Help on set and get a object copy

[tonnot]

I dont know if this can be done.-
I have a method to set a copy of an object (with some structs instances an vectors inside it)

Inside the class I have to do the work, I have a private pointer based object_undo:

ClassX *  the_object_undo;
 
void w_set_undo(CLass the_object)
{   the_object_undo = &the_object }
 
ClassX *  w_get_undo(){ return the_object_undo}

ClassX *  the_object_undo;

void w_set_undo(CLass the_object)
{   the_object_undo = &the_object }

ClassX *  w_get_undo(){ return the_object_undo}

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I have a original_object pointer based in another class.
I call

w_set_undo(*original_object);

w_set_undo(*original_object);

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Ok, Inside w_set_undo, if I check some properties of 'the_object_undo' they are correct. However, inside w_get_undo, they are not ( so I cant to retunr a wrong object). What is happen ? A solution ?

Thanks.

[wysota]

The code is incorrect. The solution is to pass a pointer or store the object.

[tonnot]

I want to store the object.
The object is pointer based, so to pass to the function i have to write *object, isn't it ?
And.... the function set_undo_object works
(I can play with the object received as copy )

Please help....

[wysota]

I want to store the object.
The object is pointer based, so to pass to the function i have to write *object, isn't it ?

The two sentences you have written above are contradictory. Think what you really want.

[tonnot]

Solved
Inside set_undo I must to have :

void w_set_undo(CLassX the_object)
{
object_undo = new ClassX() ;  (the object must exist before)
*object_undo = the_object }

void w_set_undo(CLassX the_object)
{
object_undo = new ClassX() ;  (the object must exist before)
*object_undo = the_object }

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It seems that works !
What do you think ?
Thanks

[wysota]

It makes little sense to do that.

[high_flyer]

As wysota said, you code makes no functional sense, and unless you are taking care of your 'object_undo' pointer (which doesn't look like you do), you are leaking memory as well.
If what you want is an "undo" functionality, Qt has a built in framework for that:
http://doc.qt.nokia.com/latest/qundo.html