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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_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;
- //<-
- (void)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::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::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>
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