| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // (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_move_containers |
| #include <boost/interprocess/managed_shared_memory.hpp> |
| #include <boost/interprocess/containers/vector.hpp> |
| #include <boost/interprocess/containers/string.hpp> |
| #include <boost/interprocess/allocators/allocator.hpp> |
| #include <cassert> |
| //<- |
| #include "../test/get_process_id_name.hpp" |
| //-> |
| |
| int main () |
| { |
| using namespace boost::interprocess; |
| |
| //Typedefs |
| typedef managed_shared_memory::segment_manager SegmentManager; |
| typedef allocator<char, SegmentManager> CharAllocator; |
| typedef basic_string<char, std::char_traits<char> |
| ,CharAllocator> MyShmString; |
| typedef allocator<MyShmString, SegmentManager> StringAllocator; |
| typedef vector<MyShmString, StringAllocator> MyShmStringVector; |
| |
| //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; |
| |
| //<- |
| #if 1 |
| managed_shared_memory shm(create_only, test::get_process_id_name(), 65536); |
| #else |
| //-> |
| managed_shared_memory shm(create_only, "MySharedMemory", 10000); |
| //<- |
| #endif |
| //-> |
| |
| //Create allocators |
| CharAllocator charallocator (shm.get_segment_manager()); |
| StringAllocator stringallocator(shm.get_segment_manager()); |
| |
| //Create a vector of strings in shared memory. |
| MyShmStringVector *myshmvector = |
| shm.construct<MyShmStringVector>("myshmvector")(stringallocator); |
| |
| //Insert 50 strings in shared memory. The strings will be allocated |
| //only once and no string copy-constructor will be called when inserting |
| //strings, leading to a great performance. |
| MyShmString string_to_compare(charallocator); |
| string_to_compare = "this is a long, long, long, long, long, long, string..."; |
| |
| myshmvector->reserve(50); |
| for(int i = 0; i < 50; ++i){ |
| MyShmString move_me(string_to_compare); |
| //In the following line, no string copy-constructor will be called. |
| //"move_me"'s contents will be transferred to the string created in |
| //the vector |
| myshmvector->push_back(boost::interprocess::move(move_me)); |
| |
| //The source string is in default constructed state |
| assert(move_me.empty()); |
| |
| //The newly created string will be equal to the "move_me"'s old contents |
| assert(myshmvector->back() == string_to_compare); |
| } |
| |
| //Now erase a string... |
| myshmvector->pop_back(); |
| |
| //...And insert one in the first position. |
| //No string copy-constructor or assignments will be called, but |
| //move constructors and move-assignments. No memory allocation |
| //function will be called in this operations!! |
| myshmvector->insert(myshmvector->begin(), boost::interprocess::move(string_to_compare)); |
| |
| //Destroy vector. This will free all strings that the vector contains |
| shm.destroy_ptr(myshmvector); |
| return 0; |
| } |
| //] |
| #include <boost/interprocess/detail/config_end.hpp> |
| |