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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-has-no-incomplete-ranges
// constexpr T* begin() noexcept;
// constexpr const T* begin() const noexcept;
#include <ranges>
#include <cassert>
#include "test_macros.h"
struct Empty {};
struct BigType { char buffer[64] = {10}; };
constexpr bool test() {
{
auto sv = std::ranges::single_view<int>(42);
assert(*sv.begin() == 42);
ASSERT_SAME_TYPE(decltype(sv.begin()), int*);
static_assert(noexcept(sv.begin()));
}
{
const auto sv = std::ranges::single_view<int>(42);
assert(*sv.begin() == 42);
ASSERT_SAME_TYPE(decltype(sv.begin()), const int*);
static_assert(noexcept(sv.begin()));
}
{
auto sv = std::ranges::single_view<Empty>(Empty());
assert(sv.begin() != nullptr);
ASSERT_SAME_TYPE(decltype(sv.begin()), Empty*);
}
{
const auto sv = std::ranges::single_view<Empty>(Empty());
assert(sv.begin() != nullptr);
ASSERT_SAME_TYPE(decltype(sv.begin()), const Empty*);
}
{
auto sv = std::ranges::single_view<BigType>(BigType());
assert(sv.begin()->buffer[0] == 10);
ASSERT_SAME_TYPE(decltype(sv.begin()), BigType*);
}
{
const auto sv = std::ranges::single_view<BigType>(BigType());
assert(sv.begin()->buffer[0] == 10);
ASSERT_SAME_TYPE(decltype(sv.begin()), const BigType*);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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