suffix.
 *
 * @param result Output param which will receive the positive suffix.
 * @return A reference to 'result'.
 * Example: 123%
 * @stable ICU 2.0
 */
 UnicodeString& getPositiveSuffix(UnicodeString& result) const;

 /**
 * Set the positive suffix.
 *
 * @param newValue the new value of the positive suffix to be set.
 * Example: 123%
 * @stable ICU 2.0
 */
 virtual void setPositiveSuffix(const UnicodeString& newValue);

 /**
 * Get the negative suffix.
 *
 * @param result Output param which will receive the negative suffix.
 * @return A reference to 'result'.
 * Examples: -123%, ($123) (with positive suffixes)
 * @stable ICU 2.0
 */
 UnicodeString& getNegativeSuffix(UnicodeString& result) const;

 /**
 * Set the negative suffix.
 *
 * @param newValue the new value of the negative suffix to be set.
 * Examples: 123%
 * @stable ICU 2.0
 */
 virtual void setNegativeSuffix(const UnicodeString& newValue);

 /**
 * Whether to show the plus sign on positive (non-negative) numbers; for example, "+12"
 *
 * For more control over sign display, use NumberFormatter.
 *
 * @return Whether the sign is shown on positive numbers and zero.
 * @stable ICU 64
 */
 UBool isSignAlwaysShown() const;

 /**
 * Set whether to show the plus sign on positive (non-negative) numbers; for example, "+12".
 *
 * For more control over sign display, use NumberFormatter.
 *
 * @param value true to always show a sign; false to hide the sign on positive numbers and zero.
 * @stable ICU 64
 */
 void setSignAlwaysShown(UBool value);

 /**
 * Get the multiplier for use in percent, permill, etc.
 * For a percentage, set the suffixes to have "%" and the multiplier to be 100.
 * (For Arabic, use arabic percent symbol).
 * For a permill, set the suffixes to have "\\u2031" and the multiplier to be 1000.
 *
 * The number may also be multiplied by a power of ten; see getMultiplierScale().
 *
 * @return the multiplier for use in percent, permill, etc.
 * Examples: with 100, 1.23 -> "123", and "123" -> 1.23
 * @stable ICU 2.0
 */
 int32_t getMultiplier() const;

 /**
 * Set the multiplier for use in percent, permill, etc.
 * For a percentage, set the suffixes to have "%" and the multiplier to be 100.
 * (For Arabic, use arabic percent symbol).
 * For a permill, set the suffixes to have "\\u2031" and the multiplier to be 1000.
 *
 * This method only supports integer multipliers. To multiply by a non-integer, pair this
 * method with setMultiplierScale().
 *
 * @param newValue the new value of the multiplier for use in percent, permill, etc.
 * Examples: with 100, 1.23 -> "123", and "123" -> 1.23
 * @stable ICU 2.0
 */
 virtual void setMultiplier(int32_t newValue);

 /**
 * Gets the power of ten by which number should be multiplied before formatting, which
 * can be combined with setMultiplier() to multiply by any arbitrary decimal value.
 *
 * A multiplier scale of 2 corresponds to multiplication by 100, and a multiplier scale
 * of -2 corresponds to multiplication by 0.01.
 *
 * This method is analogous to UNUM_SCALE in getAttribute.
 *
 * @return the current value of the power-of-ten multiplier.
 * @stable ICU 62
 */
 int32_t getMultiplierScale() const;

 /**
 * Sets a power of ten by which number should be multiplied before formatting, which
 * can be combined with setMultiplier() to multiply by any arbitrary decimal value.
 *
 * A multiplier scale of 2 corresponds to multiplication by 100, and a multiplier scale
 * of -2 corresponds to multiplication by 0.01.
 *
 * For example, to multiply numbers by 0.5 before formatting, you can do:
 *
 * <pre>
 * df.setMultiplier(5);
 * df.setMultiplierScale(-1);
 * </pre>
 *
 * This method is analogous to UNUM_SCALE in setAttribute.
 *
 * @param newValue the new value of the power-of-ten multiplier.
 * @stable ICU 62
 */
 void setMultiplierScale(int32_t newValue);

