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//===----------------------------------------------------------------------===//
//
// 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>>);
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