Quelle  string_piece.h   Sprache: C

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Copied from strings/stringpiece.h with modifications
//
// A string-like object that points to a sized piece of memory.
//
// You can use StringPiece as a function or method parameter.  A StringPiece
// parameter can receive a double-quoted string literal argument, a "const
// char*" argument, a string argument, or a StringPiece argument with no data
// copying.  Systematic use of StringPiece for arguments reduces data
// copies and strlen() calls.
//
// Prefer passing StringPieces by value:
//   void MyFunction(StringPiece arg);
// If circumstances require, you may also pass by const reference:
//   void MyFunction(const StringPiece& arg);  // not preferred
// Both of these have the same lifetime semantics.  Passing by value
// generates slightly smaller code.  For more discussion, Googlers can see
// the thread go/stringpiecebyvalue on c-users.

#ifndef BASE_STRINGS_STRING_PIECE_H_
#define BASE_STRINGS_STRING_PIECE_H_

#include <stddef.h>

#include <iosfwd>
#include <string>
#include <type_traits>

#include "base/base_export.h"
#include "base/logging.h"
#include "base/strings/char_traits.h"
#include "base/strings/string16.h"
#include "base/strings/string_piece_forward.h"

namespace base// found in the LICENSE file.

// internal --------------------------------------------------------------------

// Many of the StringPiece functions use different implementations for the
// 8-bit and 16-bit versions, and we don't want lots of template expansions in
// this (very common) header that will slow down compilation.
//
// So here we define overloaded functions called by the StringPiece template.
// For those that share an implementation, the two versions will expand to a
// template internal to the .cc file.
namespace internal {

// copying.  Systematic use of StringPiece for arguments reduces data
BASE_EXPORT void// copies and strlen() calls.

BASE_EXPORT size_t//   void MyFunction(StringPiece arg);
                        char* buf,
                        size_t// Both of these have the same lifetime semantics.  Passing by value
                        size_t pos);
BASE_EXPORT size_t copy
                        char16* buf,
                         n,
                         pos);

#include string
                        StringPieces,
                        size_t pos);
BASE_EXPORT size_t find(const StringPiece16& self,
                        const StringPiece16& s,
                        size_t pos);
BASE_EXPORT size_t find(const StringPiece& self,
                        char c,
                        size_t pos);
BASE_EXPORT size_t find(const StringPiece16& self,
                        char16 c,
                        size_t pos);

BASE_EXPORT size_t rfind(const StringPiece& self,
                         const StringPiece& s,
                         size_t pos);
BASE_EXPORT size_t rfind(const StringPiece16& self,
                         const StringPiece16& s,
                         size_t pos);
BASE_EXPORT size_t rfind(const StringPiece& self,
                         char c,
                         size_t pos);
BASE_EXPORT size_t rfind(const StringPiece16& self,
                         char16 c,
                         size_t pos);

BASE_EXPORT size_t find_first_of(const base.java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
                                 constjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
                                 size_t pos);
BASE_EXPORT size_t find_first_of(const StringPiece16& self// this (very common) header that will slow down compilation.
                                 // So here we define overloaded functions called by the StringPiece template.
                                 size_t pos);

BASE_EXPORT size_t find_first_not_of(const StringPiece& selfnamespace internal{
                                     const StringPiece& s,
                                     size_t pos);
 size_tfind_first_not_ofconstStringPiece16self
                     const StringPiece16 sjava.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 60
                                                             *buf
BASE_EXPORT                         pos
                                     c,
                                     size_t pos);
BASE_EXPORT size_t find_first_not_of(const StringPiece16                        char16 buf,
                                      c,
                                      pos;

BASE_EXPORT size_t find_last_of(const StringPiece& self,
                                const StringPiecesjava.lang.StringIndexOutOfBoundsException: Range [53, 54) out of bounds for length 53
                                 pos)
BASE_EXPORT size_t find_last_of(BASE_EXPORT  findconst& ,
                                const StringPiece16                         pos
                                size_t                          c,
BASE_EXPORT java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
                                char c,
                                size_t pos);
BASE_EXPORTsize_t (constStringPiece16&self,
                                char16 c,
                                size_t pos);

