Storagetype?

I''ve implemented a messagesystem for objects to send stuff to each other, but i''ve got a problem with how to store parameters. For the moment im using void** to store and an int* to save the size of each void* in...but im wondering if there isn''t any easier way. I have to be able to save anything...pointers, objects, pods..so i dont think any of the stl-containers would be useful :/