libstdc++-v3/testsuite/ext/pool_allocator/allocate_chunk.cc

   1 // 2004-10-10  Paolo Carlini  <pcarlini@suse.de>
   2
   3 // Copyright (C) 2004 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 2, 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 COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // 20.4.1.1 allocator members
  22
  23 #include <ext/pool_allocator.h>
  24
  25 struct small
  26 {
  27   char c[16];
  28 };
  29
  30 struct big
  31 {
  32   char c[64];
  33 };
  34
  35 void*
  36 operator new(size_t n) throw(std::bad_alloc)
  37 {
  38   static bool first = true;
  39   if (!first)
  40     throw std::bad_alloc();
  41   first = false;
  42   return std::malloc(n);
  43 }
  44
  45 // http://gcc.gnu.org/ml/libstdc++/2004-10/msg00098.html
  46 void test01()
  47 {
  48   using __gnu_cxx::__pool_alloc;
  49
  50   __pool_alloc<big> alloc_big;
  51   alloc_big.allocate(1);
  52
  53   // The constant 20 comes from __pool_alloc_base::_M_refill. See
  54   // also __pool_alloc_base::_M_allocate_chunk.
  55   __pool_alloc<small> alloc_small;
  56   for (int i = 0; i < 20 * sizeof(big) / sizeof(small) + 1; ++i)
  57     alloc_small.allocate(1);
  58 }
  59
  60 int main()
  61 {
  62   test01();
  63 }