Luigi Castelli

Now I want to create attributes to get and set a, b and c.

So, clearly, all three will have a custom set and get method, however I am confused, because obviously the typical way of doing it in this case doesn't work:

attr = attr_offset_new("a", _sym_long, attrflags, (method)myobj_a_get, (method)myobj_a_set, calcoffset(t_continuum, a));

So, what's the correct form to declare the attributes in this case ?

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typedef struct myData {
     UInt32 a;
     UInt32 b;
     UInt32 c;
} myData;

typedef struct _myobj {
    t_object   ob;
    void        *obex;
    void        *out;
    myData   *data;
} t_myobj;

attr = attr_offset_new("a", _sym_long, attrflags, (method)myobj_a_get, (method)myobj_a_set, calcoffset(t_continuum, a));
class_addattr(c, attr);

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setting-and-getting-attributes

On Jan 11, 2008, at 2:58 PM, Luigi Castelli wrote:

> So, clearly, all three will have a custom set and get method, 

> however I am confused, because obviously the typical way of doing 

> attr = attr_offset_new("a", _sym_long, attrflags, (method) 

> myobj_a_get, (method)myobj_a_set, calcoffset(t_continuum, a));

> So, what's the correct form to declare the attributes in this case ?

Just give an offset of zero. This is ignored if you have both custom 

attr = attr_offset_new("a", _sym_long, attrflags, (method) 

Alternately, you could avoid allocating your "myData" struct and 

simply embed in your object, which would permit default accessors-- i.e.

myData data;     // embed, not a pointer

// notice the data.a notation to use embedded structs.

attr = attr_offset_new("a", _sym_long, attrflags, (method)NULL, 

(method)NULL, calcoffset(t_myobj, data.a));

> So, clearly, all three will have a custom set and get method,  
> however I am confused, because obviously the typical way of doing  
> it in this case doesn't work:
>
> attr = attr_offset_new("a", _sym_long, attrflags, (method) 
> myobj_a_get, (method)myobj_a_set, calcoffset(t_continuum, a));
> class_addattr(c, attr);
>
> So, what's the correct form to declare the attributes in this case ?

Just give an offset of zero. This is ignored if you have both custom  
getter and setter--i.e.

attr = attr_offset_new("a", _sym_long, attrflags, (method) 
myobj_a_get, (method)myobj_a_set, 0);

Alternately, you could avoid allocating your "myData" struct and  
simply embed in your object, which would permit default accessors-- i.e.

typedef struct _myobj {
     t_object   ob;
     void        *obex;
     void        *out;
     myData   data; 	// embed, not a pointer
} t_myobj;

// notice the data.a notation to use embedded structs.
attr = attr_offset_new("a", _sym_long, attrflags, (method)NULL,  
(method)NULL, calcoffset(t_myobj, data.a));

Setting and getting attributes