getter/setter generation with multiline stringfy macro

问题

I have recently seen a cool c style macro play which generates automatically the setters/getters for the class. So this is what I am talking about.

#define BOOL_VARIABLE(name)\
    void set##name(bool iValue)\
    {\
        // set the boolean
    }\ 
    const bool get##name() const\
    {\
       // get the boolean
    }

    BOOL_VARIABLE(AVariableName); // and calling them inside the class

and now think about one of them for all string/int/double etc variables

I am aware of all avoid-macro usage type of remarks but I actually find it pretty cool because long getter/setter lines are really disturbing me. Can you think of anything that might go wrong with this approach.

回答1:

The following* is a better option (with type also as a parameter). However, I would avoid implementations to take full advantage of accessor methods, as mentioned by @justin. Your compiler will generate errors if you forget to implement them.

*http://cppkid.wordpress.com/2008/09/04/getters-and-setters-for-a-class-using-a-macro/

#define GETSET(type, var) \         
    private: \         
       type _##var; \         
    public: \         
       type Get##var() \         
       {\         
          return _##var; \         
       }\
       void Set##var(type val) \         
       {\         
          _##var = val; \         
       }

回答2:

There is not a strong benefit over direct member access -- Why should it exist in the first place?

Typically, the body of the accessor is a good place for validation of inputs and state of this, but the macro does not allow that so it really does not contribute "enough" to use (IMO) across a codebase. In typical programs, there will also often be enough variation to not justify its usage. It certainly should not be the only way to declare a variable and/or its accessors.

Just so there is no confusion: I am all for accessors and encapsulation. This macro just locks you out of their more important benefits.

来源：https://stackoverflow.com/questions/21412266/getter-setter-generation-with-multiline-stringfy-macro

标签

c++

macros

getter-setter