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// -*- C++ -*-
//===------------------------------ span ---------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===---------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
// <span>
// template <class ElementType, ptrdiff_t Extent>
// span<byte,
// Extent == dynamic_extent
// ? dynamic_extent
// : static_cast<ptrdiff_t>(sizeof(ElementType)) * Extent>
// as_writeable_bytes(span<ElementType, Extent> s) noexcept;
#include <span>
#include <cassert>
#include <string>
#include "test_macros.h"
template<typename Span>
void testRuntimeSpan(Span sp)
{
ASSERT_NOEXCEPT(std::as_writeable_bytes(sp));
auto spBytes = std::as_writeable_bytes(sp);
using SB = decltype(spBytes);
ASSERT_SAME_TYPE(std::byte, typename SB::element_type);
if (sp.extent == std::dynamic_extent)
assert(spBytes.extent == std::dynamic_extent);
else
assert(spBytes.extent == static_cast<std::ptrdiff_t>(sizeof(typename Span::element_type)) * sp.extent);
assert(static_cast<void*>(spBytes.data()) == static_cast<void*>(sp.data()));
assert(spBytes.size() == sp.size_bytes());
}
struct A{};
int iArr2[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
int main ()
{
testRuntimeSpan(std::span<int> ());
testRuntimeSpan(std::span<long> ());
testRuntimeSpan(std::span<double> ());
testRuntimeSpan(std::span<A> ());
testRuntimeSpan(std::span<std::string>());
testRuntimeSpan(std::span<int, 0> ());
testRuntimeSpan(std::span<long, 0> ());
testRuntimeSpan(std::span<double, 0> ());
testRuntimeSpan(std::span<A, 0> ());
testRuntimeSpan(std::span<std::string, 0>());
testRuntimeSpan(std::span<int>(iArr2, 1));
testRuntimeSpan(std::span<int>(iArr2, 2));
testRuntimeSpan(std::span<int>(iArr2, 3));
testRuntimeSpan(std::span<int>(iArr2, 4));
testRuntimeSpan(std::span<int>(iArr2, 5));
testRuntimeSpan(std::span<int, 1>(iArr2 + 5, 1));
testRuntimeSpan(std::span<int, 2>(iArr2 + 4, 2));
testRuntimeSpan(std::span<int, 3>(iArr2 + 3, 3));
testRuntimeSpan(std::span<int, 4>(iArr2 + 2, 4));
testRuntimeSpan(std::span<int, 5>(iArr2 + 1, 5));
std::string s;
testRuntimeSpan(std::span<std::string>(&s, (std::ptrdiff_t) 0));
testRuntimeSpan(std::span<std::string>(&s, 1));
}
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