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

   1 // 2004-10-10  Paolo Carlini  <pcarlini@suse.de>
   2
   3 // Copyright (C) 2004-2014 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 // 20.4.1.1 allocator members
  21
  22 #include <ext/pool_allocator.h>
  23
  24 struct small
  25 {
  26   char c[16];
  27 };
  28
  29 struct big
  30 {
  31   char c[64];
  32 };
  33
  34 void*
  35 operator new(size_t n) throw(std::bad_alloc)
  36 {
  37   static bool first = true;
  38   if (!first)
  39     throw std::bad_alloc();
  40   first = false;
  41   return std::malloc(n);
  42 }
  43
  44 // http://gcc.gnu.org/ml/libstdc++/2004-10/msg00098.html
  45 void test01()
  46 {
  47   using __gnu_cxx::__pool_alloc;
  48
  49   __pool_alloc<big> alloc_big;
  50   alloc_big.allocate(1);
  51
  52   // The constant 20 comes from __pool_alloc_base::_M_refill. See
  53   // also __pool_alloc_base::_M_allocate_chunk.
  54   __pool_alloc<small> alloc_small;
  55   for (unsigned int i = 0; i < 20 * sizeof(big) / sizeof(small) + 1; ++i)
  56     alloc_small.allocate(1);
  57 }
  58
  59 int main()
  60 {
  61   test01();
  62 }