On 24 June 2013 18:56, Jin Chen wrote:

I want to use boost::flyweight to do the dedupilcation of boost::interprocess::basic_string object. I wrote a small test program for that. In my program: The flyweight works fine with the interprocess::basic_string which uses the interprocess::allocator only with the default hashed_factory. The default hashed_factory is ideal except that it uses std::allocator instead of interprocess::allocator. I followed the http://www.boost.org/doc/libs/1_53_0/libs/flyweight/doc/tutorial/configurati... specifier of a custom hash_factory which can change its allocator to the interprocess one, but then got insanely long compiler error that is super hard to decode...

Right now, I don't know if only use interprocess::allocator in interprocess::basic_string alone will make the flyweight object be shared by multiple process, guess probably not... Then wonder whether that I didn't use the right syntax for custom hashed_factory or flyweight is compatible with boost::interprocess at all... If it is compatible, what's the right syntax for that? How shall I change my code?

Below is a test program attached. The code could compile now with flyweight's default hashed_factory. The goal is to make it compile with ShmStringHashedFactory which use the interprocess allocator.

I think the problem is that flyweight wants to default-construct the holder_arg, but interprocess allocators are not default constructible.