//: C10:MessengerDemo.cpp
#include <iostream>
#include <string>
using namespace std;
class Point { // A messenger
public:
int x, y, z; // Since it's just a carrier
Point(int xi, int yi, int zi) : x(xi), y(yi), z(zi)
{}
Point(const Point& p) : x(p.x), y(p.y), z(p.z)
{}
Point& operator=(const Point& rhs) {
x = rhs.x;
y = rhs.y;
z = rhs.z;
return *this;
}
friend ostream&
operator<<(ostream& os, const Point& p)
{
return os << "x=" << p.x
<< " y=" << p.y
<< " z=" << p.z;
}
};
class Vector { // Mathematical vector
public:
int magnitude, direction;
Vector(int m, int d) : magnitude(m), direction(d) {}
};
class Space {
public:
static Point translate(Point p, Vector v) {
// Copy-constructor prevents modifying the
original.
// A dummy calculation:
p.x += v.magnitude + v.direction;
p.y += v.magnitude + v.direction;
p.z += v.magnitude + v.direction;
return p;
}
};
int main() {
Point p1(1, 2, 3);
Point p2 = Space::translate(p1, Vector(11, 47));
cout << "p1: " << p1 <<
" p2: " << p2 << endl;
} ///:~
The code here is trivialized to prevent distractions.
Since the goal of a messenger is only to carry data, that
data is made public for easy access. However, you may also have reasons to make
the fields private.
