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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.

//////////////////////////////////////////////////////////////////////////////

//[doc_managed_grow

#include <boost/interprocess/managed_shared_memory.hpp>

#include <boost/interprocess/managed_mapped_file.hpp>

#include <cassert>

//<-

#include "../test/get_process_id_name.hpp"

//->

class MyClass

{

//...

};

int main()

{

using namespace boost::interprocess;

//Remove shared memory on construction and destruction

struct shm_remove

{

shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }

~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }

} remover;

//<-

(void)remover;

//->

{

//Create a managed shared memory

managed_shared_memory shm(create_only, test::get_process_id_name(), 1000);

//Check size

assert(shm.get_size() == 1000);

//Construct a named object

MyClass *myclass = shm.construct<MyClass>("MyClass")();

//The managed segment is unmapped here

//<-

(void)myclass;

//->

}

{

//Now that the segment is not mapped grow it adding extra 500 bytes

managed_shared_memory::grow(test::get_process_id_name(), 500);

//Map it again

managed_shared_memory shm(open_only, test::get_process_id_name());

//Check size

assert(shm.get_size() == 1500);

//Check "MyClass" is still there

MyClass *myclass = shm.find<MyClass>("MyClass").first;

assert(myclass != 0);

//<-

(void)myclass;

//->

//The managed segment is unmapped here

}

{

//Now minimize the size of the segment

managed_shared_memory::shrink_to_fit(test::get_process_id_name());

//Map it again

managed_shared_memory shm(open_only, test::get_process_id_name());

//Check size

assert(shm.get_size() < 1000);

//Check "MyClass" is still there

MyClass *myclass = shm.find<MyClass>("MyClass").first;

assert(myclass != 0);

//The managed segment is unmapped here

//<-

(void)myclass;

//->

}

return 0;

}

//]

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