Question

I was reading through the boost documentation on tuples and came across the following valid tuple instantiation (A, B and C are some user defined classes):

tuple<A, int(*)(char, int), B(A::*)(C&), C>

I couldn’t understand what the types of the 2nd and 3rd parameters were. What exactly are the int(*)(char, int) and B(A::*)(C&) types?

Answer 1

int(*)(char, int)

Is a pointer to a function accepting a char and an int as parameter and returning an int.

B(A::*)(C&)

Is a pointer to a member function on an A object, returning B and accepting a reference to C as a parameter.