1 // -*- C++ -*-
2 //===------------------------------ span ---------------------------------===//
3 //
4 // The LLVM Compiler Infrastructure
5 //
6 // This file is dual licensed under the MIT and the University of Illinois Open
7 // Source Licenses. See LICENSE.TXT for details.
8 //
9 //===---------------------------------------------------------------------===//
10 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
11
12 // <span>
13
14 // template<size_t N>
15 // constexpr span(element_type (&arr)[N]) noexcept;
16 // template<size_t N>
17 // constexpr span(array<value_type, N>& arr) noexcept;
18 // template<size_t N>
19 // constexpr span(const array<value_type, N>& arr) noexcept;
20 //
21 // Remarks: These constructors shall not participate in overload resolution unless:
22 // — extent == dynamic_extent || N == extent is true, and
23 // — remove_pointer_t<decltype(data(arr))>(*)[] is convertible to ElementType(*)[].
24 //
25
26
27 #include <span>
28 #include <cassert>
29 #include <string>
30
31 #include "test_macros.h"
32
33 int arr[] = {1,2,3};
34 const int carr[] = {4,5,6};
35 volatile int varr[] = {7,8,9};
36 const volatile int cvarr[] = {1,3,5};
37
main()38 int main ()
39 {
40 // Size wrong
41 {
42 std::span<int, 2> s1(arr); // expected-error {{no matching constructor for initialization of 'std::span<int, 2>'}}
43 }
44
45 // Type wrong
46 {
47 std::span<float> s1(arr); // expected-error {{no matching constructor for initialization of 'std::span<float>'}}
48 std::span<float, 3> s2(arr); // expected-error {{no matching constructor for initialization of 'std::span<float, 3>'}}
49 }
50
51 // CV wrong (dynamically sized)
52 {
53 std::span< int> s1{ carr}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
54 std::span< int> s2{ varr}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
55 std::span< int> s3{cvarr}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
56 std::span<const int> s4{ varr}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
57 std::span<const int> s5{cvarr}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
58 std::span< volatile int> s6{ carr}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
59 std::span< volatile int> s7{cvarr}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
60 }
61
62 // CV wrong (statically sized)
63 {
64 std::span< int,3> s1{ carr}; // expected-error {{no matching constructor for initialization of 'std::span<int, 3>'}}
65 std::span< int,3> s2{ varr}; // expected-error {{no matching constructor for initialization of 'std::span<int, 3>'}}
66 std::span< int,3> s3{cvarr}; // expected-error {{no matching constructor for initialization of 'std::span<int, 3>'}}
67 std::span<const int,3> s4{ varr}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 3>'}}
68 std::span<const int,3> s5{cvarr}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 3>'}}
69 std::span< volatile int,3> s6{ carr}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 3>'}}
70 std::span< volatile int,3> s7{cvarr}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 3>'}}
71 }
72 }
73