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

   1 // { dg-options "-std=gnu++2a" }
   2 // { dg-do run { target c++2a } }
   3
   4 // Copyright (C) 2020-2021 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 <set>
  22 #include <testsuite_hooks.h>
  23
  24 struct aggressive_aggregate
  25 {
  26     int a;
  27     int b;
  28 };
  29
  30 bool operator<(const aggressive_aggregate& a,
  31                const aggressive_aggregate& b)
  32 {
  33   return a.a < b.a;
  34 };
  35
  36 void test_emplace()
  37 {
  38   std::set<aggressive_aggregate> x;
  39   auto emplaced = x.emplace(1, 2);
  40   VERIFY(emplaced.first->a == 1);
  41   VERIFY(emplaced.first->b == 2);
  42   emplaced = x.emplace(2);
  43   VERIFY(emplaced.first->a == 2);
  44   VERIFY(emplaced.first->b == 0);
  45   emplaced = x.emplace();
  46   VERIFY(emplaced.first->a == 0);
  47   VERIFY(emplaced.first->b == 0);
  48 }
  49
  50 void test_emplace_hint()
  51 {
  52   std::set<aggressive_aggregate> x;
  53   auto it = x.emplace_hint(x.begin(),
  54                       3, 2);
  55   VERIFY(it->a == 3);
  56   VERIFY(it->b == 2);
  57   it = x.emplace_hint(x.begin(),
  58                       4);
  59   VERIFY(it->a == 4);
  60   VERIFY(it->b == 0);
  61   it = x.emplace_hint(x.begin());
  62   VERIFY(it->a == 0);
  63   VERIFY(it->b == 0);
  64 }
  65
  66 int main()
  67 {
  68   test_emplace();
  69   test_emplace_hint();
  70 }