Re: [Boost-users] [multi_index] multi index container with Managed C++

Parag Gadkari ha escrito:

I am having trouble while using multi index container with the "managed c++" component. Here is the typedef that the compiler won't accept.

typedef multi_index_container< gcroot,

indexed_by< ordered_unique< identity > >, ordered_non_unique , int,&interface_entity::entity_drawingid

...

...

,

entity_collection;

The real deal is with the member template which needs the address of member variable of the interface_entity class. Entity class is an abstract Managed type (specified with __gc), and it is not allowed to take the address of a non-static member of a managed type.

Does anybody know of a workaround?

Hello Parag, A simple solution is to write a custom key extractor as described at: http://tinyurl.com/l3g6u In your particular case, the extractor would look like the following (warning, uncompiled): struct entity_drawingid_extractor { typedef int result_type; result_type operator()(const gcroot& x)const { return x->entity_drawingid; } }; Does this help? Is this the only problem you've stumbled upon when using B.MI with Managed C++? I'm curious as reports of usage of Boost libs in .NET C++-like languages are scarce. Joaquín M López Muñoz Telefóinca, Investigación y Desarrollo