| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // (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_vectorstream |
| #include <boost/interprocess/containers/vector.hpp> |
| #include <boost/interprocess/containers/string.hpp> |
| #include <boost/interprocess/allocators/allocator.hpp> |
| #include <boost/interprocess/managed_shared_memory.hpp> |
| #include <boost/interprocess/streams/vectorstream.hpp> |
| #include <iterator> |
| //<- |
| #include "../test/get_process_id_name.hpp" |
| //-> |
| |
| using namespace boost::interprocess; |
| |
| typedef allocator<int, managed_shared_memory::segment_manager> |
| IntAllocator; |
| typedef allocator<char, managed_shared_memory::segment_manager> |
| CharAllocator; |
| typedef vector<int, IntAllocator> MyVector; |
| typedef basic_string |
| <char, std::char_traits<char>, CharAllocator> MyString; |
| typedef basic_vectorstream<MyString> MyVectorStream; |
| |
| int main () |
| { |
| //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 segment( |
| create_only, |
| test::get_process_id_name(), //segment name |
| 65536); //segment size in bytes |
| #else |
| //-> |
| managed_shared_memory segment( |
| create_only, |
| "MySharedMemory", //segment name |
| 65536); //segment size in bytes |
| //<- |
| #endif |
| //-> |
| |
| //Construct shared memory vector |
| MyVector *myvector = |
| segment.construct<MyVector>("MyVector") |
| (IntAllocator(segment.get_segment_manager())); |
| |
| //Fill vector |
| myvector->reserve(100); |
| for(int i = 0; i < 100; ++i){ |
| myvector->push_back(i); |
| } |
| |
| //Create the vectorstream. To create the internal shared memory |
| //basic_string we need to pass the shared memory allocator as |
| //a constructor argument |
| MyVectorStream myvectorstream(CharAllocator(segment.get_segment_manager())); |
| |
| //Reserve the internal string |
| myvectorstream.reserve(100*5); |
| |
| //Write all vector elements as text in the internal string |
| //Data will be directly written in shared memory, because |
| //internal string's allocator is a shared memory allocator |
| for(std::size_t i = 0, max = myvector->size(); i < max; ++i){ |
| myvectorstream << (*myvector)[i] << std::endl; |
| } |
| |
| //Auxiliary vector to compare original data |
| MyVector *myvector2 = |
| segment.construct<MyVector>("MyVector2") |
| (IntAllocator(segment.get_segment_manager())); |
| |
| //Avoid reallocations |
| myvector2->reserve(100); |
| |
| //Extract all values from the internal |
| //string directly to a shared memory vector. |
| std::istream_iterator<int> it(myvectorstream), itend; |
| std::copy(it, itend, std::back_inserter(*myvector2)); |
| |
| //Compare vectors |
| assert(std::equal(myvector->begin(), myvector->end(), myvector2->begin())); |
| |
| //Create a copy of the internal string |
| MyString stringcopy (myvectorstream.vector()); |
| |
| //Now we create a new empty shared memory string... |
| MyString *mystring = |
| segment.construct<MyString>("MyString") |
| (CharAllocator(segment.get_segment_manager())); |
| |
| //...and we swap vectorstream's internal string |
| //with the new one: after this statement mystring |
| //will be the owner of the formatted data. |
| //No reallocations, no data copies |
| myvectorstream.swap_vector(*mystring); |
| |
| //Let's compare both strings |
| assert(stringcopy == *mystring); |
| |
| //Done, destroy and delete vectors and string from the segment |
| segment.destroy_ptr(myvector2); |
| segment.destroy_ptr(myvector); |
| segment.destroy_ptr(mystring); |
| return 0; |
| } |
| //] |
| #include <boost/interprocess/detail/config_end.hpp> |