libstdc++-v3/testsuite/23_containers/multiset/modifiers/insert/1.cc

   1 // 1999-06-24 bkoz
   2
   3 // Copyright (C) 1999-2025 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 // 23.3.4 template class multiset
  21
  22 #include <sstream>
  23 #include <iterator>
  24 #include <set>
  25 #include <algorithm>
  26 #include <testsuite_hooks.h>
  27
  28 namespace std
  29 {
  30   std::ostream&
  31   operator<<(std::ostream& os, std::pair<int, int> const& p)
  32   { return os << p.first << ' ' << p.second; }
  33 }
  34
  35 bool
  36 operator<(std::pair<int, int> const& lhs, std::pair<int, int> const& rhs)
  37 { return lhs.first < rhs.first; }
  38
  39 int main ()
  40 {
  41   typedef std::multiset<std::pair<int, int> >::iterator iterator;
  42   std::pair<int, int> p(69, 0);
  43   std::multiset<std::pair<int, int> > s;
  44
  45   for (p.second = 0; p.second < 5; ++p.second)
  46     s.insert(p);
  47   for (iterator it = s.begin(); it != s.end(); ++it)
  48     if (it->second < 5)
  49       {
  50         s.insert(it, p);
  51         ++p.second;
  52       }
  53
  54   std::ostringstream stream;
  55   std::copy(s.begin(), s.end(),
  56             std::ostream_iterator<std::pair<int, int> >(stream, "\n"));
  57   const std::string expected("69 0\n69 1\n69 2\n69 3\n69 4\n"
  58                              "69 5\n69 6\n69 7\n69 8\n69 9\n");
  59   std::string tested(stream.str());
  60   VERIFY( tested == expected );
  61
  62   return 0;
  63 }