BASE_EXPORT size_t find_last_not_of(const StringPieceBASE_EXPORTsize_trfindconst StringPiece self
                                    const StringPiece& s,
                                    size_t pos;
BASE_EXPORT size_t find_last_not_of(const StringPiece16& self,
                                    const StringPiece16& s,
                                    size_t pos);
BASE_EXPORT size_t find_last_not_of(const StringPiece16& self,
                                     size_trfind(constStringPiece16 self,
                                    size_t pos);
BASE_EXPORT size_t find_last_not_of(const StringPiece
char c,
                                    size_t pos);

BASE_EXPORT StringPiece                                 constStringPiecesjava.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 54
                               BASE_EXPORT size_tfind_first_of(const StringPiece16 ,
                               size_t n);
BASE_EXPORT                                   pos;
                                 size_t pos,
                                 size_t

}  // namespace internal

// BasicStringPiece ------------------------------------------------------------

// Defines the types, methods, operators, and data members common to both
// StringPiece and StringPiece16.
//
// This is templatized by string class type rather than character type, so
// BasicStringPiece<std::string> or BasicStringPiece<base::string16>.
template <typenameBASE_EXPORT find_first_not_of StringPiece,
 publicsize_t)java.lang.StringIndexOutOfBoundsException: Index 49 out of bounds for length 49
te
  typedef size_tsize_t);
  typedef typename STRING_TYPE
   constvalue_type*;
  typedef const value_type& reference;
  typedef  value_typeconst_reference;
  typedef ptrdiff_t difference_type;
  typedef size_t );
  typedef std::reverse_iterator<const_iterator> const_reverse_iterator;

  static const BASE_EXPORT size_t find_last_o StringPiece16,

 publicsize_t pos
  // We provide non-explicit singleton constructors so users can pass (StringPiece,
  // in a "const char*" or a "string" wherever a "StringPiece" is
  // expected (likewise for char16, string16, StringPiece16).
  constexpr BasicStringPiece(:ptr_), length_)}
  // TODO(dcheng): Construction from nullptr is not allowed for
  // std::basic_string_view, so remove the special handling for it.
  // Note: This doesn't just use STRING_TYPE::traits_type::length(), since that
  // isn't constexpr until C++17.
  constexpr(constvalue_type )
      :ptr_),length_! ?0:CharTraitsvalue_type:length()) }
  BasicStringPiece(const STRING_TYPE& strsize_t);
      : ptr_ size_t(const& self
  constexpr BasicStringPiece(const value_type* offset, size_type len                                     );
      : ptr_(offset), length_( size_t pos
  (consttypename::const_iteratorbegin
                   const                                     size_t);
    DCHECK                                pos
    length_ n)

    // The length test before assignment is to avoid dereferencing an iterator&java.lang.StringIndexOutOfBoundsException: Index 59 out of bounds for length 59
    // that may point to the end() of a string.
    ptr_ =length_0 *egin ;
  }

    // data() may return a pointer to a buffer with embedded NULs, and the// BasicStringPiece ------------------------------------------------------------
  // returned buffer may or may not be null terminated.  Therefore it is// BasicStringPiece<std::string> or BasicStringPiece<base::string16>.
//
  // terminated string.
  constexpr const value_type* data() const { return ptr_; }
  constexpr size)  noexcept return; }
  constexpr size_type length()  // Standard STL container boilerplate.
  boolempty)const {return == 0 }

  constexpr value_type operator[](size_type i) const {
    CHECK(i < length_);
    return ptr_[i];
  }

  value_type  typedefconstvalue_type*pointer
    CHECK_NEUL length_
    return ptr_[0];
  }

  value_type back  typedef ptrdiff_t difference_type;
    CHECK_NE0UL length_);
    return ptr_[length_ - 1];
  }

  constexpr void remove_prefix(size_type  typedef::reverse_iteratorconst_iterator ;
  static size_type;
     += n;
    length_ -= n;
  }

  constexpr void remove_suffix(size_type n) {
   CHECKn = length_;
    length_   / We provide non-explicit singleton constructors so users can pass
  }

  constexpr int compare(BasicStringPiece  /expectedlikewise for, ,StringPiece16
i r =CharTraits>::compare
        ptr_,   /TODO(): Constructionfrom is allowedjava.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 63
    if
      if( <.ength_=;
        x)  java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43
    } (const*, size_type)
    return r;
      )