 /**
 * Get the rounding increment.
 * @return A positive rounding increment, or 0.0 if a custom rounding
 * increment is not in effect.
 * @see #setRoundingIncrement
 * @see #getRoundingMode
 * @see #setRoundingMode
 * @stable ICU 2.0
 */
 virtual double getRoundingIncrement() const;

 /**
 * Set the rounding increment. In the absence of a rounding increment,
 * numbers will be rounded to the number of digits displayed.
 * @param newValue A positive rounding increment, or 0.0 to
 * use the default rounding increment.
 * Negative increments are equivalent to 0.0.
 * @see #getRoundingIncrement
 * @see #getRoundingMode
 * @see #setRoundingMode
 * @stable ICU 2.0
 */
 virtual void setRoundingIncrement(double newValue);

 /**
 * Get the rounding mode.
 * @return A rounding mode
 * @see #setRoundingIncrement
 * @see #getRoundingIncrement
 * @see #setRoundingMode
 * @stable ICU 2.0
 */
 virtual ERoundingMode getRoundingMode() const override;

 /**
 * Set the rounding mode.
 * @param roundingMode A rounding mode
 * @see #setRoundingIncrement
 * @see #getRoundingIncrement
 * @see #getRoundingMode
 * @stable ICU 2.0
 */
 virtual void setRoundingMode(ERoundingMode roundingMode) override;

 /**
 * Get the width to which the output of format() is padded.
 * The width is counted in 16-bit code units.
 * @return the format width, or zero if no padding is in effect
 * @see #setFormatWidth
 * @see #getPadCharacterString
 * @see #setPadCharacter
 * @see #getPadPosition
 * @see #setPadPosition
 * @stable ICU 2.0
 */
 virtual int32_t getFormatWidth() const;

 /**
 * Set the width to which the output of format() is padded.
 * The width is counted in 16-bit code units.
 * This method also controls whether padding is enabled.
 * @param width the width to which to pad the result of
 * format(), or zero to disable padding. A negative
 * width is equivalent to 0.
 * @see #getFormatWidth
 * @see #getPadCharacterString
 * @see #setPadCharacter
 * @see #getPadPosition
 * @see #setPadPosition
 * @stable ICU 2.0
 */
 virtual void setFormatWidth(int32_t width);

 /**
 * Get the pad character used to pad to the format width. The
 * default is ' '.
 * @return a string containing the pad character. This will always
 * have a length of one 32-bit code point.
 * @see #setFormatWidth
 * @see #getFormatWidth
 * @see #setPadCharacter
 * @see #getPadPosition
 * @see #setPadPosition
 * @stable ICU 2.0
 */
 virtual UnicodeString getPadCharacterString() const;

 /**
 * Set the character used to pad to the format width. If padding
 * is not enabled, then this will take effect if padding is later
 * enabled.
 * @param padChar a string containing the pad character. If the string
 * has length 0, then the pad character is set to ' '. Otherwise
 * padChar.char32At(0) will be used as the pad character.
 * @see #setFormatWidth
 * @see #getFormatWidth
 * @see #getPadCharacterString
 * @see #getPadPosition
 * @see #setPadPosition
 * @stable ICU 2.0
 */
 virtual void setPadCharacter(const UnicodeString& padChar);

 /**
 * Get the position at which padding will take place. This is the location
 * at which padding will be inserted if the result of format()
 * is shorter than the format width.
 * @return the pad position, one of kPadBeforePrefix,
 * kPadAfterPrefix, kPadBeforeSuffix, or
 * kPadAfterSuffix.
 * @see #setFormatWidth
 * @see #getFormatWidth
 * @see #setPadCharacter
 * @see #getPadCharacterString
 * @see #setPadPosition
 * @see #EPadPosition
 * @stable ICU 2.0
 */
 virtual EPadPosition getPadPosition() const;

 /**
 * Set the position at which padding will take place. This is the location
 * at which padding will be inserted if the result of format()
 * is shorter than the format width. This has no effect unless padding is
 * enabled.
 * @param padPos the pad position, one of kPadBeforePrefix,
 * kPadAfterPrefix, kPadBeforeSuffix, or
 * kPadAfterSuffix.
 * @see #setFormatWidth
 * @see #getFormatWidth
 * @see #setPadCharacter
 * @see #getPadCharacterString
 * @see #getPadPosition
 * @see #EPadPosition
 * @stable ICU 2.0
 */
 virtual void setPadPosition(EPadPosition padPos);

