| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // (C) Copyright Ion Gaztanaga 2006-2009. 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; |
| |
| //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> |