C++ Properties set get

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// 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.

C++ Properties set get

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原文地址：http://my.oschina.net/u/2256217/blog/378296