 /**
 * Return whether or not scientific notation is used.
 * @return true if this object formats and parses scientific notation
 * @see #setScientificNotation
 * @see #getMinimumExponentDigits
 * @see #setMinimumExponentDigits
 * @see #isExponentSignAlwaysShown
 * @see #setExponentSignAlwaysShown
 * @stable ICU 2.0
 */
 virtual UBool isScientificNotation() const;

 /**
 * Set whether or not scientific notation is used. When scientific notation
 * is used, the effective maximum number of integer digits is <= 8. If the
 * maximum number of integer digits is set to more than 8, the effective
 * maximum will be 1. This allows this call to generate a 'default' scientific
 * number format without additional changes.
 * @param useScientific true if this object formats and parses scientific
 * notation
 * @see #isScientificNotation
 * @see #getMinimumExponentDigits
 * @see #setMinimumExponentDigits
 * @see #isExponentSignAlwaysShown
 * @see #setExponentSignAlwaysShown
 * @stable ICU 2.0
 */
 virtual void setScientificNotation(UBool useScientific);

 /**
 * Return the minimum exponent digits that will be shown.
 * @return the minimum exponent digits that will be shown
 * @see #setScientificNotation
 * @see #isScientificNotation
 * @see #setMinimumExponentDigits
 * @see #isExponentSignAlwaysShown
 * @see #setExponentSignAlwaysShown
 * @stable ICU 2.0
 */
 virtual int8_t getMinimumExponentDigits() const;

 /**
 * Set the minimum exponent digits that will be shown. This has no
 * effect unless scientific notation is in use.
 * @param minExpDig a value >= 1 indicating the fewest exponent digits
 * that will be shown. Values less than 1 will be treated as 1.
 * @see #setScientificNotation
 * @see #isScientificNotation
 * @see #getMinimumExponentDigits
 * @see #isExponentSignAlwaysShown
 * @see #setExponentSignAlwaysShown
 * @stable ICU 2.0
 */
 virtual void setMinimumExponentDigits(int8_t minExpDig);

 /**
 * Return whether the exponent sign is always shown.
 * @return true if the exponent is always prefixed with either the
 * localized minus sign or the localized plus sign, false if only negative
 * exponents are prefixed with the localized minus sign.
 * @see #setScientificNotation
 * @see #isScientificNotation
 * @see #setMinimumExponentDigits
 * @see #getMinimumExponentDigits
 * @see #setExponentSignAlwaysShown
 * @stable ICU 2.0
 */
 virtual UBool isExponentSignAlwaysShown() const;

 /**
 * Set whether the exponent sign is always shown. This has no effect
 * unless scientific notation is in use.
 * @param expSignAlways true if the exponent is always prefixed with either
 * the localized minus sign or the localized plus sign, false if only
 * negative exponents are prefixed with the localized minus sign.
 * @see #setScientificNotation
 * @see #isScientificNotation
 * @see #setMinimumExponentDigits
 * @see #getMinimumExponentDigits
 * @see #isExponentSignAlwaysShown
 * @stable ICU 2.0
 */
 virtual void setExponentSignAlwaysShown(UBool expSignAlways);

 /**
 * Return the grouping size. Grouping size is the number of digits between
 * grouping separators in the integer portion of a number. For example,
 * in the number "123,456.78", the grouping size is 3.
 *
 * @return the grouping size.
 * @see setGroupingSize
 * @see NumberFormat::isGroupingUsed
 * @see DecimalFormatSymbols::getGroupingSeparator
 * @stable ICU 2.0
 */
 int32_t getGroupingSize() const;

 /**
 * Set the grouping size. Grouping size is the number of digits between
 * grouping separators in the integer portion of a number. For example,
 * in the number "123,456.78", the grouping size is 3.
 *
 * @param newValue the new value of the grouping size.
 * @see getGroupingSize
 * @see NumberFormat::setGroupingUsed
 * @see DecimalFormatSymbols::setGroupingSeparator
 * @stable ICU 2.0
 */
 virtual void setGroupingSize(int32_t newValue);

