a749e68ac4
`<optional>` needs `format_kind` and `range_format` since C++26, but it shouldn't drag in too many other stuffs necessary for `<__format/concepts.h>`.
43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
// -*- 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_FMT_PAIR_LIKE_H
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#define _LIBCPP___FORMAT_FMT_PAIR_LIKE_H
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#include <__config>
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#include <__fwd/pair.h>
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#include <__fwd/tuple.h>
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#include <__tuple/tuple_size.h>
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#include <__type_traits/is_specialization.h>
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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 >= 23
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// [tuple.like] defines a tuple-like exposition only concept. This concept is not related to that. Therefore it uses a
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// different name for the concept.
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//
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// TODO FMT Add a test to validate we fail when using that concept after P2165 has been implemented.
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// [format.range.fmtkind]/2.2.1 and [tab:formatter.range.type]:
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// "U is either a specialization of pair or a specialization of tuple such that tuple_size_v<U> is 2."
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template <class _Tp>
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concept __fmt_pair_like =
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__is_specialization_v<_Tp, pair> || (__is_specialization_v<_Tp, tuple> && tuple_size_v<_Tp> == 2);
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#endif // _LIBCPP_STD_VER >= 23
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FORMAT_FMT_PAIR_LIKE_H
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