libstdc++-v3/testsuite/20_util/is_constructible/92878_92947.cc

   1 // { dg-do compile { target c++20 } }
   2
   3 // Copyright (C) 2020-2023 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10 //
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <type_traits>
  21
  22 struct aggressive_aggregate
  23 {
  24     int a;
  25     int b;
  26 };
  27
  28 struct vicious_variation
  29 {
  30     int a;
  31     int b = 42;
  32 };
  33
  34 void test01()
  35 {
  36   static_assert(std::is_constructible_v<aggressive_aggregate, int, int>);
  37   static_assert(std::is_constructible_v<aggressive_aggregate, int>);
  38   static_assert(std::is_constructible_v<aggressive_aggregate>);
  39   static_assert(std::is_default_constructible_v<aggressive_aggregate>);
  40   static_assert(std::is_trivially_default_constructible_v<
  41                 aggressive_aggregate>);
  42   static_assert(std::is_constructible_v<vicious_variation, int, int>);
  43   static_assert(std::is_constructible_v<vicious_variation, int>);
  44   static_assert(std::is_constructible_v<vicious_variation>);
  45   static_assert(std::is_default_constructible_v<vicious_variation>);
  46   static_assert(!std::is_trivially_default_constructible_v<
  47                 vicious_variation>);
  48 }