 /**
 * Return the secondary grouping size. In some locales one
 * grouping interval is used for the least significant integer
 * digits (the primary grouping size), and another is used for all
 * others (the secondary grouping size). A formatter supporting a
 * secondary grouping size will return a positive integer unequal
 * to the primary grouping size returned by
 * getGroupingSize(). For example, if the primary
 * grouping size is 4, and the secondary grouping size is 2, then
 * the number 123456789 formats as "1,23,45,6789", and the pattern
 * appears as "#,##,###0".
 * @return the secondary grouping size, or a value less than
 * one if there is none
 * @see setSecondaryGroupingSize
 * @see NumberFormat::isGroupingUsed
 * @see DecimalFormatSymbols::getGroupingSeparator
 * @stable ICU 2.4
 */
 int32_t getSecondaryGroupingSize() const;

 /**
 * Set the secondary grouping size. If set to a value less than 1,
 * then secondary grouping is turned off, and the primary grouping
 * size is used for all intervals, not just the least significant.
 *
 * @param newValue the new value of the secondary grouping size.
 * @see getSecondaryGroupingSize
 * @see NumberFormat#setGroupingUsed
 * @see DecimalFormatSymbols::setGroupingSeparator
 * @stable ICU 2.4
 */
 virtual void setSecondaryGroupingSize(int32_t newValue);

 /**
 * Returns the minimum number of grouping digits.
 * Grouping separators are output if there are at least this many
 * digits to the left of the first (rightmost) grouping separator,
 * that is, there are at least (minimum grouping + grouping size) integer digits.
 * (Subject to isGroupingUsed().)
 *
 * For example, if this value is 2, and the grouping size is 3, then
 * 9999 -> "9999" and 10000 -> "10,000"
 *
 * The default value for this attribute is 0.
 * A value of 1, 0, or lower, means that the use of grouping separators
 * only depends on the grouping size (and on isGroupingUsed()).
 *
 * NOTE: The CLDR data is used in NumberFormatter but not in DecimalFormat.
 * This is for backwards compatibility reasons.
 *
 * For more control over grouping strategies, use NumberFormatter.
 *
 * @see setMinimumGroupingDigits
 * @see getGroupingSize
 * @stable ICU 64
 */
 int32_t getMinimumGroupingDigits() const;

 /**
 * Sets the minimum grouping digits. Setting the value to
 * - 1: Turns off minimum grouping digits.
 * - 0 or -1: The behavior is undefined.
 * - UNUM_MINIMUM_GROUPING_DIGITS_AUTO: Display grouping using the default
 * strategy for all locales.
 * - UNUM_MINIMUM_GROUPING_DIGITS_MIN2: Display grouping using locale
 * defaults, except do not show grouping on values smaller than 10000
 * (such that there is a minimum of two digits before the first
 * separator).
 *
 * For more control over grouping strategies, use NumberFormatter.
 *
 * @param newValue the new value of minimum grouping digits.
 * @see getMinimumGroupingDigits
 * @stable ICU 64
 */
 void setMinimumGroupingDigits(int32_t newValue);

 /**
 * Allows you to get the behavior of the decimal separator with integers.
 * (The decimal separator will always appear with decimals.)
 *
 * @return true if the decimal separator always appear with decimals.
 * Example: Decimal ON: 12345 -> 12345.; OFF: 12345 -> 12345
 * @stable ICU 2.0
 */
 UBool isDecimalSeparatorAlwaysShown() const;

 /**
 * Allows you to set the behavior of the decimal separator with integers.
 * (The decimal separator will always appear with decimals.)
 *
 * @param newValue set true if the decimal separator will always appear with decimals.
 * Example: Decimal ON: 12345 -> 12345.; OFF: 12345 -> 12345
 * @stable ICU 2.0
 */
 virtual void setDecimalSeparatorAlwaysShown(UBool newValue);

 /**
 * Allows you to get the parse behavior of the pattern decimal mark.
 *
 * @return true if input must contain a match to decimal mark in pattern
 * @stable ICU 54
 */
 UBool isDecimalPatternMatchRequired() const;

 /**
 * Allows you to set the parse behavior of the pattern decimal mark.
 *
 * if true, the input must have a decimal mark if one was specified in the pattern. When
 * false the decimal mark may be omitted from the input.
 *
 * @param newValue set true if input must contain a match to decimal mark in pattern
 * @stable ICU 54
 */
 virtual void setDecimalPatternMatchRequired(UBool newValue);

