1 // -*- C++ -*-
2 //===------------------------------ span ---------------------------------===//
3 //
4 // The LLVM Compiler Infrastructure
5 //
6 // This file is dual licensed under the MIT and the University of Illinois Open
7 // Source Licenses. See LICENSE.TXT for details.
8 //
9 //===---------------------------------------------------------------------===//
10 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
11
12 // <span>
13
14 // constexpr index_type size_bytes() const noexcept;
15 //
16 // Effects: Equivalent to: return size() * sizeof(element_type);
17
18
19 #include <span>
20 #include <cassert>
21 #include <string>
22
23 #include "test_macros.h"
24
25
26 template <typename Span>
testConstexprSpan(Span sp,ptrdiff_t sz)27 constexpr bool testConstexprSpan(Span sp, ptrdiff_t sz)
28 {
29 ASSERT_NOEXCEPT(sp.size_bytes());
30 return (size_t) sp.size_bytes() == sz * sizeof(typename Span::element_type);
31 }
32
33
34 template <typename Span>
testRuntimeSpan(Span sp,ptrdiff_t sz)35 void testRuntimeSpan(Span sp, ptrdiff_t sz)
36 {
37 ASSERT_NOEXCEPT(sp.size_bytes());
38 assert((size_t) sp.size_bytes() == sz * sizeof(typename Span::element_type));
39 }
40
41 struct A{};
42 constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
43 int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
44
main()45 int main ()
46 {
47 static_assert(testConstexprSpan(std::span<int>(), 0), "");
48 static_assert(testConstexprSpan(std::span<long>(), 0), "");
49 static_assert(testConstexprSpan(std::span<double>(), 0), "");
50 static_assert(testConstexprSpan(std::span<A>(), 0), "");
51 static_assert(testConstexprSpan(std::span<std::string>(), 0), "");
52
53 static_assert(testConstexprSpan(std::span<int, 0>(), 0), "");
54 static_assert(testConstexprSpan(std::span<long, 0>(), 0), "");
55 static_assert(testConstexprSpan(std::span<double, 0>(), 0), "");
56 static_assert(testConstexprSpan(std::span<A, 0>(), 0), "");
57 static_assert(testConstexprSpan(std::span<std::string, 0>(), 0), "");
58
59 static_assert(testConstexprSpan(std::span<const int>(iArr1, 1), 1), "");
60 static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), 2), "");
61 static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 3), "");
62 static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 4), "");
63 static_assert(testConstexprSpan(std::span<const int>(iArr1, 5), 5), "");
64
65 testRuntimeSpan(std::span<int> (), 0);
66 testRuntimeSpan(std::span<long> (), 0);
67 testRuntimeSpan(std::span<double> (), 0);
68 testRuntimeSpan(std::span<A> (), 0);
69 testRuntimeSpan(std::span<std::string>(), 0);
70
71 testRuntimeSpan(std::span<int, 0> (), 0);
72 testRuntimeSpan(std::span<long, 0> (), 0);
73 testRuntimeSpan(std::span<double, 0> (), 0);
74 testRuntimeSpan(std::span<A, 0> (), 0);
75 testRuntimeSpan(std::span<std::string, 0>(), 0);
76
77 testRuntimeSpan(std::span<int>(iArr2, 1), 1);
78 testRuntimeSpan(std::span<int>(iArr2, 2), 2);
79 testRuntimeSpan(std::span<int>(iArr2, 3), 3);
80 testRuntimeSpan(std::span<int>(iArr2, 4), 4);
81 testRuntimeSpan(std::span<int>(iArr2, 5), 5);
82
83 testRuntimeSpan(std::span<int, 1>(iArr2 + 5, 1), 1);
84 testRuntimeSpan(std::span<int, 2>(iArr2 + 4, 2), 2);
85 testRuntimeSpan(std::span<int, 3>(iArr2 + 3, 3), 3);
86 testRuntimeSpan(std::span<int, 4>(iArr2 + 2, 4), 4);
87 testRuntimeSpan(std::span<int, 5>(iArr2 + 1, 5), 5);
88
89 std::string s;
90 testRuntimeSpan(std::span<std::string>(&s, (std::ptrdiff_t) 0), 0);
91 testRuntimeSpan(std::span<std::string>(&s, 1), 1);
92 }
93