[boost] [type_erasure] How to have just one behavior from relaxed without inheriting the other behaviors

Subject: [boost] [type_erasure] How to have just one behavior from relaxed without inheriting the other behaviors
From: Felipe Magno de Almeida (felipe.m.almeida_at_[hidden])
Date: 2013-05-10 12:15:41

Hello,

I need to create a type_erasure::any with just this behavior from relaxed:

copy assignment of any uses the copy constructor if it can't use
assignable(either because
assignable is missing, or because the stored types do not match).

But without adding the other behaviors, is there a way to implement this?

Regards,
-- 
Felipe Magno de Almeida