c++ - specializing template member function to work in a different way for a special template class -

i have 2 classes class , class b both of them template classes member function in want act in special way when type of b , in normal way other types don't know how ?

template <class b> class b { private:   t m; public:   ...... member functions }  template <class t> class { private:   t var; public:   void dosomething(); }; template <class t> void a<t>::dosomething(){...........//implementation} template <class t>  void a<b<t>>::dosomething(){................//different implementation} 

you can specialize a way:

template <class t> class a<b<t>> {    // ... }; 

this instance of partial template specialization.

if refuse specialize entire class, can defer work a<t>::dosomething() function dosomethingfora<t>(a &) partially specialized, , possibly friend of a<t>.