#include <iostream>
using namespace std;
class three_d {
int x, y, z;
public:
three_d() { x = y = z = 0; }
three_d(int i, int j, int k) { x = i; y = j; z = k; }
// Add two three_d objects together.
three_d operator+(three_d rh_op);
// Add an integer to a three_d object.
three_d operator+(int rh_op);
// Subtract two three_d objects.
three_d operator-(three_d rh_op);
// Overload assignment.
three_d operator=(three_d rh_op);
// Overload ==.
bool operator==(three_d rh_op);
// Overload - for unary operation.
three_d operator-();
// Let the overloaded inserter be a friend.
friend ostream &operator<<(ostream &strm, three_d op);
// Let the overloaded + be a friend.
friend three_d operator+(int lh_op, three_d rh_op);
};
// Overload binary + so that corresponding coordinates are added.
three_d three_d::operator+(three_d rh_op)
{
three_d temp;
temp.x = x + rh_op.x;
temp.y = y + rh_op.y;
temp.z = z + rh_op.z;
return temp;
}
// Overload binary + so that an integer can be added to a three_d object.
three_d three_d::operator+(int rh_op)
{
three_d temp;
temp.x = x + rh_op;
temp.y = y + rh_op;
temp.z = z + rh_op;
return temp;
}
// Overload binary - so that corresponding coordinates are subtracted.
three_d three_d::operator-(three_d rh_op)
{
three_d temp;
temp.x = x - rh_op.x;
temp.y = y - rh_op.y;
temp.z = z - rh_op.z;
return temp;
}
// Overload unary - so that it negates the coordinates.
three_d three_d::operator-()
{
three_d temp;
temp.x = -x;
temp.y = -y;
temp.z = -z;
return temp;
}
// Overload assignment for three_d.
three_d three_d::operator=(three_d rh_op)
{
x = rh_op.x;
y = rh_op.y;
z = rh_op.z;
return *this;
}
// Overload == for a three_d object.
bool three_d::operator==(three_d rh_op)
{
if( (x == rh_op.x) && (y == rh_op.y) && (z == rh_op.z) )
return true;
return false;
}
// These are non-member operator functions.
//
// Overload << as a custom inserter for three_d objects.
ostream &operator<<(ostream &strm, three_d op) {
strm << op.x << ", " << op.y << ", " << op.z << endl;
return strm;
}
// Overload + for int + obj.
three_d operator+(int lh_op, three_d rh_op) {
three_d temp;
temp.x = lh_op + rh_op.x;
temp.y = lh_op + rh_op.y;
temp.z = lh_op + rh_op.z;
return temp;
}
int main()
{
three_d objA(1, 2, 3), objB(10, 10, 10), objC;
cout << "This is objA: " << objA;
cout << "This is objB: " << objB;
// Obtain the negation of objA.
objC = -objA;
cout << "This is -objA: " << objC;
// Add objA and objB together.
objC = objA + objB;
cout << "objA + objB: " << objC;
// Subtract objB from objA.
objC = objA - objB;
cout << "objA - objB: " << objC;
// Add obj + int.
objC = objA + 10;
cout << "objA + 10: " << objC;
// Add int + obj.
objC = 100 + objA;
cout << "100 + objA: " << objC;
// Compare two objects.
if(objA == objB) cout << "objA is equal to objB.\n";
else cout << "objA is not equal to objB.\n";
return 0;
}
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