 /**
 * Returns whether to ignore exponents when parsing.
 *
 * @return Whether to ignore exponents when parsing.
 * @see #setParseNoExponent
 * @stable ICU 64
 */
 UBool isParseNoExponent() const;

 /**
 * Specifies whether to stop parsing when an exponent separator is encountered. For
 * example, parses "123E4" to 123 (with parse position 3) instead of 1230000 (with parse position
 * 5).
 *
 * @param value true to prevent exponents from being parsed; false to allow them to be parsed.
 * @stable ICU 64
 */
 void setParseNoExponent(UBool value);

 /**
 * Returns whether parsing is sensitive to case (lowercase/uppercase).
 *
 * @return Whether parsing is case-sensitive.
 * @see #setParseCaseSensitive
 * @stable ICU 64
 */
 UBool isParseCaseSensitive() const;

 /**
 * Whether to pay attention to case when parsing; default is to ignore case (perform
 * case-folding). For example, "A" == "a" in case-insensitive but not case-sensitive mode.
 *
 * Currency symbols are never case-folded. For example, "us$1.00" will not parse in case-insensitive
 * mode, even though "US$1.00" parses.
 *
 * @param value true to enable case-sensitive parsing (the default); false to force
 * case-sensitive parsing behavior.
 * @stable ICU 64
 */
 void setParseCaseSensitive(UBool value);

 /**
 * Returns whether truncation of high-order integer digits should result in an error.
 * By default, setMaximumIntegerDigits truncates high-order digits silently.
 *
 * @return Whether an error code is set if high-order digits are truncated.
 * @see setFormatFailIfMoreThanMaxDigits
 * @stable ICU 64
 */
 UBool isFormatFailIfMoreThanMaxDigits() const;

 /**
 * Sets whether truncation of high-order integer digits should result in an error.
 * By default, setMaximumIntegerDigits truncates high-order digits silently.
 *
 * @param value Whether to set an error code if high-order digits are truncated.
 * @stable ICU 64
 */
 void setFormatFailIfMoreThanMaxDigits(UBool value);

 /**
 * Synthesizes a pattern string that represents the current state
 * of this Format object.
 *
 * @param result Output param which will receive the pattern.
 * Previous contents are deleted.
 * @return A reference to 'result'.
 * @see applyPattern
 * @stable ICU 2.0
 */
 virtual UnicodeString& toPattern(UnicodeString& result) const;

 /**
 * Synthesizes a localized pattern string that represents the current
 * state of this Format object.
 *
 * @param result Output param which will receive the localized pattern.
 * Previous contents are deleted.
 * @return A reference to 'result'.
 * @see applyPattern
 * @stable ICU 2.0
 */
 virtual UnicodeString& toLocalizedPattern(UnicodeString& result) const;

 /**
 * Apply the given pattern to this Format object. A pattern is a
 * short-hand specification for the various formatting properties.
 * These properties can also be changed individually through the
 * various setter methods.
 * 
 * There is no limit to integer digits are set
 * by this routine, since that is the typical end-user desire;
 * use setMaximumInteger if you want to set a real value.
 * For negative numbers, use a second pattern, separated by a semicolon
 * <pre>
 * . Example "#,#00.0#" -> 1,234.56
 * </pre>
 * This means a minimum of 2 integer digits, 1 fraction digit, and
 * a maximum of 2 fraction digits.
 * <pre>
 * . Example: "#,#00.0#;(#,#00.0#)" for negatives in parentheses.
 * </pre>
 * In negative patterns, the minimum and maximum counts are ignored;
 * these are presumed to be set in the positive pattern.
 *
 * @param pattern The pattern to be applied.
 * @param parseError Struct to receive information on position
 * of error if an error is encountered
 * @param status Output param set to success/failure code on
 * exit. If the pattern is invalid, this will be
 * set to a failure result.
 * @stable ICU 2.0
 */
 virtual void applyPattern(const UnicodeString& pattern, UParseError& parseError, UErrorCode& status);

