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 N>
14 // constexpr span(element_type (&arr)[N]) noexcept;
15 // template<size_t N>
16 // constexpr span(array<value_type, N>& arr) noexcept;
17 // template<size_t N>
18 // constexpr span(const array<value_type, N>& arr) noexcept;
19 //
20 // Remarks: These constructors shall not participate in overload resolution unless:
21 // — extent == dynamic_extent || N == extent is true, and
22 // — remove_pointer_t<decltype(data(arr))>(*)[] is convertible to ElementType(*)[].
23 //
24
25
26 #include <span>
27 #include <cassert>
28 #include <string>
29
30 #include "test_macros.h"
31
32 int arr[] = {1,2,3};
33 const int carr[] = {4,5,6};
34 volatile int varr[] = {7,8,9};
35 const volatile int cvarr[] = {1,3,5};
36
main(int,char **)37 int main(int, char**)
38 {
39 // Size wrong
40 {
41 std::span<int, 2> s1(arr); // expected-error {{no matching constructor for initialization of 'std::span<int, 2>'}}
42 }
43
44 // Type wrong
45 {
46 std::span<float> s1(arr); // expected-error {{no matching constructor for initialization of 'std::span<float>'}}
47 std::span<float, 3> s2(arr); // expected-error {{no matching constructor for initialization of 'std::span<float, 3>'}}
48 }
49
50 // CV wrong (dynamically sized)
51 {
52 std::span< int> s1{ carr}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
53 std::span< int> s2{ varr}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
54 std::span< int> s3{cvarr}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
55 std::span<const int> s4{ varr}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
56 std::span<const int> s5{cvarr}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
57 std::span< volatile int> s6{ carr}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
58 std::span< volatile int> s7{cvarr}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
59 }
60
61 // CV wrong (statically sized)
62 {
63 std::span< int,3> s1{ carr}; // expected-error {{no matching constructor for initialization of 'std::span<int, 3>'}}
64 std::span< int,3> s2{ varr}; // expected-error {{no matching constructor for initialization of 'std::span<int, 3>'}}
65 std::span< int,3> s3{cvarr}; // expected-error {{no matching constructor for initialization of 'std::span<int, 3>'}}
66 std::span<const int,3> s4{ varr}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 3>'}}
67 std::span<const int,3> s5{cvarr}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 3>'}}
68 std::span< volatile int,3> s6{ carr}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 3>'}}
69 std::span< volatile int,3> s7{cvarr}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 3>'}}
70 }
71
72 return 0;
73 }
74