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 bool empty() const noexcept;
15 //
16
17
18 #include <span>
19 #include <cassert>
20 #include <string>
21
22 #include "test_macros.h"
23
24 struct A{};
25 constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
26 int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
27
main()28 int main ()
29 {
30 static_assert( noexcept(std::span<int> ().empty()), "");
31 static_assert( noexcept(std::span<int, 0>().empty()), "");
32
33
34 static_assert( std::span<int>().empty(), "");
35 static_assert( std::span<long>().empty(), "");
36 static_assert( std::span<double>().empty(), "");
37 static_assert( std::span<A>().empty(), "");
38 static_assert( std::span<std::string>().empty(), "");
39
40 static_assert( std::span<int, 0>().empty(), "");
41 static_assert( std::span<long, 0>().empty(), "");
42 static_assert( std::span<double, 0>().empty(), "");
43 static_assert( std::span<A, 0>().empty(), "");
44 static_assert( std::span<std::string, 0>().empty(), "");
45
46 static_assert(!std::span<const int>(iArr1, 1).empty(), "");
47 static_assert(!std::span<const int>(iArr1, 2).empty(), "");
48 static_assert(!std::span<const int>(iArr1, 3).empty(), "");
49 static_assert(!std::span<const int>(iArr1, 4).empty(), "");
50 static_assert(!std::span<const int>(iArr1, 5).empty(), "");
51
52 assert( (std::span<int>().empty() ));
53 assert( (std::span<long>().empty() ));
54 assert( (std::span<double>().empty() ));
55 assert( (std::span<A>().empty() ));
56 assert( (std::span<std::string>().empty() ));
57
58 assert( (std::span<int, 0>().empty() ));
59 assert( (std::span<long, 0>().empty() ));
60 assert( (std::span<double, 0>().empty() ));
61 assert( (std::span<A, 0>().empty() ));
62 assert( (std::span<std::string, 0>().empty()));
63
64 assert(!(std::span<int, 1>(iArr2, 1).empty()));
65 assert(!(std::span<int, 2>(iArr2, 2).empty()));
66 assert(!(std::span<int, 3>(iArr2, 3).empty()));
67 assert(!(std::span<int, 4>(iArr2, 4).empty()));
68 assert(!(std::span<int, 5>(iArr2, 5).empty()));
69
70 std::string s;
71 assert( ((std::span<std::string>(&s, (std::ptrdiff_t) 0)).empty()));
72 assert(!((std::span<std::string>(&s, 1).empty())));
73 }
74