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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
// <span>
// [[nodiscard]] constexpr bool empty() const noexcept;
//
#include <span>
#include <cassert>
#include <string>
#include "test_macros.h"
struct A{};
constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
int main(int, char**)
{
static_assert( noexcept(std::span<int> ().empty()), "");
static_assert( noexcept(std::span<int, 0>().empty()), "");
static_assert( std::span<int>().empty(), "");
static_assert( std::span<long>().empty(), "");
static_assert( std::span<double>().empty(), "");
static_assert( std::span<A>().empty(), "");
static_assert( std::span<std::string>().empty(), "");
static_assert( std::span<int, 0>().empty(), "");
static_assert( std::span<long, 0>().empty(), "");
static_assert( std::span<double, 0>().empty(), "");
static_assert( std::span<A, 0>().empty(), "");
static_assert( std::span<std::string, 0>().empty(), "");
static_assert(!std::span<const int>(iArr1, 1).empty(), "");
static_assert(!std::span<const int>(iArr1, 2).empty(), "");
static_assert(!std::span<const int>(iArr1, 3).empty(), "");
static_assert(!std::span<const int>(iArr1, 4).empty(), "");
static_assert(!std::span<const int>(iArr1, 5).empty(), "");
assert( (std::span<int>().empty() ));
assert( (std::span<long>().empty() ));
assert( (std::span<double>().empty() ));
assert( (std::span<A>().empty() ));
assert( (std::span<std::string>().empty() ));
assert( (std::span<int, 0>().empty() ));
assert( (std::span<long, 0>().empty() ));
assert( (std::span<double, 0>().empty() ));
assert( (std::span<A, 0>().empty() ));
assert( (std::span<std::string, 0>().empty()));
assert(!(std::span<int, 1>(iArr2, 1).empty()));
assert(!(std::span<int, 2>(iArr2, 2).empty()));
assert(!(std::span<int, 3>(iArr2, 3).empty()));
assert(!(std::span<int, 4>(iArr2, 4).empty()));
assert(!(std::span<int, 5>(iArr2, 5).empty()));
std::string s;
assert( ((std::span<std::string>(&s, (std::size_t) 0)).empty()));
assert(!((std::span<std::string>(&s, 1).empty())));
return 0;
}
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