libstdc++-v3/testsuite/23_containers/list/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 <list>
  22 #include <testsuite_hooks.h>
  23
  24 struct aggressive_aggregate
  25 {
  26     int a;
  27     int b;
  28 };
  29
  30 void test_emplace_front()
  31 {
  32   std::list<aggressive_aggregate> x;
  33   x.emplace_front(1, 2);
  34   VERIFY(x.front().a == 1);
  35   VERIFY(x.front().b == 2);
  36   x.emplace_front(1);
  37   VERIFY(x.front().a == 1);
  38   VERIFY(x.front().b == 0);
  39   x.emplace_front();
  40   VERIFY(x.front().a == 0);
  41   VERIFY(x.front().b == 0);
  42 }
  43
  44 void test_emplace_back()
  45 {
  46   std::list<aggressive_aggregate> x;
  47   x.emplace_back(1, 2);
  48   VERIFY(x.back().a == 1);
  49   VERIFY(x.back().b == 2);
  50   x.emplace_back(1);
  51   VERIFY(x.back().a == 1);
  52   VERIFY(x.back().b == 0);
  53   x.emplace_back();
  54   VERIFY(x.back().a == 0);
  55   VERIFY(x.back().b == 0);
  56 }
  57
  58 void test_emplace()
  59 {
  60   std::list<aggressive_aggregate> x{{42, 666}};
  61   auto y = x.emplace(x.begin(), 1, 2);
  62   VERIFY(y->a == 1);
  63   VERIFY(y->b == 2);
  64   y = x.emplace(x.begin(), 1);
  65   VERIFY(y->a == 1);
  66   VERIFY(y->b == 0);
  67   y = x.emplace(x.begin());
  68   VERIFY(y->a == 0);
  69   VERIFY(y->b == 0);
  70 }
  71
  72
  73 int main()
  74 {
  75   test_emplace_front();
  76   test_emplace_back();
  77   test_emplace();
  78 }