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<size_t Offset, size_t Count = dynamic_extent>
14 // constexpr span<element_type, see below> subspan() const;
15 //
16 // constexpr span<element_type, dynamic_extent> subspan(
17 // size_type offset, size_type count = dynamic_extent) const;
18 //
19 // Requires: offset <= size() &&
20 // (count == dynamic_extent || count <= size() - offset)
21
22 #include <span>
23
24 #include "test_macros.h"
25
26 constexpr int carr[] = {1, 2, 3, 4};
27
main(int,char **)28 int main(int, char**) {
29 std::span<const int, 4> sp(carr);
30
31 // Offset too large templatized
32 {
33 [[maybe_unused]] auto s1 = sp.subspan<5>(); // expected-error-re@span:* {{static_assert failed{{( due to requirement '.*')?}} "Offset out of range in span::subspan()"}}
34 }
35
36 // Count too large templatized
37 {
38 [[maybe_unused]] auto s1 = sp.subspan<0, 5>(); // expected-error-re@span:* {{static_assert failed{{( due to requirement '.*')?}} "Offset + count out of range in span::subspan()"}}
39 }
40
41 // Offset + Count too large templatized
42 {
43 [[maybe_unused]] auto s1 = sp.subspan<2, 3>(); // expected-error-re@span:* {{static_assert failed{{( due to requirement '.*')?}} "Offset + count out of range in span::subspan()"}}
44 }
45
46 // Offset + Count overflow templatized
47 {
48 [[maybe_unused]] auto s1 = sp.subspan<3, std::size_t(-2)>(); // expected-error-re@span:* {{static_assert failed{{( due to requirement '.*')?}} "Offset + count out of range in span::subspan()"}}, expected-error-re@span:* {{array is too large{{(.* elements)}}}}
49 }
50
51 return 0;
52 }
53