libstdc++-v3/testsuite/23_containers/unordered_multiset/hash_policy/dr1189.cc

   1 // { dg-do run { target c++11 } }
   2 // 2010-03-10  Paolo Carlini  <paolo.carlini@oracle.com>
   3 //
   4 // Copyright (C) 2010-2020 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 <unordered_set>
  22 #include <testsuite_hooks.h>
  23
  24 // DR 1189. Awkward interface for changing the number of buckets
  25 // in an unordered associative container
  26 void test01()
  27 {
  28   std::unordered_multiset<int> ms1;
  29   ms1.reserve(10);
  30   VERIFY( ms1.bucket_count() >= 10 );
  31
  32   ms1.reserve(100);
  33   VERIFY( ms1.bucket_count() >= 100 );
  34
  35   std::unordered_multiset<int> ms2(100);
  36   VERIFY( ms2.bucket_count() >= 100 );
  37
  38   ms2.reserve(1000);
  39   VERIFY( ms2.bucket_count() >= 1000 );
  40 }
  41
  42 int main()
  43 {
  44   test01();
  45   return 0;
  46 }