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// constexpr iterator end() const noexcept;
13// constexpr const_iterator cend() const noexcept;
14
15#include <span>
16#include <cassert>
17#include <string>
18
19#include "test_macros.h"
20
21template <class Span>
22constexpr bool testConstexprSpan(Span s) {
23 bool ret = true;
24 typename Span::iterator e = s.end();
25 if (s.empty()) {
26 ret = ret && (e == s.begin());
27 } else {
28 typename Span::const_pointer last = &*(s.begin() + s.size() - 1);
29 ret = ret && (e != s.begin());
30 ret = ret && (&*(e - 1) == last);
31 }
32
33 ret = ret && (static_cast<std::size_t>(e - s.begin()) == s.size());
34 return ret;
35}
36
37template <class Span>
38void testRuntimeSpan(Span s) {
39 typename Span::iterator e = s.end();
40 if (s.empty()) {
41 assert(e == s.begin());
42 } else {
43 typename Span::const_pointer last = &*(s.begin() + s.size() - 1);
44 assert(e != s.begin());
45 assert(&*(e - 1) == last);
46 }
47
48 assert(static_cast<std::size_t>(e - s.begin()) == s.size());
49}
50
51struct A {};
52bool operator==(A, A) { return true; }
53
54constexpr int iArr1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
55int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
56
57int main(int, char**) {
58 static_assert(testConstexprSpan(std::span<int>()), "");
59 static_assert(testConstexprSpan(std::span<long>()), "");
60 static_assert(testConstexprSpan(std::span<double>()), "");
61 static_assert(testConstexprSpan(std::span<A>()), "");
62 static_assert(testConstexprSpan(std::span<std::string>()), "");
63
64 static_assert(testConstexprSpan(std::span<int, 0>()), "");
65 static_assert(testConstexprSpan(std::span<long, 0>()), "");
66 static_assert(testConstexprSpan(std::span<double, 0>()), "");
67 static_assert(testConstexprSpan(std::span<A, 0>()), "");
68 static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
69
70 static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)), "");
71 static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)), "");
72 static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)), "");
73 static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)), "");
74 static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)), "");
75
76 testRuntimeSpan(std::span<int>());
77 testRuntimeSpan(std::span<long>());
78 testRuntimeSpan(std::span<double>());
79 testRuntimeSpan(std::span<A>());
80 testRuntimeSpan(std::span<std::string>());
81
82 testRuntimeSpan(std::span<int, 0>());
83 testRuntimeSpan(std::span<long, 0>());
84 testRuntimeSpan(std::span<double, 0>());
85 testRuntimeSpan(std::span<A, 0>());
86 testRuntimeSpan(std::span<std::string, 0>());
87
88 testRuntimeSpan(std::span<int>(iArr2, 1));
89 testRuntimeSpan(std::span<int>(iArr2, 2));
90 testRuntimeSpan(std::span<int>(iArr2, 3));
91 testRuntimeSpan(std::span<int>(iArr2, 4));
92 testRuntimeSpan(std::span<int>(iArr2, 5));
93
94 std::string s;
95 testRuntimeSpan(std::span<std::string>(&s, (std::size_t)0));
96 testRuntimeSpan(std::span<std::string>(&s, 1));
97
98 return 0;
99}
100

source code of libcxx/test/std/containers/views/views.span/span.iterators/end.pass.cpp