libstdc++-v3/testsuite/20_util/any/make_any.cc

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do run }
   3
   4 // Copyright (C) 2016-2020 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <any>
  22 #include <testsuite_hooks.h>
  23 #include <vector>
  24 #include <tuple>
  25
  26 struct combined {
  27   std::vector<int> v;
  28   std::tuple<int, int> t;
  29   template<class... Args>
  30   combined(std::initializer_list<int> il, Args&&... args)
  31     : v(il), t(std::forward<Args>(args)...)
  32   {
  33   }
  34 };
  35
  36 int main()
  37 {
  38   const int i = 42;
  39   auto o = std::make_any<int>(i);
  40   int& i2 = std::any_cast<int&>(o);
  41   VERIFY( i2 == 42 );
  42   VERIFY( &i2 != &i );
  43   auto o2 = std::make_any<std::tuple<int, int>>(1, 2);
  44   std::tuple<int, int>& t = std::any_cast<std::tuple<int, int>&>(o2);
  45   VERIFY( std::get<0>(t) == 1 && std::get<1>(t) == 2);
  46   auto o3 = std::make_any<std::vector<int>>({42, 666});
  47   std::vector<int>& v = std::any_cast<std::vector<int>&>(o3);
  48   VERIFY(v[0] == 42 && v[1] == 666);
  49   auto o4 = std::make_any<combined>({42, 666});
  50   combined& c = std::any_cast<combined&>(o4);
  51   VERIFY(c.v[0] == 42 && c.v[1] == 666
  52          && std::get<0>(c.t) == 0 && std::get<1>(c.t) == 0 );
  53   auto o5 = std::make_any<combined>({1, 2}, 3, 4);
  54   combined& c2 = std::any_cast<combined&>(o5);
  55   VERIFY(c2.v[0] == 1 && c2.v[1] == 2
  56          && std::get<0>(c2.t) == 3 && std::get<1>(c2.t) == 4 );
  57 }