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 17 #include <span> 18 #include <cstddef> 19 20 template <class T, size_t extent> 21 std::span<T, extent> createImplicitSpan(T* ptr, size_t len) { 22 return {ptr, len}; // expected-error {{chosen constructor is explicit in copy-initialization}} 23 } 24 25 int main(int, char**) { 26 // explicit constructor necessary 27 int arr[] = {1, 2, 3}; 28 createImplicitSpan<int, 1>(arr, 3); 29 30 std::span<int> sp = {0, 0}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}} 31 std::span<int, 2> sp2 = {0, 0}; // expected-error {{no matching constructor for initialization of 'std::span<int, 2>'}} 32 std::span<const int> csp = {0, 0}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}} 33 std::span<const int, 2> csp2 = {0, 0}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 2>'}} 34 35 return 0; 36 } 37