libstdc++-v3/testsuite/20_util/any/cons/in_place.cc

   1 // { dg-do run { target c++17 } }
   2
   3 // Copyright (C) 2016-2022 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 <any>
  21 #include <testsuite_hooks.h>
  22 #include <vector>
  23 #include <tuple>
  24
  25 struct combined {
  26   std::vector<int> v;
  27   std::tuple<int, int> t;
  28   template<class... Args>
  29   combined(std::initializer_list<int> il, Args&&... args)
  30     : v(il), t(std::forward<Args>(args)...)
  31   {
  32   }
  33 };
  34
  35 int main()
  36 {
  37   const int i = 42;
  38   std::any o(std::in_place_type<int>, i);
  39   int& i2 = std::any_cast<int&>(o);
  40   VERIFY( i2 == 42 );
  41   VERIFY( &i2 != &i );
  42   std::any o2(std::in_place_type<std::tuple<int, int>>, 1, 2);
  43   std::tuple<int, int>& t = std::any_cast<std::tuple<int, int>&>(o2);
  44   VERIFY( std::get<0>(t) == 1 && std::get<1>(t) == 2);
  45   std::any o3(std::in_place_type<std::vector<int>>, {42, 666});
  46   std::vector<int>& v = std::any_cast<std::vector<int>&>(o3);
  47   VERIFY(v[0] == 42 && v[1] == 666);
  48   std::any o4(std::in_place_type<combined>, {42, 666});
  49   combined& c = std::any_cast<combined&>(o4);
  50   VERIFY(c.v[0] == 42 && c.v[1] == 666
  51          && std::get<0>(c.t) == 0 && std::get<1>(c.t) == 0 );
  52   std::any o5(std::in_place_type<combined>, {1, 2}, 3, 4);
  53   combined& c2 = std::any_cast<combined&>(o5);
  54   VERIFY(c2.v[0] == 1 && c2.v[1] == 2
  55          && std::get<0>(c2.t) == 3 && std::get<1>(c2.t) == 4 );
  56   std::any o6(std::in_place_type<int&>, i);
  57   VERIFY(o6.type() == o.type());
  58   std::any o7(std::in_place_type<void()>, nullptr);
  59   std::any o8(std::in_place_type<void(*)()>, nullptr);
  60   VERIFY(o7.type() == o8.type());
  61   std::any o9(std::in_place_type<char(&)[42]>, nullptr);
  62   std::any o10(std::in_place_type<char*>, nullptr);
  63   VERIFY(o9.type() == o10.type());
  64 }