op_idx.pass.cpp
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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>
// constexpr reference operator[](size_type idx) const;
// constexpr reference operator()(size_type idx) const;
//
#include <span>
#include <cassert>
#include <string>
#include "test_macros.h"
template <typename Span>
constexpr bool testConstexprSpan(Span sp, size_t idx)
{
LIBCPP_ASSERT(noexcept(sp[idx]));
typename Span::reference r1 = sp[idx];
typename Span::reference r2 = *(sp.data() + idx);
return r1 == r2;
}
template <typename Span>
void testRuntimeSpan(Span sp, size_t idx)
{
LIBCPP_ASSERT(noexcept(sp[idx]));
typename Span::reference r1 = sp[idx];
typename Span::reference r2 = *(sp.data() + idx);
assert(r1 == r2);
}
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_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);
return 0;
}