| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // (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_unordered_map |
| #include <boost/interprocess/managed_shared_memory.hpp> |
| #include <boost/interprocess/allocators/allocator.hpp> |
| |
| #include <boost/unordered_map.hpp> //boost::unordered_map |
| #include <functional> //std::equal_to |
| #include <boost/functional/hash.hpp> //boost::hash |
| //<- |
| #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; |
| |
| //Create shared memory |
| //<- |
| #if 1 |
| managed_shared_memory segment(create_only, test::get_process_id_name(), 65536); |
| #else |
| //-> |
| managed_shared_memory segment(create_only, "MySharedMemory", 65536); |
| //<- |
| #endif |
| //-> |
| |
| //Note that unordered_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; |
| |
| //Typedef the allocator |
| typedef allocator<ValueType, managed_shared_memory::segment_manager> ShmemAllocator; |
| |
| //Alias an unordered_map of ints that uses the previous STL-like allocator. |
| typedef boost::unordered_map |
| < KeyType , MappedType |
| , boost::hash<KeyType> ,std::equal_to<KeyType> |
| , ShmemAllocator> |
| MyHashMap; |
| |
| //Construct a shared memory hash map. |
| //Note that the first parameter is the initial bucket count and |
| //after that, the hash function, the equality function and the allocator |
| MyHashMap *myhashmap = segment.construct<MyHashMap>("MyHashMap") //object name |
| ( 3, boost::hash<int>(), std::equal_to<int>() // |
| , segment.get_allocator<ValueType>()); //allocator instance |
| |
| //Insert data in the hash map |
| for(int i = 0; i < 100; ++i){ |
| myhashmap->insert(ValueType(i, (float)i)); |
| } |
| return 0; |
| } |
| //] |
| #include <boost/interprocess/detail/config_end.hpp> |