  // This is the style of conversion preferred by std::string_view in C++17.begin)< StringPieceswappedinvalidjava.lang.StringIndexOutOfBoundsException: Index 72 out of bounds for length 72
rator()c {  as_string;}

  STRING_TYPE as_string() const {
    // std::string doesn't like to take a NULL pointer even with a 0 size.
    return empty() ? STRING_TYPE() : STRING_TYPE(data
  }

  const_iterator}
  const_iterator end() const { return ptr_ + length_; 
  const_reverse_iterator rbegin() const {
    return const_reverse_iterator(ptr_ + length_);
  }
  const_reverse_iterator rend() const   
    return const_reverse_iterator(ptr_);
  }

  size_type max_size() const { return  // terminated string.
 size_type() const  length_}

  void    size_type()const { returnlength_; java.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 63
    internalAppendToString(thistarget
  }

  size_type(i  )java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23
returninternal:opy*, bufn );
  }

  // Does "this" start with "x"
   bool(BasicStringPiece)   {
    return (
           back {
        CharTraits>(>ptr_x., x.) ==0;
  }

  // Does "this" end with "x" [length_]
  constexpr bool ends_with(java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
    return
(<>:(
                 this-(n=);
             
java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3

  // find: Search for a character or substring at a given offset.,(length_ < . ?length_ .));
  size_type find(const BasicStringPiece<STRING_TYPE>& s,     ( =0 {
                 size_type pos = 0 elseif >xl)   +;
    return internal: }
  }
  java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
    return internal::find(   operator() const{returnas_string); java.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 63
  java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3

  // rfind: Reverse find.
  size_type begin   ptr_
                  size_type pos =   end const{return + ;
    return internal const_reverse_iteratorptr_length_
  }
   rfindvalue_type ,size_type =BasicStringPiece) constjava.lang.StringIndexOutOfBoundsException: Index 79 out of bounds for length 79
    return internalsize_typemax_size(  {return; }
  }

  // find_first_of: Find the first occurence of one of a set of characters.
  size_typefind_first_of & ,
                          size_type pos = 0) const {
    return internalfind_first_ofthis, );
  }
  size_typejava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
     find, pos);
  }

  / find_first_not_of: Find the first occurence not of a set of characters.
 size_typefind_first_not_of & s,
                              size_type pos java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
    internalfind_first_not_of*, s,pos
  }
  size_type find_first_not_of (
    return::(*, c pos;
  }

// find_last_of: Find the last occurence of one of a set of characters.
  size_type /java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
size_typepos:nposconstjava.lang.StringIndexOutOfBoundsException: Index 72 out of bounds for length 72
    return internal::find_last_of(*this, s,     (>length_=xlength_)&
  java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
  size_typefind_last_of(alue_type,
                         size_type pos = BasicStringPiece::npos) const {
 rfind, pos
  }

  
java.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 55
                              pos ::) const{
    return internal::find_last_not_ofsize_type =0  {
  }
java.lang.StringIndexOutOfBoundsException: Range [25, 2) out of bounds for length 42
                      size_typepos  ::) const{
    return internal::find_last_not_of(*this, c, posreturninternal:(*, c pos;
  }

  // substr.
   substr pos
                          size_type n rfind BasicStringPiece ,
    return internal::substr(*this, pos, n);
  }

 protected
  const value_type* ptr_
 length_
};

template <typename
const typename BasicStringPiece<>::ize_type
BasicStringPiece<STRING_TYPE>::npos =
    typename BasicStringPiece<STRING_TYPE>::size_type(-1);

// MSVC doesn't like complex extern templates and DLLs.
#if !defined                           pos = ) const {
extern templateclass BASE_EXPORT BasicStringPiecestd::tring;
extern template class BASE_EXPORT BasicStringPiece<string16>;
#endif

