[Boost-users] Making friend with boost::interprocess

Subject: [Boost-users] Making friend with boost::interprocess
From: Oncaphillis (oncaphillis_at_[hidden])
Date: 2009-03-11 03:57:56

Hi,

I'd like to implement a cross-process singleton which resides in
a shared memory segment. So the basic idea is to provide a factory
method that is the only way to construct the Singleton.

e.g.

class Foo {
public:
    static Foo & GetInstance() {
      try {
        boost::interprocess::managed_shared_memory
            segment(
              boost::interprocess::open_or_create,
              "FooSegment",
               65536);
        void_allocator_t alloc(segment.get_segment_manager());
        return *(segment.find_or_construct<Foo>(
                                              "FooObject")(alloc));

      } catch(std::exception & ex) {
        throw;
      }
   }
private:
     Foo(const void_allocator_t & a) {
         ...
         ...
     }
    Foo(const Foo &);
}

Of course somewhere deep in the guts of boost I get an error since
the Foo constructor is private. Who do I have to befriend in order
to make this scheme work ?

Thank you

O.