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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
// UNSUPPORTED: libcpp-no-concepts
// UNSUPPORTED: gcc-10
// UNSUPPORTED: libcpp-has-no-incomplete-ranges
// std::views::all;
#include <ranges>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
int globalBuff[8];
template<bool IsNoexcept>
struct View : std::ranges::view_base {
int start_ = 0;
explicit View() noexcept(IsNoexcept) = default;
constexpr explicit View(int start) : start_(start) {}
View(View&&) noexcept(IsNoexcept) = default;
View& operator=(View&&) noexcept(IsNoexcept) = default;
friend constexpr int* begin(View& view) { return globalBuff + view.start_; }
friend constexpr int* begin(View const& view) { return globalBuff + view.start_; }
friend constexpr int* end(View&) { return globalBuff + 8; }
friend constexpr int* end(View const&) { return globalBuff + 8; }
};
static_assert(std::ranges::view<View<true>>);
static_assert(std::ranges::view<View<false>>);
template<bool IsNoexcept>
struct CopyableView : std::ranges::view_base {
int start_ = 0;
explicit CopyableView() noexcept(IsNoexcept) = default;
CopyableView(CopyableView const&) noexcept(IsNoexcept) = default;
CopyableView& operator=(CopyableView const&) noexcept(IsNoexcept) = default;
constexpr explicit CopyableView(int start) noexcept : start_(start) {}
friend constexpr int* begin(CopyableView& view) { return globalBuff + view.start_; }
friend constexpr int* begin(CopyableView const& view) { return globalBuff + view.start_; }
friend constexpr int* end(CopyableView&) { return globalBuff + 8; }
friend constexpr int* end(CopyableView const&) { return globalBuff + 8; }
};
static_assert(std::ranges::view<CopyableView<true>>);
static_assert(std::ranges::view<CopyableView<false>>);
struct Range {
int start_;
constexpr explicit Range(int start) noexcept : start_(start) {}
friend constexpr int* begin(Range const& range) { return globalBuff + range.start_; }
friend constexpr int* begin(Range& range) { return globalBuff + range.start_; }
friend constexpr int* end(Range const&) { return globalBuff + 8; }
friend constexpr int* end(Range&) { return globalBuff + 8; }
};
struct BorrowableRange {
int start_;
constexpr explicit BorrowableRange(int start) noexcept : start_(start) {}
friend constexpr int* begin(BorrowableRange const& range) { return globalBuff + range.start_; }
friend constexpr int* begin(BorrowableRange& range) { return globalBuff + range.start_; }
friend constexpr int* end(BorrowableRange const&) { return globalBuff + 8; }
friend constexpr int* end(BorrowableRange&) { return globalBuff + 8; }
};
template<>
inline constexpr bool std::ranges::enable_borrowed_range<BorrowableRange> = true;
struct RandomAccessRange {
struct sentinel {
friend constexpr bool operator==(sentinel, const random_access_iterator<int*> rai) { return rai.base() == globalBuff + 8; }
friend constexpr std::ptrdiff_t operator-(sentinel, random_access_iterator<int*>) { return -8; }
friend constexpr std::ptrdiff_t operator-(random_access_iterator<int*>, sentinel) { return 8; }
};
constexpr random_access_iterator<int*> begin() { return random_access_iterator<int*>{globalBuff}; }
constexpr sentinel end() { return {}; }
};
template<>
inline constexpr bool std::ranges::enable_borrowed_range<RandomAccessRange> = true;
constexpr bool test() {
{
ASSERT_SAME_TYPE(decltype(std::views::all(View<true>())), View<true>);
static_assert(noexcept(std::views::all(View<true>())));
static_assert(!noexcept(std::views::all(View<false>())));
auto viewCopy = std::views::all(View<true>(2));
ASSERT_SAME_TYPE(decltype(viewCopy), View<true>);
assert(std::ranges::begin(viewCopy) == globalBuff + 2);
assert(std::ranges::end(viewCopy) == globalBuff + 8);
}
{
ASSERT_SAME_TYPE(decltype(std::views::all(std::declval<const CopyableView<true>&>())), CopyableView<true>);
static_assert(noexcept(std::views::all(CopyableView<true>())));
static_assert(!noexcept(std::views::all(CopyableView<false>())));
CopyableView<true> view(2);
auto viewCopy = std::views::all(view);
ASSERT_SAME_TYPE(decltype(viewCopy), CopyableView<true>);
assert(std::ranges::begin(viewCopy) == globalBuff + 2);
assert(std::ranges::end(viewCopy) == globalBuff + 8);
}
{
Range range(2);
auto ref = std::views::all(range);
ASSERT_SAME_TYPE(decltype(ref), std::ranges::ref_view<Range>);
assert(std::ranges::begin(ref) == globalBuff + 2);
assert(std::ranges::end(ref) == globalBuff + 8);
static_assert(!std::is_invocable_v<decltype(std::views::all), Range>);
}
{
const Range range(2);
auto ref = std::views::all(range);
static_assert(!noexcept(std::views::all(range)));
ASSERT_SAME_TYPE(decltype(ref), std::ranges::ref_view<const Range>);
assert(std::ranges::begin(ref) == globalBuff + 2);
assert(std::ranges::end(ref) == globalBuff + 8);
}
{
auto subrange = std::views::all(BorrowableRange(2));
static_assert(!noexcept(std::views::all(BorrowableRange(2))));
ASSERT_SAME_TYPE(decltype(subrange), std::ranges::subrange<int*>);
assert(std::ranges::begin(subrange) == globalBuff + 2);
assert(std::ranges::end(subrange) == globalBuff + 8);
}
{
auto subrange = std::views::all(RandomAccessRange());
ASSERT_SAME_TYPE(decltype(subrange),
std::ranges::subrange<random_access_iterator<int*>, RandomAccessRange::sentinel>);
assert(std::ranges::begin(subrange).base() == globalBuff);
assert(std::ranges::end(subrange) == std::ranges::begin(subrange) + 8);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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