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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 reference operator[](index_type idx) const;
// constexpr reference operator()(index_type idx) const;
//
#include <span>
#include <cassert>
#include <string>
#include "test_macros.h"
template <typename Span>
constexpr bool testConstexprSpan(Span sp, ptrdiff_t idx)
{
_LIBCPP_ASSERT(noexcept(sp[idx]), "");
_LIBCPP_ASSERT(noexcept(sp(idx)), "");
typename Span::reference r1 = sp[idx];
typename Span::reference r2 = sp(idx);
typename Span::reference r3 = *(sp.data() + idx);
return r1 == r2 && r2 == r3;
}
template <typename Span>
void testRuntimeSpan(Span sp, ptrdiff_t idx)
{
_LIBCPP_ASSERT(noexcept(sp[idx]), "");
_LIBCPP_ASSERT(noexcept(sp(idx)), "");
typename Span::reference r1 = sp[idx];
typename Span::reference r2 = sp(idx);
typename Span::reference r3 = *(sp.data() + idx);
assert(r1 == r2 && r2 == r3);
}
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<const int>(iArr1, 1), 0), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), 0), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), 1), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 0), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 1), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 2), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 0), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 1), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 2), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 3), "");
static_assert(testConstexprSpan(std::span<const int, 1>(iArr1, 1), 0), "");
static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2), 0), "");
static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2), 1), "");
static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 0), "");
static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 1), "");
static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 2), "");
static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 0), "");
static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 1), "");
static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 2), "");
static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 3), "");
testRuntimeSpan(std::span<int>(iArr2, 1), 0);
testRuntimeSpan(std::span<int>(iArr2, 2), 0);
testRuntimeSpan(std::span<int>(iArr2, 2), 1);
testRuntimeSpan(std::span<int>(iArr2, 3), 0);
testRuntimeSpan(std::span<int>(iArr2, 3), 1);
testRuntimeSpan(std::span<int>(iArr2, 3), 2);
testRuntimeSpan(std::span<int>(iArr2, 4), 0);
testRuntimeSpan(std::span<int>(iArr2, 4), 1);
testRuntimeSpan(std::span<int>(iArr2, 4), 2);
testRuntimeSpan(std::span<int>(iArr2, 4), 3);
testRuntimeSpan(std::span<int, 1>(iArr2, 1), 0);
testRuntimeSpan(std::span<int, 2>(iArr2, 2), 0);
testRuntimeSpan(std::span<int, 2>(iArr2, 2), 1);
testRuntimeSpan(std::span<int, 3>(iArr2, 3), 0);
testRuntimeSpan(std::span<int, 3>(iArr2, 3), 1);
testRuntimeSpan(std::span<int, 3>(iArr2, 3), 2);
testRuntimeSpan(std::span<int, 4>(iArr2, 4), 0);
testRuntimeSpan(std::span<int, 4>(iArr2, 4), 1);
testRuntimeSpan(std::span<int, 4>(iArr2, 4), 2);
testRuntimeSpan(std::span<int, 4>(iArr2, 4), 3);
std::string s;
testRuntimeSpan(std::span<std::string> (&s, 1), 0);
testRuntimeSpan(std::span<std::string, 1>(&s, 1), 0);
}
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