48 lines
1.5 KiB
C++
48 lines
1.5 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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// concept checking
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// template<view V, class Pred>
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// requires input_range<V> && is_object_v<Pred> &&
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// indirect_unary_predicate<const Pred, iterator_t<V>>
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// class take_while_view;
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#include <array>
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#include <ranges>
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#include "test_iterators.h"
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template <class It>
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using Range = std::ranges::subrange<It, sentinel_wrapper<It>>;
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template <class Val = int>
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struct Pred {
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bool operator()(const Val&) const;
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};
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template <class V, class Pred>
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concept HasTakeWhileView = requires { typename std::ranges::take_while_view<V, Pred>; };
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static_assert(HasTakeWhileView<Range<int*>, bool (*)(int)>);
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static_assert(HasTakeWhileView<Range<int*>, Pred<int>>);
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// !view<V>
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static_assert(!HasTakeWhileView<std::array<int, 5>, Pred<int>>);
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// !input_range
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static_assert(!HasTakeWhileView<Range<cpp20_output_iterator<int*>>, bool (*)(int)>);
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// !is_object_v<Pred>
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static_assert(!HasTakeWhileView<Range<int*>, Pred<int>&>);
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// !indirect_unary_predicate<const Pred, iterator_t<V>>
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static_assert(!HasTakeWhileView<Range<int*>, int>);
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static_assert(!HasTakeWhileView<Range<int**>, Pred<int>>);
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