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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>
// constexpr index_type size_bytes() const noexcept;
//
// Effects: Equivalent to: return size() * sizeof(element_type);
#include <span>
#include <cassert>
#include <string>
#include "test_macros.h"
template <typename Span>
constexpr bool testConstexprSpan(Span sp, ptrdiff_t sz)
{
ASSERT_NOEXCEPT(sp.size_bytes());
return (size_t) sp.size_bytes() == sz * sizeof(typename Span::element_type);
}
template <typename Span>
void testRuntimeSpan(Span sp, ptrdiff_t sz)
{
ASSERT_NOEXCEPT(sp.size_bytes());
assert((size_t) sp.size_bytes() == sz * sizeof(typename Span::element_type));
}
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 ()
{
static_assert(testConstexprSpan(std::span<int>(), 0), "");
static_assert(testConstexprSpan(std::span<long>(), 0), "");
static_assert(testConstexprSpan(std::span<double>(), 0), "");
static_assert(testConstexprSpan(std::span<A>(), 0), "");
static_assert(testConstexprSpan(std::span<std::string>(), 0), "");
static_assert(testConstexprSpan(std::span<int, 0>(), 0), "");
static_assert(testConstexprSpan(std::span<long, 0>(), 0), "");
static_assert(testConstexprSpan(std::span<double, 0>(), 0), "");
static_assert(testConstexprSpan(std::span<A, 0>(), 0), "");
static_assert(testConstexprSpan(std::span<std::string, 0>(), 0), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 1), 1), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), 2), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 3), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 4), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 5), 5), "");
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, 0> (), 0);
testRuntimeSpan(std::span<long, 0> (), 0);
testRuntimeSpan(std::span<double, 0> (), 0);
testRuntimeSpan(std::span<A, 0> (), 0);
testRuntimeSpan(std::span<std::string, 0>(), 0);
testRuntimeSpan(std::span<int>(iArr2, 1), 1);
testRuntimeSpan(std::span<int>(iArr2, 2), 2);
testRuntimeSpan(std::span<int>(iArr2, 3), 3);
testRuntimeSpan(std::span<int>(iArr2, 4), 4);
testRuntimeSpan(std::span<int>(iArr2, 5), 5);
testRuntimeSpan(std::span<int, 1>(iArr2 + 5, 1), 1);
testRuntimeSpan(std::span<int, 2>(iArr2 + 4, 2), 2);
testRuntimeSpan(std::span<int, 3>(iArr2 + 3, 3), 3);
testRuntimeSpan(std::span<int, 4>(iArr2 + 2, 4), 4);
testRuntimeSpan(std::span<int, 5>(iArr2 + 1, 5), 5);
std::string s;
testRuntimeSpan(std::span<std::string>(&s, (std::ptrdiff_t) 0), 0);
testRuntimeSpan(std::span<std::string>(&s, 1), 1);
}
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