Re: [Boost-users] How to Read the stored memory map in C++

I did the needful for construction and destruction but it does not seem to be working. May i know what is the pblm. Thanks in advance. manish4gupta wrote:

#include #include #include #include #include #include <iostream>

using namespace boost::interprocess;

//Typedefs of allocators and containers typedef managed_shared_memory::segment_manager segment_manager_t; typedef allocator void_allocator; typedef allocator int_allocator; typedef vector int_vector; typedef allocator int_vector_allocator; typedef vector int_vector_vector; typedef allocator char_allocator; typedef basic_string char_string;

class complex_data { int id_; char_string char_string_; int_vector_vector int_vector_vector_;

public: //Since void_allocator is convertible to any other allocator<T>, we can simplify //the initialization taking just one allocator for all inner containers. complex_data(int id, const char *name, const void_allocator &void_alloc) : id_(id), char_string_(name, void_alloc), int_vector_vector_(void_alloc) {} //Other members... };

//Definition of the map holding a string as key and complex_data as mapped type typedef std::pair map_value_type; typedef std::pair movable_to_map_value_type; typedef allocator map_value_type_allocator; typedef map< char_string, int , std::less, map_value_type_allocator> complex_map_type;

int main () { //Remove shared memory on construction and destruction struct shm_remove { shm_remove() { shared_memory_object::remove("MySharedMemory"); } ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); } } remover;

//Create shared memory managed_shared_memory segment(create_only,"MySharedMemory", 65536);

//An allocator convertible to any allocator type void_allocator alloc_inst (segment.get_segment_manager());

//Construct the shared memory map and fill it complex_map_type *mymap = segment.construct //(object name), (first ctor parameter, second ctor parameter) ("MyMap")(std::less(), alloc_inst); std::string s = "test"; char_string cs(s.c_str(), alloc_inst); //string y (cs.c_str()); //std::cout << y <<"\n";

// = (char_string)s;

for(int i = 0; i < 100; ++i) { mymap->insert(std::pair(cs , i)); //char_string key_object(alloc_inst); //map_value_type value(key_object, i); // mymap->insert(value); } shared_memory_object::remove("MySharedMemory"); return 0; }

Now i have added the line shared_memory_object::remove("MySharedMemory") in process1 to remove the shared memory but still error is same.

Christoph Gysin-3 wrote:

...

...

  //Remove shared memory on construction and destruction   struct shm_remove   {      shm_remove() { shared_memory_object::remove("MySharedMemory"); }      ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }   } remover;

You tell Process1 to clean it up on exit.

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