Материал из C\C++ эксперт
Overload the "*" for "ob * int" and "int * ob".
#include <iostream>
using namespace std;
class MyClass {
int x, y;
public:
MyClass() {
x=0;
y=0;
}
MyClass(int i, int j) {
x=i;
y=j;
}
void getXY(int &i, int &j) {
i=x;
j=y;
}
friend MyClass operator*(MyClass object1, int i);
friend MyClass operator*(int i, MyClass object2);
};
// Overload * one way.
MyClass operator*(MyClass object1, int i)
{
MyClass temp;
temp.x = object1.x * i;
temp.y = object1.y * i;
return temp;
}
// Overload * another way.
MyClass operator*(int i, MyClass object2)
{
MyClass temp;
temp.x = object2.x * i;
temp.y = object2.y * i;
return temp;
}
int main()
{
MyClass object1(10, 10), object2;
int x, y;
object2 = object1 * 2; // ob * int
object2.getXY(x, y);
cout << "(object1*2) X: " << x << ", Y: " << y << endl;
object2 = 3 * object1; // int * ob
object2.getXY(x, y);
cout << "(3*object1) X: " << x << ", Y: " << y << endl;
return 0;
}
