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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++03, c++11, c++14, c++17
// <span>
// constexpr pointer data() const noexcept;
//
#include <span>
#include <cassert>
#include <string>
#include "test_macros.h"
template <typename Span>
constexpr bool testConstexprSpan(Span sp, typename Span::pointer ptr)
{
ASSERT_NOEXCEPT(sp.data());
return sp.data() == ptr;
}
template <typename Span>
void testRuntimeSpan(Span sp, typename Span::pointer ptr)
{
ASSERT_NOEXCEPT(sp.data());
assert(sp.data() == 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**)
{
// dynamic size
static_assert(testConstexprSpan(std::span<int>(), nullptr), "");
static_assert(testConstexprSpan(std::span<long>(), nullptr), "");
static_assert(testConstexprSpan(std::span<double>(), nullptr), "");
static_assert(testConstexprSpan(std::span<A>(), nullptr), "");
static_assert(testConstexprSpan(std::span<std::string>(), nullptr), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 1), iArr1), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), iArr1), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), iArr1), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), iArr1), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1 + 1, 1), iArr1 + 1), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1 + 2, 2), iArr1 + 2), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1 + 3, 3), iArr1 + 3), "");
static_assert(testConstexprSpan(std::span<const int>(iArr1 + 4, 4), iArr1 + 4), "");
// static size
static_assert(testConstexprSpan(std::span<int, 0>(), nullptr), "");
static_assert(testConstexprSpan(std::span<long, 0>(), nullptr), "");
static_assert(testConstexprSpan(std::span<double, 0>(), nullptr), "");
static_assert(testConstexprSpan(std::span<A, 0>(), nullptr), "");
static_assert(testConstexprSpan(std::span<std::string, 0>(), nullptr), "");
static_assert(testConstexprSpan(std::span<const int, 1>(iArr1, 1), iArr1), "");
static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2), iArr1), "");
static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), iArr1), "");
static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), iArr1), "");
static_assert(testConstexprSpan(std::span<const int, 1>(iArr1 + 1, 1), iArr1 + 1), "");
static_assert(testConstexprSpan(std::span<const int, 2>(iArr1 + 2, 2), iArr1 + 2), "");
static_assert(testConstexprSpan(std::span<const int, 3>(iArr1 + 3, 3), iArr1 + 3), "");
static_assert(testConstexprSpan(std::span<const int, 4>(iArr1 + 4, 4), iArr1 + 4), "");
// dynamic size
testRuntimeSpan(std::span<int>(), nullptr);
testRuntimeSpan(std::span<long>(), nullptr);
testRuntimeSpan(std::span<double>(), nullptr);
testRuntimeSpan(std::span<A>(), nullptr);
testRuntimeSpan(std::span<std::string>(), nullptr);
testRuntimeSpan(std::span<int>(iArr2, 1), iArr2);
testRuntimeSpan(std::span<int>(iArr2, 2), iArr2);
testRuntimeSpan(std::span<int>(iArr2, 3), iArr2);
testRuntimeSpan(std::span<int>(iArr2, 4), iArr2);
testRuntimeSpan(std::span<int>(iArr2 + 1, 1), iArr2 + 1);
testRuntimeSpan(std::span<int>(iArr2 + 2, 2), iArr2 + 2);
testRuntimeSpan(std::span<int>(iArr2 + 3, 3), iArr2 + 3);
testRuntimeSpan(std::span<int>(iArr2 + 4, 4), iArr2 + 4);
// static size
testRuntimeSpan(std::span<int, 0>(), nullptr);
testRuntimeSpan(std::span<long, 0>(), nullptr);
testRuntimeSpan(std::span<double, 0>(), nullptr);
testRuntimeSpan(std::span<A, 0>(), nullptr);
testRuntimeSpan(std::span<std::string, 0>(), nullptr);
testRuntimeSpan(std::span<int, 1>(iArr2, 1), iArr2);
testRuntimeSpan(std::span<int, 2>(iArr2, 2), iArr2);
testRuntimeSpan(std::span<int, 3>(iArr2, 3), iArr2);
testRuntimeSpan(std::span<int, 4>(iArr2, 4), iArr2);
testRuntimeSpan(std::span<int, 1>(iArr2 + 1, 1), iArr2 + 1);
testRuntimeSpan(std::span<int, 2>(iArr2 + 2, 2), iArr2 + 2);
testRuntimeSpan(std::span<int, 3>(iArr2 + 3, 3), iArr2 + 3);
testRuntimeSpan(std::span<int, 4>(iArr2 + 4, 4), iArr2 + 4);
std::string s;
testRuntimeSpan(std::span<std::string>(&s, 1), &s);
testRuntimeSpan(std::span<std::string, 1>(&s, 1), &s);
return 0;
}
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