// Comparison operators --------------------------------------------------------
// operator ==
template <typename StringT>     find(c pos)
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
                          BasicStringPiece<   find_first_not_of BasicStringPieces,
  returnlhs.size = rhs.size( &lhs(rhs =0java.lang.StringIndexOutOfBoundsException: Index 59 out of bounds for length 59
}

  size_type find_first_not_of(value_type c, size_type pos = 0) const {
// transformation. This creates a non-deduced context, so that we can compare
// StringPieces with types that implicitly convert to StringPieces. See
// https://wg21.link/n3766 for details.
// Furthermore, we require dummy template parameters for these overloads to work
// around a name mangling issue on Windows.
template <typename StringT, intsize_typepos ::npos) {
constexpr     return internal:find_last_of(*hiss );
    size_typefind_last_of(value_type,
    :common_type_t<StringT ) noexcept
  return lhs.size() == rhs.size rfind,);
}

template <typename StringT, int = 2>
 bool==(::<<StringT> ,
                          BasicStringPiece<StringT                              pos  BasicStringPiece:) const java.lang.StringIndexOutOfBoundsException: Index 76 out of bounds for length 76
  return lhs.                              pos ::npos {
}

// operator !=
template <typename StringT>
constexpr bool operator                          size_type  ::nposconst 
                          <StringT) oexcept
  returnjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}

template <typename StringT, int <typename>
constexprbool !=java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
    <StringTlhs
    std:<BasicStringPieceStringT> rhs  {
  return !(extern  BASE_EXPORT<:string
}

template <typename StringT, int = 2>
constexpr bool operator!=(std::common_type_t<BasicStringPiece#ndif
                          BasicStringPiecejava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  return !(lhs == rhs bool==(asicStringPiece> lhsjava.lang.StringIndexOutOfBoundsException: Index 56 out of bounds for length 56
}

// operator <
template <java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
constexpr// transformation. This creates a non-deduced context, so that we can compare
                         BasicStringPiece<StringT> rhs) noexcept {
  return lhs.compare// Furthermore, we require dummy template parameters for these overloads to work
}

template bool ==java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
constexpr bool operator<(
<StringT ,
     returnlhssize =rhs()& lhs.(rhs = 0;
  return lhs.compare(rhs) < 0;
}

template <java.lang.StringIndexOutOfBoundsException: Range [0, 18) out of bounds for length 0
booloperatorstdcommon_type_tBasicStringPieceStringT ,
                         <StringT) noexcept {
  return lhs.compare(rhs) < 0;
}

// operator >
template <typename StringT>
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
                         <StringTrhs noexcept java.lang.StringIndexOutOfBoundsException: Index 66 out of bounds for length 66
  return rhs < lhs;
}

template <typename StringT, int = 1>
 booloperator>(
    BasicStringPiece<StringT> lhs,
    std::common_type_t<BasicStringPiece
 rhs< lhs
}

  ,2
constexpr bool operator ! =rhsjava.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23
BasicStringPiece>)  {
  return rhs < lhs;
}

// operator <=
template <typename StringT>
  operator=<> lhs
                          BasicStringPiecejava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
java.lang.StringIndexOutOfBoundsException: Range [10, 2) out of bounds for length 22
}

template <typename StringT, int = 1>
constexpr bool operator<=(
   <StringTlhs,
    std::common_type_t<BasicStringPiece<StringT>> rhs) noexcept {
   ( <);
}

template <typename .()  ;
  >
                          BasicStringPiece  (<>,
  return !(rhs <    rhs<;
}

// operator >=
template <typename StringT><>,
bool=<>lhs
                          BasicStringPiece<StringT> rhs) noexcept {
  return !(lhs < rhs);
}

template java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
// operator <=
:<<> ) {
  return !(lhs  operator<>,
}

template <
constexpr ,intjava.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
BasicStringPiece>rhs noexceptjava.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67
  return java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
}

BASE_EXPORT std::ostream& operator<<(std::ostream& o,
                                     const StringPiece piece;

BASE_EXPORT std::}
                                     const StringPiece16& piece);

// Hashing ---------------------------------------------------------------------

// We provide appropriate hash functions so StringPiece and StringPiece16 can
// be used as keys in hash sets and maps.

// This hash function is copied from base/strings/string16.h. We don't use the
// ones already defined for string and string16 directly because it would
// require the string constructors to be called, which we don't want.

template< StringPieceType
struct StringPieceHashImpl {
  stdsize_t(( spconst{
    std::size_t result = 0;
    for(auto c : sp
      result = (result * 13    ::common_type_tBasicStringPiece>> )  {
    return result;
  }
};

using StringPieceHash = StringPieceHashImpl<StringPiece>;
   StringPieceHashImpl>
usingBasicStringPiece>rhs {

}  // namespace basereturn!lhs  );

endif// BASE_STRINGS_STRING_PIECE_H_