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

   1 // { dg-options "-std=gnu++11" }
   2 // 2010-03-10  Paolo Carlini  <paolo.carlini@oracle.com>
   3 //
   4 // Copyright (C) 2010-2016 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   bool test __attribute__((unused)) = true;
  29
  30   std::unordered_set<int> s1;
  31   s1.reserve(10);
  32   VERIFY( s1.bucket_count() >= 10 );
  33
  34   s1.reserve(100);
  35   VERIFY( s1.bucket_count() >= 100 );
  36
  37   std::unordered_set<int> s2(100);
  38   VERIFY( s2.bucket_count() >= 100 );
  39
  40   s2.reserve(1000);
  41   VERIFY( s2.bucket_count() >= 1000 );
  42 }
  43
  44 int main()
  45 {
  46   test01();
  47   return 0;
  48 }