112 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 pointer data() 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, typename Span::pointer ptr) {23 ASSERT_NOEXCEPT(sp.data());24 return sp.data() == ptr;25}26 27template <typename Span>28void testRuntimeSpan(Span sp, typename Span::pointer ptr) {29 ASSERT_NOEXCEPT(sp.data());30 assert(sp.data() == ptr);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 // dynamic size39 static_assert(testConstexprSpan(std::span<int>(), nullptr), "");40 static_assert(testConstexprSpan(std::span<long>(), nullptr), "");41 static_assert(testConstexprSpan(std::span<double>(), nullptr), "");42 static_assert(testConstexprSpan(std::span<A>(), nullptr), "");43 static_assert(testConstexprSpan(std::span<std::string>(), nullptr), "");44 45 static_assert(testConstexprSpan(std::span<const int>(iArr1, 1), iArr1), "");46 static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), iArr1), "");47 static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), iArr1), "");48 static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), iArr1), "");49 50 static_assert(testConstexprSpan(std::span<const int>(iArr1 + 1, 1), iArr1 + 1), "");51 static_assert(testConstexprSpan(std::span<const int>(iArr1 + 2, 2), iArr1 + 2), "");52 static_assert(testConstexprSpan(std::span<const int>(iArr1 + 3, 3), iArr1 + 3), "");53 static_assert(testConstexprSpan(std::span<const int>(iArr1 + 4, 4), iArr1 + 4), "");54 55 // static size56 static_assert(testConstexprSpan(std::span<int, 0>(), nullptr), "");57 static_assert(testConstexprSpan(std::span<long, 0>(), nullptr), "");58 static_assert(testConstexprSpan(std::span<double, 0>(), nullptr), "");59 static_assert(testConstexprSpan(std::span<A, 0>(), nullptr), "");60 static_assert(testConstexprSpan(std::span<std::string, 0>(), nullptr), "");61 62 static_assert(testConstexprSpan(std::span<const int, 1>(iArr1, 1), iArr1), "");63 static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2), iArr1), "");64 static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), iArr1), "");65 static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), iArr1), "");66 67 static_assert(testConstexprSpan(std::span<const int, 1>(iArr1 + 1, 1), iArr1 + 1), "");68 static_assert(testConstexprSpan(std::span<const int, 2>(iArr1 + 2, 2), iArr1 + 2), "");69 static_assert(testConstexprSpan(std::span<const int, 3>(iArr1 + 3, 3), iArr1 + 3), "");70 static_assert(testConstexprSpan(std::span<const int, 4>(iArr1 + 4, 4), iArr1 + 4), "");71 72 // dynamic size73 testRuntimeSpan(std::span<int>(), nullptr);74 testRuntimeSpan(std::span<long>(), nullptr);75 testRuntimeSpan(std::span<double>(), nullptr);76 testRuntimeSpan(std::span<A>(), nullptr);77 testRuntimeSpan(std::span<std::string>(), nullptr);78 79 testRuntimeSpan(std::span<int>(iArr2, 1), iArr2);80 testRuntimeSpan(std::span<int>(iArr2, 2), iArr2);81 testRuntimeSpan(std::span<int>(iArr2, 3), iArr2);82 testRuntimeSpan(std::span<int>(iArr2, 4), iArr2);83 84 testRuntimeSpan(std::span<int>(iArr2 + 1, 1), iArr2 + 1);85 testRuntimeSpan(std::span<int>(iArr2 + 2, 2), iArr2 + 2);86 testRuntimeSpan(std::span<int>(iArr2 + 3, 3), iArr2 + 3);87 testRuntimeSpan(std::span<int>(iArr2 + 4, 4), iArr2 + 4);88 89 // static size90 testRuntimeSpan(std::span<int, 0>(), nullptr);91 testRuntimeSpan(std::span<long, 0>(), nullptr);92 testRuntimeSpan(std::span<double, 0>(), nullptr);93 testRuntimeSpan(std::span<A, 0>(), nullptr);94 testRuntimeSpan(std::span<std::string, 0>(), nullptr);95 96 testRuntimeSpan(std::span<int, 1>(iArr2, 1), iArr2);97 testRuntimeSpan(std::span<int, 2>(iArr2, 2), iArr2);98 testRuntimeSpan(std::span<int, 3>(iArr2, 3), iArr2);99 testRuntimeSpan(std::span<int, 4>(iArr2, 4), iArr2);100 101 testRuntimeSpan(std::span<int, 1>(iArr2 + 1, 1), iArr2 + 1);102 testRuntimeSpan(std::span<int, 2>(iArr2 + 2, 2), iArr2 + 2);103 testRuntimeSpan(std::span<int, 3>(iArr2 + 3, 3), iArr2 + 3);104 testRuntimeSpan(std::span<int, 4>(iArr2 + 4, 4), iArr2 + 4);105 106 std::string s;107 testRuntimeSpan(std::span<std::string>(&s, 1), &s);108 testRuntimeSpan(std::span<std::string, 1>(&s, 1), &s);109 110 return 0;111}112