libs/interprocess/example/doc_complex_map.cpp

   1 //////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga 2006-2009. 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_complex_map
  13 #include <boost/interprocess/managed_shared_memory.hpp>
  14 #include <boost/interprocess/allocators/allocator.hpp>
  15 #include <boost/interprocess/containers/map.hpp>
  16 #include <boost/interprocess/containers/vector.hpp>
  17 #include <boost/interprocess/containers/string.hpp>
  18 //<-
  19 #include "../test/get_process_id_name.hpp"
  20 //->
  21
  22 using namespace boost::interprocess;
  23
  24 //Typedefs of allocators and containers
  25 typedef managed_shared_memory::segment_manager                       segment_manager_t;
  26 typedef allocator<void, segment_manager_t>                           void_allocator;
  27 typedef allocator<int, segment_manager_t>                            int_allocator;
  28 typedef vector<int, int_allocator>                                   int_vector;
  29 typedef allocator<int_vector, segment_manager_t>                     int_vector_allocator;
  30 typedef vector<int_vector, int_vector_allocator>                     int_vector_vector;
  31 typedef allocator<char, segment_manager_t>                           char_allocator;
  32 typedef basic_string<char, std::char_traits<char>, char_allocator>   char_string;
  33
  34 class complex_data
  35 {
  36    int               id_;
  37    char_string       char_string_;
  38    int_vector_vector int_vector_vector_;
  39
  40    public:
  41    //Since void_allocator is convertible to any other allocator<T>, we can simplify
  42    //the initialization taking just one allocator for all inner containers.
  43    complex_data(int id, const char *name, const void_allocator &void_alloc)
  44       : id_(id), char_string_(name, void_alloc), int_vector_vector_(void_alloc)
  45    {}
  46    //Other members...
  47 };
  48
  49 //Definition of the map holding a string as key and complex_data as mapped type
  50 typedef std::pair<const char_string, complex_data>                      map_value_type;
  51 typedef std::pair<char_string, complex_data>                            movable_to_map_value_type;
  52 typedef allocator<map_value_type, segment_manager_t>                    map_value_type_allocator;
  53 typedef map< char_string, complex_data
  54            , std::less<char_string>, map_value_type_allocator>          complex_map_type;
  55
  56 int main ()
  57 {
  58    //Remove shared memory on construction and destruction
  59    struct shm_remove
  60    {
  61       //<-
  62       #if 1
  63       shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
  64       ~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
  65       #else
  66       //->
  67       shm_remove() { shared_memory_object::remove("MySharedMemory"); }
  68       ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
  69       //<-
  70       #endif
  71       //->
  72    } remover;
  73
  74    //Create shared memory
  75    //<-
  76    #if 1
  77    managed_shared_memory segment(create_only,test::get_process_id_name(), 65536);
  78    #else
  79    //->
  80    managed_shared_memory segment(create_only,"MySharedMemory", 65536);
  81    //<-
  82    #endif
  83    //->
  84
  85    //An allocator convertible to any allocator<T, segment_manager_t> type
  86    void_allocator alloc_inst (segment.get_segment_manager());
  87
  88    //Construct the shared memory map and fill it
  89    complex_map_type *mymap = segment.construct<complex_map_type>
  90       //(object name), (first ctor parameter, second ctor parameter)
  91          ("MyMap")(std::less<char_string>(), alloc_inst);
  92
  93    for(int i = 0; i < 100; ++i){
  94       //Both key(string) and value(complex_data) need an allocator in their constructors
  95       char_string  key_object(alloc_inst);
  96       complex_data mapped_object(i, "default_name", alloc_inst);
  97       map_value_type value(key_object, mapped_object);
  98       //Modify values and insert them in the map
  99       mymap->insert(value);
 100    }
 101    return 0;
 102 }
 103 //]
 104 #include <boost/interprocess/detail/config_end.hpp>