ceph/src/boost/libs/interprocess/example/doc_allocator.cpp

   1 //////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga 2006-2012. Distributed under the Boost
   4 // Software License, Version 1.0. (See accompanying file
   5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // See http://www.boost.org/libs/interprocess for documentation.
   8 //
   9 //////////////////////////////////////////////////////////////////////////////
  10
  11 #include <boost/interprocess/detail/workaround.hpp>
  12 //[doc_allocator
  13 #include <boost/interprocess/managed_shared_memory.hpp>
  14 #include <boost/interprocess/allocators/allocator.hpp>
  15 #include <cassert>
  16 //<-
  17 #include "../test/get_process_id_name.hpp"
  18 //->
  19
  20 using namespace boost::interprocess;
  21
  22 int main ()
  23 {
  24    //Remove shared memory on construction and destruction
  25    struct shm_remove
  26    {
  27    //<-
  28    #if 1
  29       shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
  30       ~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
  31    #else
  32    //->
  33       shm_remove() { shared_memory_object::remove("MySharedMemory"); }
  34       ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
  35    //<-
  36    #endif
  37    //->
  38    } remover;
  39    //<-
  40    (void)remover;
  41    //->
  42
  43    //Create shared memory
  44    //<-
  45    #if 1
  46    managed_shared_memory segment(create_only,test::get_process_id_name(), 65536);
  47    #else
  48    //->
  49    managed_shared_memory segment(create_only,
  50                                  "MySharedMemory",  //segment name
  51                                  65536);
  52    //<-
  53    #endif
  54    //->
  55
  56    //Create an allocator that allocates ints from the managed segment
  57    allocator<int, managed_shared_memory::segment_manager>
  58       allocator_instance(segment.get_segment_manager());
  59
  60    //Copy constructed allocator is equal
  61    allocator<int, managed_shared_memory::segment_manager>
  62       allocator_instance2(allocator_instance);
  63    assert(allocator_instance2 == allocator_instance);
  64
  65    //Allocate and deallocate memory for 100 ints
  66    allocator_instance2.deallocate(allocator_instance.allocate(100), 100);
  67
  68    return 0;
  69 }
  70 //]
  71