libstdc++-v3/testsuite/tr1/6_containers/unordered_set/26132.cc

   1 // 2006-02-22  Paolo Carlini  <pcarlini@suse.de>
   2 //
   3 // Copyright (C) 2006-2023 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 // 6.3 Unordered associative containers
  21
  22 #include <tr1/unordered_set>
  23 #include <testsuite_hooks.h>
  24
  25 // libstdc++/26132
  26 void test01()
  27 {
  28   for (float lf = 1.0; lf < 101.0; lf *= 10.0)
  29     for (int size = 1; size <= 6561; size *= 3)
  30       {
  31         std::tr1::unordered_set<int> us1;
  32         typedef std::tr1::unordered_set<int>::size_type size_type;
  33
  34         us1.max_load_factor(10.0);
  35
  36         for (int i = 0; i < size; ++i)
  37           us1.insert(i);
  38
  39         us1.max_load_factor(lf);
  40
  41         for (int i = 1; i <= 6561; i *= 81)
  42           {
  43             const size_type n = size * 81 / i;
  44             us1.rehash(n);
  45             VERIFY( us1.bucket_count() > us1.size() / us1.max_load_factor() );
  46             VERIFY( us1.bucket_count() >= n );
  47           }
  48       }
  49 }
  50
  51 int main()
  52 {
  53   test01();
  54   return 0;
  55 }