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- //////////////////////////////////////////////////////////////////////////////
- //
- // (C) Copyright Ion Gaztanaga 2006-2012. 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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