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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 sentinel_t<Base> base() const;
#include <cassert>
#include <ranges>
#include <tuple>
#include <type_traits>
#include <utility>
struct Sent {
int i;
friend constexpr bool operator==(std::tuple<int>*, const Sent&) { return true; }
};
constexpr bool test() {
using BaseRange = std::ranges::subrange<std::tuple<int>*, Sent>;
using EleRange = std::ranges::elements_view<BaseRange, 0>;
using EleSent = std::ranges::sentinel_t<EleRange>;
const EleSent st{Sent{5}};
std::same_as<Sent> decltype(auto) base = st.base();
assert(base.i == 5);
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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