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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
// constexpr auto size() requires sized_range<V>
// constexpr auto size() const requires sized_range<const V>
#include <ranges>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#include "test_range.h"
#include "types.h"
template<class T>
concept SizeEnabled = requires(const std::ranges::take_view<T>& tv) {
tv.size();
};
constexpr bool test() {
int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
{
static_assert( SizeEnabled<SizedRandomAccessView>);
static_assert(!SizeEnabled<CopyableView>);
}
{
std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 0);
assert(tv.size() == 0);
}
{
const std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 2);
assert(tv.size() == 2);
}
{
std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 4);
assert(tv.size() == 4);
}
{
const std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 6);
assert(tv.size() == 6);
}
{
std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 8);
assert(tv.size() == 8);
}
{
const std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 8);
assert(tv.size() == 8);
}
{
std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 10);
assert(tv.size() == 8);
}
{
const std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 10);
assert(tv.size() == 8);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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