1 // -*- C++ -*-
2 //===------------------------------ span ---------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===---------------------------------------------------------------------===//
9 // UNSUPPORTED: c++03, c++11, c++14, c++17
10
11 // <span>
12
13 // template <class ElementType, size_t Extent>
14 // span<const byte,
15 // Extent == dynamic_extent
16 // ? dynamic_extent
17 // : sizeof(ElementType) * Extent>
18 // as_bytes(span<ElementType, Extent> s) noexcept;
19
20
21 #include <span>
22 #include <cassert>
23 #include <string>
24
25 #include "test_macros.h"
26
27 template<typename Span>
testRuntimeSpan(Span sp)28 void testRuntimeSpan(Span sp)
29 {
30 ASSERT_NOEXCEPT(std::as_bytes(sp));
31
32 auto spBytes = std::as_bytes(sp);
33 using SB = decltype(spBytes);
34 ASSERT_SAME_TYPE(const std::byte, typename SB::element_type);
35
36 if constexpr (sp.extent == std::dynamic_extent)
37 assert(spBytes.extent == std::dynamic_extent);
38 else
39 assert(spBytes.extent == sizeof(typename Span::element_type) * sp.extent);
40
41 assert((void *) spBytes.data() == (void *) sp.data());
42 assert(spBytes.size() == sp.size_bytes());
43 }
44
45 struct A{};
46 int iArr2[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
47
main(int,char **)48 int main(int, char**)
49 {
50 testRuntimeSpan(std::span<int> ());
51 testRuntimeSpan(std::span<long> ());
52 testRuntimeSpan(std::span<double> ());
53 testRuntimeSpan(std::span<A> ());
54 testRuntimeSpan(std::span<std::string>());
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>(iArr2, 1));
63 testRuntimeSpan(std::span<int>(iArr2, 2));
64 testRuntimeSpan(std::span<int>(iArr2, 3));
65 testRuntimeSpan(std::span<int>(iArr2, 4));
66 testRuntimeSpan(std::span<int>(iArr2, 5));
67
68 testRuntimeSpan(std::span<int, 1>(iArr2 + 5, 1));
69 testRuntimeSpan(std::span<int, 2>(iArr2 + 4, 2));
70 testRuntimeSpan(std::span<int, 3>(iArr2 + 3, 3));
71 testRuntimeSpan(std::span<int, 4>(iArr2 + 2, 4));
72 testRuntimeSpan(std::span<int, 5>(iArr2 + 1, 5));
73
74 std::string s;
75 testRuntimeSpan(std::span<std::string>(&s, (std::size_t) 0));
76 testRuntimeSpan(std::span<std::string>(&s, 1));
77
78 return 0;
79 }
80