mirror of
https://github.com/llvm/llvm-project.git
synced 2025-04-25 09:36:06 +00:00
b9a2658a3e
This patch implements the forwarding to frozen C++03 headers as discussed in https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the RFC, we initially proposed selecting the right headers from the Clang driver, however consensus seemed to steer towards handling this in the library itself. This patch implements that direction. At a high level, the changes basically amount to making each public header look like this: ``` // inside <vector> #ifdef _LIBCPP_CXX03_LANG # include <__cxx03/vector> #else // normal <vector> content #endif ``` In most cases, public headers are simple umbrella headers so there isn't much code in the #else branch. In other cases, the #else branch contains the actual implementation of the header.
122 lines
4.2 KiB
C++
122 lines
4.2 KiB
C++
// -*- C++ -*-
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef _LIBCPP_CHARCONV
|
|
#define _LIBCPP_CHARCONV
|
|
|
|
/*
|
|
charconv synopsis
|
|
|
|
namespace std {
|
|
|
|
// floating-point format for primitive numerical conversion
|
|
enum class chars_format {
|
|
scientific = unspecified,
|
|
fixed = unspecified,
|
|
hex = unspecified,
|
|
general = fixed | scientific
|
|
};
|
|
|
|
// 23.20.2, primitive numerical output conversion
|
|
struct to_chars_result {
|
|
char* ptr;
|
|
errc ec;
|
|
friend bool operator==(const to_chars_result&, const to_chars_result&) = default; // since C++20
|
|
constexpr explicit operator bool() const noexcept { return ec == errc{}; } // since C++26
|
|
};
|
|
|
|
constexpr to_chars_result to_chars(char* first, char* last, see below value,
|
|
int base = 10); // constexpr since C++23
|
|
to_chars_result to_chars(char* first, char* last, bool value,
|
|
int base = 10) = delete;
|
|
|
|
to_chars_result to_chars(char* first, char* last, float value);
|
|
to_chars_result to_chars(char* first, char* last, double value);
|
|
to_chars_result to_chars(char* first, char* last, long double value);
|
|
|
|
to_chars_result to_chars(char* first, char* last, float value,
|
|
chars_format fmt);
|
|
to_chars_result to_chars(char* first, char* last, double value,
|
|
chars_format fmt);
|
|
to_chars_result to_chars(char* first, char* last, long double value,
|
|
chars_format fmt);
|
|
|
|
to_chars_result to_chars(char* first, char* last, float value,
|
|
chars_format fmt, int precision);
|
|
to_chars_result to_chars(char* first, char* last, double value,
|
|
chars_format fmt, int precision);
|
|
to_chars_result to_chars(char* first, char* last, long double value,
|
|
chars_format fmt, int precision);
|
|
|
|
// 23.20.3, primitive numerical input conversion
|
|
struct from_chars_result {
|
|
const char* ptr;
|
|
errc ec;
|
|
friend bool operator==(const from_chars_result&, const from_chars_result&) = default; // since C++20
|
|
constexpr explicit operator bool() const noexcept { return ec == errc{}; } // since C++26
|
|
};
|
|
|
|
constexpr from_chars_result from_chars(const char* first, const char* last,
|
|
see below& value, int base = 10); // constexpr since C++23
|
|
|
|
from_chars_result from_chars(const char* first, const char* last,
|
|
float& value, chars_format fmt);
|
|
|
|
from_chars_result from_chars(const char* first, const char* last,
|
|
double& value, chars_format fmt);
|
|
|
|
} // namespace std
|
|
|
|
*/
|
|
|
|
#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
|
|
# include <__cxx03/charconv>
|
|
#else
|
|
# include <__config>
|
|
|
|
# if _LIBCPP_STD_VER >= 17
|
|
# include <__charconv/chars_format.h>
|
|
# include <__charconv/from_chars_floating_point.h>
|
|
# include <__charconv/from_chars_integral.h>
|
|
# include <__charconv/from_chars_result.h>
|
|
# include <__charconv/tables.h>
|
|
# include <__charconv/to_chars.h>
|
|
# include <__charconv/to_chars_base_10.h>
|
|
# include <__charconv/to_chars_floating_point.h>
|
|
# include <__charconv/to_chars_integral.h>
|
|
# include <__charconv/to_chars_result.h>
|
|
# include <__charconv/traits.h>
|
|
# endif // _LIBCPP_STD_VER >= 17
|
|
|
|
# include <version>
|
|
|
|
# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
# endif
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
|
|
# include <cmath>
|
|
# include <concepts>
|
|
# include <cstddef>
|
|
# include <cstdint>
|
|
# include <cstdlib>
|
|
# include <cstring>
|
|
# include <iosfwd>
|
|
# include <limits>
|
|
# include <new>
|
|
# include <type_traits>
|
|
# endif
|
|
#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
|
|
|
|
#endif // _LIBCPP_CHARCONV
|