| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| |
| // concept checking |
| // template<view V, class Pred> |
| // requires input_range<V> && is_object_v<Pred> && |
| // indirect_unary_predicate<const Pred, iterator_t<V>> |
| // class take_while_view; |
| |
| #include <array> |
| #include <ranges> |
| |
| #include "test_iterators.h" |
| |
| template <class It> |
| using Range = std::ranges::subrange<It, sentinel_wrapper<It>>; |
| |
| template <class Val = int> |
| struct Pred { |
| bool operator()(const Val&) const; |
| }; |
| |
| template <class V, class Pred> |
| concept HasTakeWhileView = requires { typename std::ranges::take_while_view<V, Pred>; }; |
| |
| static_assert(HasTakeWhileView<Range<int*>, bool (*)(int)>); |
| static_assert(HasTakeWhileView<Range<int*>, Pred<int>>); |
| |
| // !view<V> |
| static_assert(!HasTakeWhileView<std::array<int, 5>, Pred<int>>); |
| |
| // !input_range |
| static_assert(!HasTakeWhileView<Range<cpp20_output_iterator<int*>>, bool (*)(int)>); |
| |
| // !is_object_v<Pred> |
| static_assert(!HasTakeWhileView<Range<int*>, Pred<int>&>); |
| |
| // !indirect_unary_predicate<const Pred, iterator_t<V>> |
| static_assert(!HasTakeWhileView<Range<int*>, int>); |
| static_assert(!HasTakeWhileView<Range<int**>, Pred<int>>); |