 /**
 * Sets the pattern.
 * @param pattern The pattern to be applied.
 * @param status Output param set to success/failure code on
 * exit. If the pattern is invalid, this will be
 * set to a failure result.
 * @stable ICU 2.0
 */
 virtual void applyPattern(const UnicodeString& pattern, UErrorCode& status);

 /**
 * Apply the given pattern to this Format object. The pattern
 * is assumed to be in a localized notation. A pattern is a
 * short-hand specification for the various formatting properties.
 * These properties can also be changed individually through the
 * various setter methods.
 * 
 * There is no limit to integer digits are set
 * by this routine, since that is the typical end-user desire;
 * use setMaximumInteger if you want to set a real value.
 * For negative numbers, use a second pattern, separated by a semicolon
 * <pre>
 * . Example "#,#00.0#" -> 1,234.56
 * </pre>
 * This means a minimum of 2 integer digits, 1 fraction digit, and
 * a maximum of 2 fraction digits.
 *
 * Example: "#,#00.0#;(#,#00.0#)" for negatives in parentheses.
 *
 * In negative patterns, the minimum and maximum counts are ignored;
 * these are presumed to be set in the positive pattern.
 *
 * @param pattern The localized pattern to be applied.
 * @param parseError Struct to receive information on position
 * of error if an error is encountered
 * @param status Output param set to success/failure code on
 * exit. If the pattern is invalid, this will be
 * set to a failure result.
 * @stable ICU 2.0
 */
 virtual void applyLocalizedPattern(const UnicodeString& pattern, UParseError& parseError,
 UErrorCode& status);

 /**
 * Apply the given pattern to this Format object.
 *
 * @param pattern The localized pattern to be applied.
 * @param status Output param set to success/failure code on
 * exit. If the pattern is invalid, this will be
 * set to a failure result.
 * @stable ICU 2.0
 */
 virtual void applyLocalizedPattern(const UnicodeString& pattern, UErrorCode& status);

 /**
 * Sets the maximum number of digits allowed in the integer portion of a
 * number. This override limits the integer digit count to 309.
 *
 * @param newValue the new value of the maximum number of digits
 * allowed in the integer portion of a number.
 * @see NumberFormat#setMaximumIntegerDigits
 * @stable ICU 2.0
 */
 void setMaximumIntegerDigits(int32_t newValue) override;

 /**
 * Sets the minimum number of digits allowed in the integer portion of a
 * number. This override limits the integer digit count to 309.
 *
 * @param newValue the new value of the minimum number of digits
 * allowed in the integer portion of a number.
 * @see NumberFormat#setMinimumIntegerDigits
 * @stable ICU 2.0
 */
 void setMinimumIntegerDigits(int32_t newValue) override;

 /**
 * Sets the maximum number of digits allowed in the fraction portion of a
 * number. This override limits the fraction digit count to 340.
 *
 * @param newValue the new value of the maximum number of digits
 * allowed in the fraction portion of a number.
 * @see NumberFormat#setMaximumFractionDigits
 * @stable ICU 2.0
 */
 void setMaximumFractionDigits(int32_t newValue) override;

 /**
 * Sets the minimum number of digits allowed in the fraction portion of a
 * number. This override limits the fraction digit count to 340.
 *
 * @param newValue the new value of the minimum number of digits
 * allowed in the fraction portion of a number.
 * @see NumberFormat#setMinimumFractionDigits
 * @stable ICU 2.0
 */
 void setMinimumFractionDigits(int32_t newValue) override;

 /**
 * Returns the minimum number of significant digits that will be
 * displayed. This value has no effect unless areSignificantDigitsUsed()
 * returns true.
 * @return the fewest significant digits that will be shown
 * @stable ICU 3.0
 */
 int32_t getMinimumSignificantDigits() const;

 /**
 * Returns the maximum number of significant digits that will be
 * displayed. This value has no effect unless areSignificantDigitsUsed()
 * returns true.
 * @return the most significant digits that will be shown
 * @stable ICU 3.0
 */
 int32_t getMaximumSignificantDigits() const;

 /**
 * Sets the minimum number of significant digits that will be
 * displayed. If <code>min</code> is less than one then it is set
 * to one. If the maximum significant digits count is less than
 * <code>min</code>, then it is set to <code>min</code>.
 * This function also enables the use of significant digits
 * by this formatter - areSignificantDigitsUsed() will return true.
 * @see #areSignificantDigitsUsed
 * @param min the fewest significant digits to be shown
 * @stable ICU 3.0
 */
 void setMinimumSignificantDigits(int32_t min);

