// properties.h
#ifndef _PROPERTIES_H
#define _PROPERTIES_H
#define PROPERTY(t,n) __declspec( property
( put = property__set_##n, get = property__get_##n ) ) t n;\
typedef t property__tmp_type_##n
#define READONLY_PROPERTY(t,n) __declspec( property (get = property__get_##n) ) t n;\
typedef t property__tmp_type_##n
#define WRITEONLY_PROPERTY(t,n) __declspec( property (put = property__set_##n) ) t n;\
typedef t property__tmp_type_##n
#define GET(n) property__tmp_type_##n property__get_##n()
#define SET(n) void property__set_##n(const property__tmp_type_##n& value)
#endif /* _PROPERTIES_H */
// main.cpp
#include <iostream>
#include <math.h>
#include "properties.h"
class Vector2
{
public:
float x;
float y;
READONLY_PROPERTY(float, Length);
GET(Length)
{
return sqrt((x*x + y*y));
}
};
int main()
{
Vector2 vec;
vec.x = 1;
vec.y = 1;
std::cout << "Length of vector(" << vec.x << ", " << vec.y << ") = ";
std::cout << vec.Length << "\n"; // <--- property, not a function call
return 0;
}
The above code works with any Visual C++ version above 6.0. It does not need any additional dependencies -- as the section title states, it is a full example.