C++ macro '##' doesn't work after '->' operator

Question

I have a shared_ptr object x, which has get and set methods as follows:

x->a_value();
x->set_a_value();
x->b_value();
x->set_b_value();
         


        

Answer 1

What it says on the tin: ->a is not a single, valid preprocessor token: it's two tokens. You do not need to paste here.

#define MAC(type) \
  x->type##_value();