Listing 3 Illustrates an implicit user-defined conversion
// convert3.cpp #include <iostream. h> struct A { double x; A(double d) { cout << "A::A(double)" << endl; x = d; } }; void f(const A& a) { cout << "f: "<< a.x << endl; } main() { A a(1); f(a); f(2); return 0; } // Output: A::A(double) f: 1 A::A(double) f:2 // End of File