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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // UNSUPPORTED: c++03, c++11, c++14, c++17 9 10 // <span> 11 12 // template <class ElementType, size_t Extent> 13 // span<const byte, 14 // Extent == dynamic_extent 15 // ? dynamic_extent 16 // : sizeof(ElementType) * Extent> 17 // as_bytes(span<ElementType, Extent> s) noexcept; 18 19 #include <cassert> 20 #include <cstddef> 21 #include <span> 22 #include <string> 23 24 #include "test_macros.h" 25 26 template<typename Span> 27 void testRuntimeSpan(Span sp) 28 { 29 ASSERT_NOEXCEPT(std::as_bytes(sp)); 30 31 auto spBytes = std::as_bytes(sp); 32 using SB = decltype(spBytes); 33 ASSERT_SAME_TYPE(const std::byte, typename SB::element_type); 34 35 if constexpr (sp.extent == std::dynamic_extent) 36 assert(spBytes.extent == std::dynamic_extent); 37 else 38 assert(spBytes.extent == sizeof(typename Span::element_type) * sp.extent); 39 40 assert((void *) spBytes.data() == (void *) sp.data()); 41 assert(spBytes.size() == sp.size_bytes()); 42 } 43 44 struct A{}; 45 int iArr2[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; 46 47 int main(int, char**) 48 { 49 testRuntimeSpan(std::span<int> ()); 50 testRuntimeSpan(std::span<long> ()); 51 testRuntimeSpan(std::span<double> ()); 52 testRuntimeSpan(std::span<A> ()); 53 testRuntimeSpan(std::span<std::string>()); 54 55 testRuntimeSpan(std::span<int, 0> ()); 56 testRuntimeSpan(std::span<long, 0> ()); 57 testRuntimeSpan(std::span<double, 0> ()); 58 testRuntimeSpan(std::span<A, 0> ()); 59 testRuntimeSpan(std::span<std::string, 0>()); 60 61 testRuntimeSpan(std::span<int>(iArr2, 1)); 62 testRuntimeSpan(std::span<int>(iArr2, 2)); 63 testRuntimeSpan(std::span<int>(iArr2, 3)); 64 testRuntimeSpan(std::span<int>(iArr2, 4)); 65 testRuntimeSpan(std::span<int>(iArr2, 5)); 66 67 testRuntimeSpan(std::span<int, 1>(iArr2 + 5, 1)); 68 testRuntimeSpan(std::span<int, 2>(iArr2 + 4, 2)); 69 testRuntimeSpan(std::span<int, 3>(iArr2 + 3, 3)); 70 testRuntimeSpan(std::span<int, 4>(iArr2 + 2, 4)); 71 testRuntimeSpan(std::span<int, 5>(iArr2 + 1, 5)); 72 73 std::string s; 74 testRuntimeSpan(std::span<std::string>(&s, (std::size_t) 0)); 75 testRuntimeSpan(std::span<std::string>(&s, 1)); 76 77 return 0; 78 } 79