| // { dg-do compile { target c++17 } } |
| |
| // Copyright (C) 2016-2021 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/>. |
| |
| #include <utility> |
| #include <type_traits> |
| #include <testsuite_hooks.h> |
| |
| using std::in_place_t; |
| using std::in_place_type_t; |
| using std::in_place_index_t; |
| |
| float f(in_place_type_t<float>); |
| double f(in_place_type_t<double>); |
| char f(in_place_index_t<0>); |
| unsigned int f(in_place_index_t<1>); |
| int f(in_place_t); |
| |
| static_assert(std::is_same<decltype(f(std::in_place)), int>::value); |
| static_assert(std::is_same<decltype(f(std::in_place_type<float>)), |
| float>::value); |
| static_assert(std::is_same<decltype(f(std::in_place_type<double>)), |
| double>::value); |
| static_assert(std::is_same<decltype(f(std::in_place_index<0>)), char>::value); |
| static_assert(std::is_same<decltype(f(std::in_place_index<1>)), |
| unsigned int>::value); |
| |
| template <class T, class... Args> float h(in_place_type_t<T>, Args&&...); |
| template <size_t N, class... Args> int h(in_place_index_t<N>, Args&&...); |
| template <class T> double h(in_place_t, T&&); |
| |
| static_assert(std::is_same<decltype(h(std::in_place, 1)), double>::value); |
| static_assert(std::is_same<decltype(h(std::in_place_type<float>, 1)), |
| float>::value); |
| static_assert(std::is_same<decltype(h(std::in_place_index<0>, 1)), |
| int>::value); |