libstdc++-v3/testsuite/23_containers/set/modifiers/merge.cc

   1 // Copyright (C) 2016-2021 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-options "-std=gnu++17" }
  19 // { dg-do run { target c++17 } }
  20
  21 #include <set>
  22 #include <algorithm>
  23 #include <testsuite_hooks.h>
  24
  25 using test_type = std::set<int>;
  26
  27 void
  28 test01()
  29 {
  30   const test_type c0{ 1, 2, 3 };
  31   test_type c1 = c0, c2 = c0;
  32   c1.merge(c2);
  33   VERIFY( c1 == c0 );
  34   VERIFY( c2 == c0 );
  35
  36   c1.clear();
  37   c1.merge(c2);
  38   VERIFY( c1 == c0 );
  39   VERIFY( c2.empty() );
  40
  41   c2.merge(std::move(c1));
  42   VERIFY( c1.empty() );
  43   VERIFY( c2 == c0 );
  44 }
  45
  46 void
  47 test02()
  48 {
  49   const test_type c0{ 1, 2, 3 };
  50   test_type c1 = c0;
  51   std::set<int, std::less<>> c2( c0.begin(), c0.end() );
  52   c1.merge(c2);
  53   VERIFY( c1 == c0 );
  54   VERIFY( std::equal(c2.begin(), c2.end(), c0.begin(), c0.end()) );
  55
  56   c1.clear();
  57   c1.merge(c2);
  58   VERIFY( c1 == c0 );
  59   VERIFY( c2.empty() );
  60
  61   c2.merge(std::move(c1));
  62   VERIFY( c1.empty() );
  63   VERIFY( std::equal(c2.begin(), c2.end(), c0.begin(), c0.end()) );
  64 }
  65
  66 void
  67 test03()
  68 {
  69   const test_type c0{ 1, 2, 3 };
  70   test_type c1 = c0;
  71   std::set<int, std::greater<>> c2( c0.begin(), c0.end() );
  72   c1.merge(c2);
  73   VERIFY( c1 == c0 );
  74   VERIFY( std::equal(c2.rbegin(), c2.rend(), c0.begin(), c0.end()) );
  75
  76   c1.clear();
  77   c1.merge(c2);
  78   VERIFY( c1 == c0 );
  79   VERIFY( c2.empty() );
  80
  81   c2.merge(c1);
  82   VERIFY( c1.empty() );
  83   VERIFY( std::equal(c2.rbegin(), c2.rend(), c0.begin(), c0.end()) );
  84
  85   c1.merge(std::move(c2));
  86   VERIFY( c1 == c0 );
  87   VERIFY( c2.empty() );
  88 }
  89
  90 void
  91 test04()
  92 {
  93   const test_type c0{ 1, 2, 3 };
  94   test_type c1 = c0;
  95   std::multiset<int, std::greater<>> c2( c0.begin(), c0.end() );
  96   c1.merge(c2);
  97   VERIFY( c1 == c0 );
  98   VERIFY( std::equal(c2.rbegin(), c2.rend(), c0.begin(), c0.end()) );
  99
 100   c1.clear();
 101   c1.merge(c2);
 102   VERIFY( c1 == c0 );
 103   VERIFY( c2.empty() );
 104
 105   c2.merge(c1);
 106   VERIFY( c1.empty() );
 107   VERIFY( std::equal(c2.rbegin(), c2.rend(), c0.begin(), c0.end()) );
 108
 109   c1 = c0;
 110   c2.merge(c1);
 111   VERIFY( c1.empty() );
 112   VERIFY( c2.size() == (2 * c0.size()) );
 113   VERIFY( std::is_sorted(c2.begin(), c2.end(), c2.value_comp()) );
 114
 115   c1.merge(c2);
 116   VERIFY( c1 == c0 );
 117   VERIFY( std::equal(c2.rbegin(), c2.rend(), c0.begin(), c0.end()) );
 118
 119   c1.merge(std::move(c2));
 120   VERIFY( c1 == c0 );
 121   VERIFY( std::equal(c2.rbegin(), c2.rend(), c0.begin(), c0.end()) );
 122
 123   c1.clear();
 124   c1.merge(std::move(c2));
 125   VERIFY( c1 == c0 );
 126   VERIFY( c2.empty() );
 127 }
 128
 129 int
 130 main()
 131 {
 132   test01();
 133   test02();
 134   test03();
 135   test04();
 136 }