mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
83 lines
2.8 KiB
C++
83 lines
2.8 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___FORMAT_CONCEPTS_H
|
|
#define _LIBCPP___FORMAT_CONCEPTS_H
|
|
|
|
#include <__concepts/same_as.h>
|
|
#include <__concepts/semiregular.h>
|
|
#include <__config>
|
|
#include <__format/format_parse_context.h>
|
|
#include <__fwd/format.h>
|
|
#include <__fwd/tuple.h>
|
|
#include <__tuple/tuple_size.h>
|
|
#include <__type_traits/is_specialization.h>
|
|
#include <__type_traits/remove_const.h>
|
|
#include <__type_traits/remove_reference.h>
|
|
#include <__utility/pair.h>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
#if _LIBCPP_STD_VER >= 20
|
|
|
|
/// The character type specializations of \ref formatter.
|
|
template <class _CharT>
|
|
concept __fmt_char_type =
|
|
same_as<_CharT, char>
|
|
# ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
|
|
|| same_as<_CharT, wchar_t>
|
|
# endif
|
|
;
|
|
|
|
// The output iterator isn't specified. A formatter should accept any
|
|
// output_iterator. This iterator is a minimal iterator to test the concept.
|
|
// (Note testing for (w)format_context would be a valid choice, but requires
|
|
// selecting the proper one depending on the type of _CharT.)
|
|
template <class _CharT>
|
|
using __fmt_iter_for = _CharT*;
|
|
|
|
template <class _Tp, class _Context, class _Formatter = typename _Context::template formatter_type<remove_const_t<_Tp>>>
|
|
concept __formattable_with =
|
|
semiregular<_Formatter> &&
|
|
requires(_Formatter& __f,
|
|
const _Formatter& __cf,
|
|
_Tp&& __t,
|
|
_Context __fc,
|
|
basic_format_parse_context<typename _Context::char_type> __pc) {
|
|
{ __f.parse(__pc) } -> same_as<typename decltype(__pc)::iterator>;
|
|
{ __cf.format(__t, __fc) } -> same_as<typename _Context::iterator>;
|
|
};
|
|
|
|
template <class _Tp, class _CharT>
|
|
concept __formattable =
|
|
__formattable_with<remove_reference_t<_Tp>, basic_format_context<__fmt_iter_for<_CharT>, _CharT>>;
|
|
|
|
# if _LIBCPP_STD_VER >= 23
|
|
template <class _Tp, class _CharT>
|
|
concept formattable = __formattable<_Tp, _CharT>;
|
|
|
|
// [tuple.like] defines a tuple-like exposition only concept. This concept is
|
|
// not related to that. Therefore it uses a different name for the concept.
|
|
//
|
|
// TODO FMT Add a test to validate we fail when using that concept after P2165
|
|
// has been implemented.
|
|
template <class _Tp>
|
|
concept __fmt_pair_like =
|
|
__is_specialization_v<_Tp, pair> || (__is_specialization_v<_Tp, tuple> && tuple_size_v<_Tp> == 2);
|
|
|
|
# endif //_LIBCPP_STD_VER >= 23
|
|
#endif //_LIBCPP_STD_VER >= 20
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP___FORMAT_CONCEPTS_H
|