d2baefae68
All supported compilers that support C++20 now support concepts. So, remove `_LIB_LIBCPP_HAS_NO_CONCEPTS` in favor of `_LIBCPP_STD_VER > 17`. Similarly in the tests, remove `// UNSUPPORTED: libcpp-no-concepts`. Differential Revision: https://reviews.llvm.org/D121528
41 lines
1.7 KiB
C++
41 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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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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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// UNSUPPORTED: libcpp-has-no-incomplete-ranges
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// class std::ranges::subrange;
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#include <ranges>
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#include <cassert>
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#include "test_macros.h"
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#include "test_iterators.h"
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template<std::ranges::subrange_kind K, class... Args>
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concept ValidSubrangeKind = requires { typename std::ranges::subrange<Args..., K>; };
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template<class... Args>
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concept ValidSubrange = requires { typename std::ranges::subrange<Args...>; };
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static_assert( ValidSubrange<forward_iterator<int*>>);
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static_assert( ValidSubrange<forward_iterator<int*>, forward_iterator<int*>>);
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static_assert( ValidSubrangeKind<std::ranges::subrange_kind::unsized, forward_iterator<int*>, forward_iterator<int*>>);
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static_assert( ValidSubrangeKind<std::ranges::subrange_kind::sized, forward_iterator<int*>, forward_iterator<int*>>);
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// Wrong sentinel type.
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static_assert(!ValidSubrange<forward_iterator<int*>, int*>);
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static_assert( ValidSubrange<int*>);
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static_assert( ValidSubrange<int*, int*>);
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// Must be sized.
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static_assert(!ValidSubrangeKind<std::ranges::subrange_kind::unsized, int*, int*>);
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static_assert( ValidSubrangeKind<std::ranges::subrange_kind::sized, int*, int*>);
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// Wrong sentinel type.
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static_assert(!ValidSubrange<int*, forward_iterator<int*>>);
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// Not an iterator.
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static_assert(!ValidSubrange<int>);
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