 /**
 * Sets the maximum number of significant digits that will be
 * displayed. If <code>max</code> is less than one then it is set
 * to one. If the minimum significant digits count is greater
 * than <code>max</code>, then it is set to <code>max</code>.
 * This function also enables the use of significant digits
 * by this formatter - areSignificantDigitsUsed() will return true.
 * @see #areSignificantDigitsUsed
 * @param max the most significant digits to be shown
 * @stable ICU 3.0
 */
 void setMaximumSignificantDigits(int32_t max);

 /**
 * Returns true if significant digits are in use, or false if
 * integer and fraction digit counts are in use.
 * @return true if significant digits are in use
 * @stable ICU 3.0
 */
 UBool areSignificantDigitsUsed() const;

 /**
 * Sets whether significant digits are in use, or integer and
 * fraction digit counts are in use.
 * @param useSignificantDigits true to use significant digits, or
 * false to use integer and fraction digit counts
 * @stable ICU 3.0
 */
 void setSignificantDigitsUsed(UBool useSignificantDigits);

 /**
 * Sets the currency used to display currency
 * amounts. This takes effect immediately, if this format is a
 * currency format. If this format is not a currency format, then
 * the currency is used if and when this object becomes a
 * currency format through the application of a new pattern.
 * @param theCurrency a 3-letter ISO code indicating new currency
 * to use. It need not be null-terminated. May be the empty
 * string or nullptr to indicate no currency.
 * @param ec input-output error code
 * @stable ICU 3.0
 */
 void setCurrency(const char16_t* theCurrency, UErrorCode& ec) override;

#ifndef U_FORCE_HIDE_DEPRECATED_API
 /**
 * Sets the currency used to display currency amounts. See
 * setCurrency(const char16_t*, UErrorCode&).
 * @deprecated ICU 3.0. Use setCurrency(const char16_t*, UErrorCode&).
 */
 virtual void setCurrency(const char16_t* theCurrency);
#endif // U_FORCE_HIDE_DEPRECATED_API

 /**
 * Sets the `Currency Usage` object used to display currency.
 * This takes effect immediately, if this format is a
 * currency format.
 * @param newUsage new currency usage object to use.
 * @param ec input-output error code
 * @stable ICU 54
 */
 void setCurrencyUsage(UCurrencyUsage newUsage, UErrorCode* ec);

 /**
 * Returns the `Currency Usage` object used to display currency
 * @stable ICU 54
 */
 UCurrencyUsage getCurrencyUsage() const;

#ifndef U_HIDE_INTERNAL_API

 /**
 * Format a number and save it into the given DecimalQuantity.
 * Internal, not intended for public use.
 * @internal
 */
 void formatToDecimalQuantity(double number, number::impl::DecimalQuantity& output,
 UErrorCode& status) const;

 /**
 * Get a DecimalQuantity corresponding to a formattable as it would be
 * formatted by this DecimalFormat.
 * Internal, not intended for public use.
 * @internal
 */
 void formatToDecimalQuantity(const Formattable& number, number::impl::DecimalQuantity& output,
 UErrorCode& status) const;

#endif /* U_HIDE_INTERNAL_API */

 /**
 * Converts this DecimalFormat to a (Localized)NumberFormatter. Starting
 * in ICU 60, NumberFormatter is the recommended way to format numbers.
 * You can use the returned LocalizedNumberFormatter to format numbers and
 * get a FormattedNumber, which contains a string as well as additional
 * annotations about the formatted value.
 *
 * If a memory allocation failure occurs, the return value of this method
 * might be null. If you are concerned about correct recovery from
 * out-of-memory situations, use this pattern:
 *
 * <pre>
 * FormattedNumber result;
 * if (auto* ptr = df->toNumberFormatter(status)) {
 * result = ptr->formatDouble(123, status);
 * }
 * </pre>
 *
 * If you are not concerned about out-of-memory situations, or if your
 * environment throws exceptions when memory allocation failure occurs,
 * you can chain the methods, like this:
 *
 * <pre>
 * FormattedNumber result = df
 * ->toNumberFormatter(status)
 * ->formatDouble(123, status);
 * </pre>
 *
 * NOTE: The returned LocalizedNumberFormatter is owned by this DecimalFormat.
 * If a non-const method is called on the DecimalFormat, or if the DecimalFormat
 * is deleted, the object becomes invalid. If you plan to keep the return value
 * beyond the lifetime of the DecimalFormat, copy it to a local variable:
 *
 * <pre>
 * LocalizedNumberFormatter lnf;
 * if (auto* ptr = df->toNumberFormatter(status)) {
 * lnf = *ptr;
 * }
 * </pre>
 *
 * @param status Set on failure, like U_MEMORY_ALLOCATION_ERROR.
 * @return A pointer to an internal object, or nullptr on failure.
 * Do not delete the return value!
 * @stable ICU 64
 */
 const number::LocalizedNumberFormatter* toNumberFormatter(UErrorCode& status) const;

