C++实现C#的get，set属性操作

原文地址:http://www.codeproject.com/KB/cpp/properties.aspx

// 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;
}