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 // This test also generates spurious warnings when instantiating std::span
11 // with a very large extent (like size_t(-2)) -- silence those.
12 // ADDITIONAL_COMPILE_FLAGS: -Xclang -verify-ignore-unexpected=warning
13
14 // <span>
15
16 // template<size_t Offset, size_t Count = dynamic_extent>
17 // constexpr span<element_type, see-below> subspan() const;
18 //
19 // Mandates: Offset <= Extent && (Count == dynamic_extent || Count <= Extent - Offset) is true.
20
21 #include <span>
22 #include <cstddef>
23
f()24 void f() {
25 int array[] = {1, 2, 3, 4};
26 std::span<const int, 4> sp(array);
27
28 // Offset too large templatized
29 [[maybe_unused]] auto s1 = sp.subspan<5>(); // expected-error@span:* {{span<T, N>::subspan<Offset, Count>(): Offset out of range}}
30
31 // Count too large templatized
32 [[maybe_unused]] auto s2 = sp.subspan<0, 5>(); // expected-error@span:* {{span<T, N>::subspan<Offset, Count>(): Offset + Count out of range}}
33
34 // Offset + Count too large templatized
35 [[maybe_unused]] auto s3 = sp.subspan<2, 3>(); // expected-error@span:* {{span<T, N>::subspan<Offset, Count>(): Offset + Count out of range}}
36
37 // Offset + Count overflow templatized
38 [[maybe_unused]] auto s4 = sp.subspan<3, std::size_t(-2)>(); // expected-error@span:* {{span<T, N>::subspan<Offset, Count>(): Offset + Count out of range}}, expected-error-re@span:* {{array is too large{{(.* elements)}}}}
39 }
40