ch5.8.cc

C++ source code for book-C++ and Object Oriented Numeric computing for scientists and engineers

#include <iostream>

class X {   
  double g(double a) { return a*a + 5.0; }
  double h(double a) { return a - 13; }
public:            
  void test(X*, X);
};

typedef double (X::*pf)(double);       // pointer to member

void X::test(X* p, X q) {
  double g5 = p->g(5.0);               // call directly
  double h5 = p->h(5.0);               // call directly
  double g10 = q.g(10);               // call directly
  double h10 = q.h(10);               // call directly

  std::cout << "g5 = " << g5 << "\n ";
  std::cout << "h5 = " << h5 << "\n ";
  std::cout << "g10 = " << g10 << "\n ";
  std::cout << "h10 = " << h10 << "\n ";

  pf m1 = &X::g;
  pf m2 = &X::h;
  double g6 = (p->*m1)(6.0);           // call through pointer to member
  double h6 = (p->*m2)(6.0);           // call through pointer to member
  double g12 = (q.*m1)(12);           // call through pointer to member
  double h12 = (q.*m2)(12);           // call through pointer to member

  std::cout << "g6 = " << g6 << "\n ";
  std::cout << "h6 = " << h6 << "\n ";
  std::cout << "g12 = " << g12 << "\n ";
  std::cout << "h12 = " << h12 << "\n";
}

int main(){

  X i;
  X ii;
  i.test(&i, i);

}