 /**
 * Return the class ID for this class. This is useful only for
 * comparing to a return value from getDynamicClassID(). For example:
 * <pre>
 * . Base* polymorphic_pointer = createPolymorphicObject();
 * . if (polymorphic_pointer->getDynamicClassID() ==
 * . Derived::getStaticClassID()) ...
 * </pre>
 * @return The class ID for all objects of this class.
 * @stable ICU 2.0
 */
 static UClassID U_EXPORT2 getStaticClassID();

 /**
 * Returns a unique class ID POLYMORPHICALLY. Pure virtual override.
 * This method is to implement a simple version of RTTI, since not all
 * C++ compilers support genuine RTTI. Polymorphic operator==() and
 * clone() methods call this method.
 *
 * @return The class ID for this object. All objects of a
 * given class have the same class ID. Objects of
 * other classes have different class IDs.
 * @stable ICU 2.0
 */
 UClassID getDynamicClassID() const override;

 private:

 /** Rebuilds the formatter object from the property bag. */
 void touch(UErrorCode& status);

 /** Rebuilds the formatter object, ignoring any error code. */
 void touchNoError();

 /**
 * Updates the property bag with settings from the given pattern.
 *
 * @param pattern The pattern string to parse.
 * @param ignoreRounding Whether to leave out rounding information (minFrac, maxFrac, and rounding
 * increment) when parsing the pattern. This may be desirable if a custom rounding mode, such
 * as CurrencyUsage, is to be used instead. One of {@link
 * PatternStringParser#IGNORE_ROUNDING_ALWAYS}, {@link PatternStringParser#IGNORE_ROUNDING_IF_CURRENCY},
 * or {@link PatternStringParser#IGNORE_ROUNDING_NEVER}.
 * @see PatternAndPropertyUtils#parseToExistingProperties
 */
 void setPropertiesFromPattern(const UnicodeString& pattern, int32_t ignoreRounding,
 UErrorCode& status);

 const numparse::impl::NumberParserImpl* getParser(UErrorCode& status) const;

 const numparse::impl::NumberParserImpl* getCurrencyParser(UErrorCode& status) const;

 static void fieldPositionHelper(
 const number::impl::UFormattedNumberData& formatted,
 FieldPosition& fieldPosition,
 int32_t offset,
 UErrorCode& status);

 static void fieldPositionIteratorHelper(
 const number::impl::UFormattedNumberData& formatted,
 FieldPositionIterator* fpi,
 int32_t offset,
 UErrorCode& status);

 void setupFastFormat();

 bool fastFormatDouble(double input, UnicodeString& output) const;

 bool fastFormatInt64(int64_t input, UnicodeString& output) const;

 void doFastFormatInt32(int32_t input, bool isNegative, UnicodeString& output) const;

 //=====================================================================================//
 // INSTANCE FIELDS //
 //=====================================================================================//

 // One instance field for the implementation, keep all fields inside of an implementation
 // class defined in number_mapper.h
 number::impl::DecimalFormatFields* fields = nullptr;

 // Allow child class CompactDecimalFormat to access fProperties:
 friend class CompactDecimalFormat;

 // Allow MeasureFormat to use fieldPositionHelper:
 friend class MeasureFormat;

};

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_FORMATTING */

#endif /* U_SHOW_CPLUSPLUS_API */

#endif // _DECIMFMT
//eof

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