138 lines
4.3 KiB
C++
138 lines
4.3 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2006-2012. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#include <boost/interprocess/detail/config_begin.hpp>
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#include <boost/interprocess/detail/workaround.hpp>
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//[doc_vectorstream
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#include <boost/interprocess/containers/vector.hpp>
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#include <boost/interprocess/containers/string.hpp>
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#include <boost/interprocess/allocators/allocator.hpp>
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#include <boost/interprocess/managed_shared_memory.hpp>
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#include <boost/interprocess/streams/vectorstream.hpp>
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#include <iterator>
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//<-
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#include "../test/get_process_id_name.hpp"
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//->
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using namespace boost::interprocess;
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typedef allocator<int, managed_shared_memory::segment_manager>
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IntAllocator;
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typedef allocator<char, managed_shared_memory::segment_manager>
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CharAllocator;
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typedef vector<int, IntAllocator> MyVector;
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typedef basic_string
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<char, std::char_traits<char>, CharAllocator> MyString;
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typedef basic_vectorstream<MyString> MyVectorStream;
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int main ()
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{
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//Remove shared memory on construction and destruction
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struct shm_remove
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{
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//<-
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#if 1
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shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
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~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
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#else
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//->
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shm_remove() { shared_memory_object::remove("MySharedMemory"); }
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~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
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//<-
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#endif
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//->
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} remover;
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//<-
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(void)remover;
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//->
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//<-
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#if 1
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managed_shared_memory segment(
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create_only,
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test::get_process_id_name(), //segment name
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65536); //segment size in bytes
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#else
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//->
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managed_shared_memory segment(
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create_only,
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"MySharedMemory", //segment name
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65536); //segment size in bytes
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//<-
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#endif
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//->
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//Construct shared memory vector
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MyVector *myvector =
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segment.construct<MyVector>("MyVector")
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(IntAllocator(segment.get_segment_manager()));
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//Fill vector
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myvector->reserve(100);
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for(int i = 0; i < 100; ++i){
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myvector->push_back(i);
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}
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//Create the vectorstream. To create the internal shared memory
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//basic_string we need to pass the shared memory allocator as
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//a constructor argument
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MyVectorStream myvectorstream(CharAllocator(segment.get_segment_manager()));
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//Reserve the internal string
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myvectorstream.reserve(100*5);
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//Write all vector elements as text in the internal string
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//Data will be directly written in shared memory, because
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//internal string's allocator is a shared memory allocator
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for(std::size_t i = 0, max = myvector->size(); i < max; ++i){
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myvectorstream << (*myvector)[i] << std::endl;
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}
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//Auxiliary vector to compare original data
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MyVector *myvector2 =
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segment.construct<MyVector>("MyVector2")
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(IntAllocator(segment.get_segment_manager()));
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//Avoid reallocations
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myvector2->reserve(100);
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//Extract all values from the internal
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//string directly to a shared memory vector.
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std::istream_iterator<int> it(myvectorstream), itend;
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std::copy(it, itend, std::back_inserter(*myvector2));
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//Compare vectors
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assert(std::equal(myvector->begin(), myvector->end(), myvector2->begin()));
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//Create a copy of the internal string
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MyString stringcopy (myvectorstream.vector());
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//Now we create a new empty shared memory string...
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MyString *mystring =
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segment.construct<MyString>("MyString")
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(CharAllocator(segment.get_segment_manager()));
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//...and we swap vectorstream's internal string
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//with the new one: after this statement mystring
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//will be the owner of the formatted data.
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//No reallocations, no data copies
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myvectorstream.swap_vector(*mystring);
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//Let's compare both strings
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assert(stringcopy == *mystring);
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//Done, destroy and delete vectors and string from the segment
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segment.destroy_ptr(myvector2);
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segment.destroy_ptr(myvector);
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segment.destroy_ptr(mystring);
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return 0;
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}
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//]
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#include <boost/interprocess/detail/config_end.hpp>
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