[boost] [c++-sig] A question regarding arguments bindings

Hi, My question is regarding the default behavior of the compiler when there is mismatch in the argument type between binding declaration and function declaration. By default no warning is generated. Consider following example: class A{ public: A(const B&); }; In wrapper, if by mistake (which I made in my code), i write class_<A>("A", init<B>) ; The compiler does not complain about no constructor found. Instead for reasons, beyond my understanding of boost.python, B get passed by value. My question why doesn't compiler issue at least a warning. Needless to say i am new to boost.python. My apologies if this is something trivial or well known. Thanks sandeep