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// -*- C++ -*-
//===------------------------------ span ---------------------------------===//
//
// 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++98, c++03, c++11, c++14, c++17
// <span>
// template <size_t _Ip, ElementType, size_t Extent>
// constexpr ElementType& get(span<ElementType, Extent> s) noexcept;
//
#include <span>
#include <cassert>
#include <string>
#include "test_macros.h"
template <size_t Idx, typename Span>
constexpr bool testConstexprSpan(Span sp, typename Span::pointer ptr)
{
ASSERT_NOEXCEPT(std::get<Idx>(sp));
return std::addressof(std::get<Idx>(sp)) == ptr;
}
template <size_t Idx, typename Span>
void testRuntimeSpan(Span sp, typename Span::pointer ptr)
{
ASSERT_NOEXCEPT(std::get<Idx>(sp));
assert(std::addressof(std::get<Idx>(sp)) == ptr);
}
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 size
static_assert(testConstexprSpan<0>(std::span<const int, 4>(iArr1, 1), iArr1 + 0), "");
static_assert(testConstexprSpan<1>(std::span<const int, 4>(iArr1, 2), iArr1 + 1), "");
static_assert(testConstexprSpan<2>(std::span<const int, 4>(iArr1, 3), iArr1 + 2), "");
static_assert(testConstexprSpan<3>(std::span<const int, 4>(iArr1, 4), iArr1 + 3), "");
static_assert(testConstexprSpan<0>(std::span<const int, 1>(iArr1 + 1, 1), iArr1 + 1), "");
static_assert(testConstexprSpan<1>(std::span<const int, 2>(iArr1 + 2, 2), iArr1 + 3), "");
static_assert(testConstexprSpan<2>(std::span<const int, 3>(iArr1 + 3, 3), iArr1 + 5), "");
static_assert(testConstexprSpan<3>(std::span<const int, 4>(iArr1 + 4, 4), iArr1 + 7), "");
// static size
testRuntimeSpan<0>(std::span<int, 4>(iArr2, 4), iArr2);
testRuntimeSpan<1>(std::span<int, 4>(iArr2, 1), iArr2 + 1);
testRuntimeSpan<2>(std::span<int, 4>(iArr2, 2), iArr2 + 2);
testRuntimeSpan<3>(std::span<int, 4>(iArr2, 3), iArr2 + 3);
testRuntimeSpan<0>(std::span<int, 4>(iArr2 + 1, 1), iArr2 + 1);
testRuntimeSpan<1>(std::span<int, 4>(iArr2 + 2, 2), iArr2 + 3);
testRuntimeSpan<2>(std::span<int, 4>(iArr2 + 3, 3), iArr2 + 5);
testRuntimeSpan<3>(std::span<int, 4>(iArr2 + 4, 4), iArr2 + 7);
std::string s;
testRuntimeSpan<0>(std::span<std::string, 1>(&s, 1), &s);
return 0;
}
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