Re: [Boost-users] How to use the shared region in append mode

I am trying in this way. I am writing the shared region and its value in a file and read the file in the map if shared region exits i make the flag = 1 else make the flag =0; bool flag = 0; // shared_memory_object::remove(MySharedMemory); if(flag == 0) managed_shared_memory segment(create_only,MySharedMemory, 99989); else managed_shared_memory segment(open_only ,MySharedMemory); void_allocator alloc_inst (segment.get_segment_manager()); / complex_map_type *mymap = segment.construct("MyMap")(std::less(), alloc_inst); Error message: Indexingtest.cpp:41: error: ‘segment’ was not declared in this scope Indexingtest.cpp:42: error: expected primary-expression before ‘>’ token Indexingtest.cpp:42: error: ‘("MyMap")’ cannot be used as a function How can i overcome such pblm. manish4gupta wrote:

First of all i would like to thank for previous answers. Now i am able to use the shared region to create a map, insert value into shared map and use the shared map. Now moving one step ahead. I am planning to use the shared region in append mode. For instance

1. create shared region if it is not used before // how to check this ? managed_shared_memory segment(create_only,MySharedMemory, 999999999); 2. create map in the region // done 3. open the map and use the map for retrieving and inserting values //done

How i can that the given region already allocated to map so that i can insert the value in it otherwise i can create the that region and create tha map and insert the value in the map.

Thanks in advance.

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