1*594fa147SHui Xie //===----------------------------------------------------------------------===// 2*594fa147SHui Xie // 3*594fa147SHui Xie // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*594fa147SHui Xie // See https://llvm.org/LICENSE.txt for license information. 5*594fa147SHui Xie // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*594fa147SHui Xie // 7*594fa147SHui Xie //===----------------------------------------------------------------------===// 8*594fa147SHui Xie 9*594fa147SHui Xie // UNSUPPORTED: c++03, c++11, c++14, c++17 10*594fa147SHui Xie 11*594fa147SHui Xie // concept checking 12*594fa147SHui Xie // template<view V, class Pred> 13*594fa147SHui Xie // requires input_range<V> && is_object_v<Pred> && 14*594fa147SHui Xie // indirect_unary_predicate<const Pred, iterator_t<V>> 15*594fa147SHui Xie // class drop_while_view; 16*594fa147SHui Xie 17*594fa147SHui Xie #include <array> 18*594fa147SHui Xie #include <ranges> 19*594fa147SHui Xie 20*594fa147SHui Xie #include "test_iterators.h" 21*594fa147SHui Xie 22*594fa147SHui Xie template <class It> 23*594fa147SHui Xie using Range = std::ranges::subrange<It, sentinel_wrapper<It>>; 24*594fa147SHui Xie 25*594fa147SHui Xie template <class Val = int> 26*594fa147SHui Xie struct Pred { 27*594fa147SHui Xie bool operator()(const Val&) const; 28*594fa147SHui Xie }; 29*594fa147SHui Xie 30*594fa147SHui Xie template <class V, class Pred> 31*594fa147SHui Xie concept HasDropWhileView = requires { typename std::ranges::drop_while_view<V, Pred>; }; 32*594fa147SHui Xie 33*594fa147SHui Xie static_assert(HasDropWhileView<Range<int*>, bool (*)(int)>); 34*594fa147SHui Xie static_assert(HasDropWhileView<Range<int*>, Pred<int>>); 35*594fa147SHui Xie 36*594fa147SHui Xie // !view<V> 37*594fa147SHui Xie static_assert(!HasDropWhileView<std::array<int, 5>, Pred<int>>); 38*594fa147SHui Xie 39*594fa147SHui Xie // !input_range 40*594fa147SHui Xie static_assert(!HasDropWhileView<Range<cpp20_output_iterator<int*>>, bool (*)(int)>); 41*594fa147SHui Xie 42*594fa147SHui Xie // !is_object_v<Pred> 43*594fa147SHui Xie static_assert(!HasDropWhileView<Range<int*>, Pred<int>&>); 44*594fa147SHui Xie 45*594fa147SHui Xie // !indirect_unary_predicate<const Pred, iterator_t<V>> 46*594fa147SHui Xie static_assert(!HasDropWhileView<Range<int*>, int>); 47*594fa147SHui Xie static_assert(!HasDropWhileView<Range<int**>, Pred<int>>); 48