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

   1 // { dg-options "-std=gnu++2a" }
   2 // { dg-do run { target c++2a } }
   3
   4 // Copyright (C) 2020-2022 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 <memory>
  22 #include <testsuite_hooks.h>
  23
  24 struct aggressive_aggregate
  25 {
  26     int a;
  27     int b;
  28 };
  29
  30 void test01()
  31 {
  32   std::pair<aggressive_aggregate, int> x{std::piecewise_construct,
  33                                          std::tuple{1, 2}, std::tuple{42}};
  34   VERIFY(x.first.a == 1);
  35   VERIFY(x.first.b == 2);
  36   std::pair<aggressive_aggregate, int> y{std::piecewise_construct,
  37                                          std::tuple{1}, std::tuple{42}};
  38   VERIFY(y.first.a == 1);
  39   VERIFY(y.first.b == 0);
  40   std::pair<aggressive_aggregate, int> z{std::piecewise_construct,
  41                                          std::tuple{}, std::tuple{42}};
  42   VERIFY(z.first.a == 0);
  43   VERIFY(z.first.b == 0);
  44 }
  45
  46 int main()
  47 {
  48   test01();
  49 }