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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2006-2011. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/interprocess for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#include <boost/interprocess/detail/config_begin.hpp>
#include <boost/interprocess/detail/workaround.hpp>
//[doc_map
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/containers/map.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <functional>
#include <utility>
//<-
#include "../test/get_process_id_name.hpp"
//->
int main ()
{
using namespace boost::interprocess;
//Remove shared memory on construction and destruction
struct shm_remove
{
//<-
#if 1
shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
#else
//->
shm_remove() { shared_memory_object::remove("MySharedMemory"); }
~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
//<-
#endif
//->
} remover;
//<-
(void)remover;
//->
//Shared memory front-end that is able to construct objects
//associated with a c-string. Erase previous shared memory with the name
//to be used and create the memory segment at the specified address and initialize resources
//<-
#if 1
managed_shared_memory segment(create_only,test::get_process_id_name(), 65536);
#else
//->
managed_shared_memory segment
(create_only
,"MySharedMemory" //segment name
,65536); //segment size in bytes
//<-
#endif
//->
//Note that map<Key, MappedType>'s value_type is std::pair<const Key, MappedType>,
//so the allocator must allocate that pair.
typedef int KeyType;
typedef float MappedType;
typedef std::pair<const int, float> ValueType;
//Alias an STL compatible allocator of for the map.
//This allocator will allow to place containers
//in managed shared memory segments
typedef allocator<ValueType, managed_shared_memory::segment_manager>
ShmemAllocator;
//Alias a map of ints that uses the previous STL-like allocator.
//Note that the third parameter argument is the ordering function
//of the map, just like with std::map, used to compare the keys.
typedef map<KeyType, MappedType, std::less<KeyType>, ShmemAllocator> MyMap;
//Initialize the shared memory STL-compatible allocator
ShmemAllocator alloc_inst (segment.get_segment_manager());
//Construct a shared memory map.
//Note that the first parameter is the comparison function,
//and the second one the allocator.
//This the same signature as std::map's constructor taking an allocator
MyMap *mymap =
segment.construct<MyMap>("MyMap") //object name
(std::less<int>() //first ctor parameter
,alloc_inst); //second ctor parameter
//Insert data in the map
for(int i = 0; i < 100; ++i){
mymap->insert(std::pair<const int, float>(i, (float)i));
}
return 0;
}
//]
#include <boost/interprocess/detail/config_end.hpp>
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