Re: template-based test function for unary operators?

Well, the template "mess" does not quite work out.

Below is the code. After that, the error messages.

--------------------------------------------------------

class A {
  int f (int c) { return c; }
  int f (const char c) { return c; }
  A& operator+= (A const& a) { return *this; }
};

template <class rettype, class argtype, class btype>
bool unary_op_test(rettype (*func)(argtype),
btype self, argtype arg, rettype expect)
{
   rettype rv = self.func(arg);
   bool result = (rv == expect);
   return result;
}

int main ()
{
  A aa;
  int (A::*p1)(int) = &A::f;
  A& (A::*p2)(A const&) = &A::operator+=;
  unary_op_test<int,int,A&>(p1, aa, 12, 12);
  unary_op_test<A&,A&,A&>(p2, aa, aa, aa);
  unary_op_test<A&,const A&,A&>(p2, aa, aa, aa);
}