libstdc++-v3/testsuite/23_containers/unordered_multiset/erase/2.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2011-2023 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 <unordered_set>
  21 #include <string>
  22 #include <testsuite_hooks.h>
  23
  24 namespace
  25 {
  26   std::size_t
  27   get_nb_bucket_elems(const std::unordered_multiset<std::string>& us)
  28   {
  29     std::size_t nb = 0;
  30     for (std::size_t b = 0; b != us.bucket_count(); ++b)
  31       nb += us.bucket_size(b);
  32     return nb;
  33   }
  34 }
  35
  36 void test01()
  37 {
  38   typedef std::unordered_multiset<std::string> Mset;
  39   typedef Mset::iterator       iterator;
  40   typedef Mset::const_iterator const_iterator;
  41
  42   Mset ms1;
  43
  44   ms1.insert("foo");
  45   ms1.insert("foo");
  46   ms1.insert("foo");
  47   ms1.insert("foo");
  48   ms1.insert("foo");
  49   ms1.insert("foo");
  50   ms1.insert("bar");
  51   ms1.insert("bar");
  52   ms1.insert("bar");
  53   ms1.insert("bar");
  54   ms1.insert("bar");
  55   ms1.insert("bar");
  56   VERIFY( ms1.size() == 12 );
  57   VERIFY( get_nb_bucket_elems(ms1) == ms1.size() );
  58   VERIFY( distance(ms1.begin(), ms1.end()) - ms1.size() == 0 );
  59
  60   VERIFY( ms1.erase(ms1.begin()) != ms1.end() );
  61   VERIFY( ms1.size() == 11 );
  62   VERIFY( get_nb_bucket_elems(ms1) == ms1.size() );
  63   VERIFY( distance(ms1.begin(), ms1.end()) - ms1.size() == 0 );
  64
  65   auto it = ms1.begin();
  66   advance(it, 2);
  67   VERIFY( ms1.erase(ms1.begin(), it) != ms1.end() );
  68   VERIFY( ms1.size() == 9 );
  69   VERIFY( get_nb_bucket_elems(ms1) == ms1.size() );
  70   VERIFY( distance(ms1.begin(), ms1.end()) - ms1.size() == 0 );
  71
  72   VERIFY( ms1.erase(*(ms1.begin())) == 3 );
  73   VERIFY( ms1.size() == 6 );
  74   VERIFY( get_nb_bucket_elems(ms1) == ms1.size() );
  75   VERIFY( distance(ms1.begin(), ms1.end()) - ms1.size() == 0 );
  76
  77   VERIFY( ms1.erase(ms1.begin(), ms1.end()) == ms1.end() );
  78   VERIFY( ms1.empty() );
  79   VERIFY( get_nb_bucket_elems(ms1) == ms1.size() );
  80   VERIFY( distance(ms1.begin(), ms1.end()) - ms1.size() == 0 );
  81 }
  82
  83 int main()
  84 {
  85   test01();
  86   return 0;
  87 }