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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(const span& other) noexcept = default;
#include <span>
#include <cassert>
#include <string>
#include <utility>
#include "test_macros.h"
template <class T>
constexpr void test() {
ASSERT_NOEXCEPT(std::span<T>(std::declval<std::span<T> const&>()));
ASSERT_NOEXCEPT(std::span<T>{std::declval<std::span<T> const&>()});
// dynamic_extent
{
std::span<T> x;
std::span<T> copy(x);
assert(copy.data() == x.data());
assert(copy.size() == x.size());
}
{
T array[3] = {};
std::span<T> x(array, 3);
std::span<T> copy(x);
assert(copy.data() == array);
assert(copy.size() == 3);
}
{
T array[3] = {};
std::span<T> x(array, 2);
std::span<T> copy(x);
assert(copy.data() == array);
assert(copy.size() == 2);
}
// static extent
{
std::span<T, 0> x;
std::span<T, 0> copy(x);
assert(copy.data() == x.data());
assert(copy.size() == x.size());
}
{
T array[3] = {};
std::span<T, 3> x(array);
std::span<T, 3> copy(x);
assert(copy.data() == array);
assert(copy.size() == 3);
}
{
T array[2] = {};
std::span<T, 2> x(array);
std::span<T, 2> copy(x);
assert(copy.data() == array);
assert(copy.size() == 2);
}
}
struct Foo {};
constexpr bool test_all() {
test<int>();
test<const int>();
test<volatile int>();
test<const volatile int>();
test<long>();
test<const long>();
test<volatile long>();
test<const volatile long>();
test<double>();
test<const double>();
test<volatile double>();
test<const volatile double>();
// Note: Can't test non-fundamental types with volatile because we require `T*` to be indirectly_readable,
// which isn't the case when T is volatile.
test<Foo>();
test<const Foo>();
test<std::string>();
test<const std::string>();
// Regression test for https://github.com/llvm/llvm-project/issues/104496
{
struct Incomplete;
std::span<Incomplete> x;
std::span<Incomplete> copy(x);
assert(copy.data() == x.data());
assert(copy.size() == x.size());
}
return true;
}
int main(int, char**) {
test_all();
static_assert(test_all());
return 0;
}
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