| // Copyright (C) 2020-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-options "-std=gnu++2a" } |
| // { dg-do compile { target c++2a } } |
| |
| #include <span> |
| |
| template<typename T, int N, typename U> |
| constexpr bool is_static_span(const U&) |
| { |
| return std::is_same_v<std::span<T, N>, U> && N != std::dynamic_extent; |
| } |
| |
| template<typename T, typename U> |
| constexpr bool is_dynamic_span(const U&) |
| { |
| return std::is_same_v<std::span<T>, U>; |
| } |
| |
| struct Range |
| { |
| float* begin() const; |
| float* end() const; |
| }; |
| |
| void |
| test01() |
| { |
| const char c[] = ""; |
| int i[2]{}; |
| std::array<long, 3> a; |
| Range r; |
| |
| std::span s1(c); |
| static_assert( is_static_span<const char, 1>(s1) ); |
| |
| std::span s2(i); |
| static_assert( is_static_span<int, 2>(s2) ); |
| |
| std::span s3(a); |
| static_assert( is_static_span<long, 3>(s3) ); |
| |
| std::span s4(const_cast<const std::array<long, 3>&>(a)); |
| static_assert( is_static_span<const long, 3>(s4) ); |
| |
| std::span s5(std::begin(i), std::end(i)); |
| static_assert( is_dynamic_span<int>(s5) ); |
| |
| std::span s6(std::cbegin(i), std::cend(i)); |
| static_assert( is_dynamic_span<const int>(s6) ); |
| |
| std::span s7(r); |
| static_assert( is_dynamic_span<float>(s7) ); |
| |
| std::span s8(s1); |
| static_assert( is_static_span<const char, 1>(s8) ); |
| |
| std::span s9(s2); |
| static_assert( is_static_span<int, 2>(s9) ); |
| |
| std::span s10(const_cast<const std::span<int, 2>&>(s2)); |
| static_assert( is_static_span<int, 2>(s10) ); |
| |
| std::span s11(s5); |
| static_assert( is_dynamic_span<int>(s11) ); |
| |
| std::span s12(const_cast<const std::span<int>&>(s5)); |
| static_assert( is_dynamic_span<int>(s12) ); |
| } |