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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>
// constexpr span() noexcept;
#include <span>
#include <cassert>
#include <string>
#include <type_traits>
#include "test_macros.h"
void checkCV()
{
// Types the same (dynamic sized)
{
std::span< int> s1;
std::span<const int> s2;
std::span< volatile int> s3;
std::span<const volatile int> s4;
assert(s1.size() + s2.size() + s3.size() + s4.size() == 0);
}
// Types the same (static sized)
{
std::span< int,0> s1;
std::span<const int,0> s2;
std::span< volatile int,0> s3;
std::span<const volatile int,0> s4;
assert(s1.size() + s2.size() + s3.size() + s4.size() == 0);
}
}
template <typename T>
constexpr bool testConstexprSpan()
{
std::span<const T> s1;
std::span<const T, 0> s2;
return
s1.data() == nullptr && s1.size() == 0
&& s2.data() == nullptr && s2.size() == 0;
}
template <typename T>
void testRuntimeSpan()
{
ASSERT_NOEXCEPT(T{});
std::span<const T> s1;
std::span<const T, 0> s2;
assert(s1.data() == nullptr && s1.size() == 0);
assert(s2.data() == nullptr && s2.size() == 0);
}
struct A{};
int main(int, char**)
{
static_assert(testConstexprSpan<int>(), "");
static_assert(testConstexprSpan<long>(), "");
static_assert(testConstexprSpan<double>(), "");
static_assert(testConstexprSpan<A>(), "");
testRuntimeSpan<int>();
testRuntimeSpan<long>();
testRuntimeSpan<double>();
testRuntimeSpan<std::string>();
testRuntimeSpan<A>();
checkCV();
static_assert( std::is_default_constructible_v<std::span<int, std::dynamic_extent>>, "");
static_assert( std::is_default_constructible_v<std::span<int, 0>>, "");
static_assert(!std::is_default_constructible_v<std::span<int, 2>>, "");
return 0;
}
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