ceph/src/boost/libs/interprocess/example/doc_cont.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 #include <boost/interprocess/detail/config_begin.hpp>
  11 #include <boost/interprocess/detail/workaround.hpp>
  12 //[doc_cont
  13 #include <boost/interprocess/containers/vector.hpp>
  14 #include <boost/interprocess/allocators/allocator.hpp>
  15 #include <boost/interprocess/managed_shared_memory.hpp>
  16 //<-
  17 #include "../test/get_process_id_name.hpp"
  18 //->
  19
  20 int main ()
  21 {
  22    using namespace boost::interprocess;
  23    //Remove shared memory on construction and destruction
  24    struct shm_remove
  25    {
  26    //<-
  27    #if 1
  28       shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
  29       ~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
  30    #else
  31    //->
  32       shm_remove() { shared_memory_object::remove("MySharedMemory"); }
  33       ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
  34    //<-
  35    #endif
  36    //->
  37    } remover;
  38    //<-
  39    (void)remover;
  40    //->
  41
  42    //A managed shared memory where we can construct objects
  43    //associated with a c-string
  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    //Alias an STL-like allocator of ints that allocates ints from the segment
  57    typedef allocator<int, managed_shared_memory::segment_manager>
  58       ShmemAllocator;
  59
  60    //Alias a vector that uses the previous STL-like allocator
  61    typedef vector<int, ShmemAllocator> MyVector;
  62
  63    int initVal[]        = {0, 1, 2, 3, 4, 5, 6 };
  64    const int *begVal    = initVal;
  65    const int *endVal    = initVal + sizeof(initVal)/sizeof(initVal[0]);
  66
  67    //Initialize the STL-like allocator
  68    const ShmemAllocator alloc_inst (segment.get_segment_manager());
  69
  70    //Construct the vector in the shared memory segment with the STL-like allocator
  71    //from a range of iterators
  72    MyVector *myvector =
  73       segment.construct<MyVector>
  74          ("MyVector")/*object name*/
  75          (begVal     /*first ctor parameter*/,
  76          endVal     /*second ctor parameter*/,
  77          alloc_inst /*third ctor parameter*/);
  78
  79    //Use vector as your want
  80    std::sort(myvector->rbegin(), myvector->rend());
  81    // . . .
  82    //When done, destroy and delete vector from the segment
  83    segment.destroy<MyVector>("MyVector");
  84    return 0;
  85 }
  86 //]
  87 #include <boost/interprocess/detail/config_end.hpp>