libstdc++-v3/testsuite/23_containers/multiset/modifiers/emplace/92878_92947.cc

   1 // { dg-do run { target c++20 } }
   2
   3 // Copyright (C) 2020-2025 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 <set>
  21 #include <testsuite_hooks.h>
  22
  23 struct aggressive_aggregate
  24 {
  25     int a;
  26     int b;
  27 };
  28
  29 bool operator<(const aggressive_aggregate& a,
  30                const aggressive_aggregate& b)
  31 {
  32   return a.a < b.a;
  33 };
  34
  35 void test_emplace()
  36 {
  37   std::multiset<aggressive_aggregate> x;
  38   auto it = x.emplace(1, 2);
  39   VERIFY(it->a == 1);
  40   VERIFY(it->b == 2);
  41   it = x.emplace(2);
  42   VERIFY(it->a == 2);
  43   VERIFY(it->b == 0);
  44   it = x.emplace();
  45   VERIFY(it->a == 0);
  46   VERIFY(it->b == 0);
  47 }
  48
  49 void test_emplace_hint()
  50 {
  51   std::multiset<aggressive_aggregate> x;
  52   auto it = x.emplace_hint(x.begin(),
  53                       3, 2);
  54   VERIFY(it->a == 3);
  55   VERIFY(it->b == 2);
  56   it = x.emplace_hint(x.begin(),
  57                       4);
  58   VERIFY(it->a == 4);
  59   VERIFY(it->b == 0);
  60   it = x.emplace_hint(x.begin());
  61   VERIFY(it->a == 0);
  62   VERIFY(it->b == 0);
  63 }
  64
  65 int main()
  66 {
  67   test_emplace();
  68   test_emplace_hint();
  69 }