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// template <class It>
13// constexpr explicit(Extent != dynamic_extent) span(It first, size_type count);
14// If Extent is not equal to dynamic_extent, then count shall be equal to Extent.
15//
16// constexpr explicit(extent != dynamic_extent) span(std::initializer_list<value_type> il); // Since C++26
17
18#include <span>
19#include <cstddef>
20
21#include "test_macros.h"
22
23template <class T, std::size_t extent>
24std::span<T, extent> createImplicitSpan(T* ptr, std::size_t len) {
25 return {ptr, len}; // expected-error {{chosen constructor is explicit in copy-initialization}}
26}
27
28void test() {
29 // explicit constructor necessary
30 int arr[] = {1, 2, 3};
31 createImplicitSpan<int, 1>(arr, 3);
32
33 // expected-error@+1 {{no matching constructor for initialization of 'std::span<int>'}}
34 std::span<int> sp = {0, 0};
35 // expected-error@+1 {{no matching constructor for initialization of 'std::span<int, 2>'}}
36 std::span<int, 2> sp2 = {0, 0};
37#if TEST_STD_VER < 26
38 // expected-error@+1 {{no matching constructor for initialization of 'std::span<const int>'}}
39 std::span<const int> csp = {0, 0};
40 // expected-error@+1 {{no matching constructor for initialization of 'std::span<const int, 2>'}}
41 std::span<const int, 2> csp2 = {0, 0};
42#endif
43}
44

source code of libcxx/test/std/containers/views/views.span/span.cons/iterator_len.verify.cpp