forked from OSchip/llvm-project
54 lines
2.1 KiB
C
54 lines
2.1 KiB
C
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// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___FORMAT_CONCEPTS_H
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#define _LIBCPP___FORMAT_CONCEPTS_H
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#include <__concepts/same_as.h>
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#include <__concepts/semiregular.h>
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#include <__config>
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#include <__format/format_fwd.h>
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#include <__format/format_parse_context.h>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 17
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// The output iterator isn't specified. A formatter should accept any
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// output_iterator. This iterator is a minimal iterator to test the concept.
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// (Note testing for (w)format_context would be a valid choice, but requires
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// selecting the proper one depending on the type of _CharT.)
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template <class _CharT>
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using __fmt_iter_for = _CharT*;
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// The concept is based on P2286R6
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// It lacks the const of __cf as required by, the not yet accepted, LWG-3636.
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// The current formatters can't be easily adapted, but that is WIP.
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// TODO FMT properly implement this concepts once accepted.
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template <class _Tp, class _CharT>
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concept __formattable = (semiregular<formatter<remove_cvref_t<_Tp>, _CharT>>) &&
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requires(formatter<remove_cvref_t<_Tp>, _CharT> __f,
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formatter<remove_cvref_t<_Tp>, _CharT> __cf, _Tp __t,
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basic_format_context<__fmt_iter_for<_CharT>, _CharT> __fc,
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basic_format_parse_context<_CharT> __pc) {
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{ __f.parse(__pc) } -> same_as<typename basic_format_parse_context<_CharT>::iterator>;
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{ __cf.format(__t, __fc) } -> same_as<__fmt_iter_for<_CharT>>;
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};
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#endif //_LIBCPP_STD_VER > 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FORMAT_CONCEPTS_H
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