| Quellcodebibliothek Statistik Leitseite products/Sources/formale Sprachen/C/Firefox/js/src/util/ (Browser von der Mozilla Stiftung Version 136.0.1©) Datei vom 10.2.2025 mit Größe 1 kB |
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Quelle DoubleToString.h Sprache: C |
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- * vim: set ts=8 sts=2 et sw=2 tw=80: * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifndef util_DoubleToString_h #define util_DoubleToString_h /* * Public interface to portable double-precision floating point to string * and back conversion package. */ struct DtoaState; namespace js { extern DtoaState* NewDtoaState(); extern void DestroyDtoaState(DtoaState* state); } // namespace js /* Maximum number of characters (including trailing null) that a DTOSTR_STANDARD * or DTOSTR_STANDARD_EXPONENTIAL conversion can produce. This maximum is * reached for a number like -0.0000012345678901234567. */ #define DTOSTR_STANDARD_BUFFER_SIZE 26 /* * DO NOT USE THIS FUNCTION IF YOU CAN AVOID IT. js::NumberToCString() is a * better function to use. * * Convert d to a string in the given base. The integral part of d will be * printed exactly in that base, regardless of how large it is, because there * is no exponential notation for non-base-ten numbers. The fractional part * will be rounded to as few digits as possible while still preserving the * round-trip property (analogous to that of printing decimal numbers). In * other words, if one were to read the resulting string in via a hypothetical * base-number-reading routine that rounds to the nearest IEEE double (and to * an even significand if there are two equally near doubles), then the result * would equal d (except for -0.0, which converts to "0", and NaN, which is * not equal to itself). * * Return nullptr if out of memory. If the result is not nullptr, it must be * released via js_free(). */ char* js_dtobasestr(DtoaState* state, int base, double d); #endif /* util_DoubleToString_h */
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2026-04-02