86 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8// UNSUPPORTED: c++03, c++11, c++14, c++179 10// <span>11 12// constexpr size_type size() const noexcept;13//14 15#include <span>16#include <cassert>17#include <string>18 19#include "test_macros.h"20 21template <typename Span>22constexpr bool testConstexprSpan(Span sp, std::size_t sz) {23 ASSERT_NOEXCEPT(sp.size());24 return sp.size() == sz;25}26 27template <typename Span>28void testRuntimeSpan(Span sp, std::size_t sz) {29 ASSERT_NOEXCEPT(sp.size());30 assert(sp.size() == sz);31}32 33struct A {};34constexpr int iArr1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};35int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};36 37int main(int, char**) {38 static_assert(testConstexprSpan(std::span<int>(), 0), "");39 static_assert(testConstexprSpan(std::span<long>(), 0), "");40 static_assert(testConstexprSpan(std::span<double>(), 0), "");41 static_assert(testConstexprSpan(std::span<A>(), 0), "");42 static_assert(testConstexprSpan(std::span<std::string>(), 0), "");43 44 static_assert(testConstexprSpan(std::span<int, 0>(), 0), "");45 static_assert(testConstexprSpan(std::span<long, 0>(), 0), "");46 static_assert(testConstexprSpan(std::span<double, 0>(), 0), "");47 static_assert(testConstexprSpan(std::span<A, 0>(), 0), "");48 static_assert(testConstexprSpan(std::span<std::string, 0>(), 0), "");49 50 static_assert(testConstexprSpan(std::span<const int>(iArr1, 1), 1), "");51 static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), 2), "");52 static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 3), "");53 static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 4), "");54 static_assert(testConstexprSpan(std::span<const int>(iArr1, 5), 5), "");55 56 testRuntimeSpan(std::span<int>(), 0);57 testRuntimeSpan(std::span<long>(), 0);58 testRuntimeSpan(std::span<double>(), 0);59 testRuntimeSpan(std::span<A>(), 0);60 testRuntimeSpan(std::span<std::string>(), 0);61 62 testRuntimeSpan(std::span<int, 0>(), 0);63 testRuntimeSpan(std::span<long, 0>(), 0);64 testRuntimeSpan(std::span<double, 0>(), 0);65 testRuntimeSpan(std::span<A, 0>(), 0);66 testRuntimeSpan(std::span<std::string, 0>(), 0);67 68 testRuntimeSpan(std::span<int>(iArr2, 1), 1);69 testRuntimeSpan(std::span<int>(iArr2, 2), 2);70 testRuntimeSpan(std::span<int>(iArr2, 3), 3);71 testRuntimeSpan(std::span<int>(iArr2, 4), 4);72 testRuntimeSpan(std::span<int>(iArr2, 5), 5);73 74 testRuntimeSpan(std::span<int, 1>(iArr2 + 5, 1), 1);75 testRuntimeSpan(std::span<int, 2>(iArr2 + 4, 2), 2);76 testRuntimeSpan(std::span<int, 3>(iArr2 + 3, 3), 3);77 testRuntimeSpan(std::span<int, 4>(iArr2 + 2, 4), 4);78 testRuntimeSpan(std::span<int, 5>(iArr2 + 1, 5), 5);79 80 std::string s;81 testRuntimeSpan(std::span<std::string>(&s, (std::size_t)0), 0);82 testRuntimeSpan(std::span<std::string>(&s, 1), 1);83 84 return 0;85}86