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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
// template<viewable_range R>
// using all_t = decltype(views::all(declval<R>()));
#include <ranges>
#include "test_iterators.h"
struct View : std::ranges::view_base {
int *begin() const;
int *end() const;
};
struct Range {
int *begin() const;
int *end() const;
};
struct BorrowableRange {
int *begin() const;
int *end() const;
};
template<>
inline constexpr bool std::ranges::enable_borrowed_range<BorrowableRange> = true;
template <class T>
concept HasAllT = requires {
typename std::views::all_t<T>;
};
// When T is a view, returns decay-copy(T)
ASSERT_SAME_TYPE(std::views::all_t<View>, View);
ASSERT_SAME_TYPE(std::views::all_t<View&>, View);
ASSERT_SAME_TYPE(std::views::all_t<View&&>, View);
ASSERT_SAME_TYPE(std::views::all_t<const View>, View);
ASSERT_SAME_TYPE(std::views::all_t<const View&>, View);
ASSERT_SAME_TYPE(std::views::all_t<const View&&>, View);
// Otherwise, when T is a reference to a range, returns ref_view<T>
ASSERT_SAME_TYPE(std::views::all_t<Range&>, std::ranges::ref_view<Range>);
ASSERT_SAME_TYPE(std::views::all_t<const Range&>, std::ranges::ref_view<const Range>);
ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange&>, std::ranges::ref_view<BorrowableRange>);
ASSERT_SAME_TYPE(std::views::all_t<const BorrowableRange&>, std::ranges::ref_view<const BorrowableRange>);
// Otherwise, returns owning_view<T>
ASSERT_SAME_TYPE(std::views::all_t<Range>, std::ranges::owning_view<Range>);
ASSERT_SAME_TYPE(std::views::all_t<Range&&>, std::ranges::owning_view<Range>);
static_assert(!HasAllT<const Range>);
static_assert(!HasAllT<const Range&&>);
ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange>, std::ranges::owning_view<BorrowableRange>);
ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange&&>, std::ranges::owning_view<BorrowableRange>);
static_assert(!HasAllT<const BorrowableRange>);
static_assert(!HasAllT<const BorrowableRange&&>);
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