get classname

[DJMaze]

Does anyone know how to retrieve the class name in ISO C++?

class FooBar {
public FooBar() { print(__CLASS__); } ???
}

[redhead]

hmm.. why would you need that...
The only time I can see this come in handy, is when dealing with languages, where variables can be of ANY type, so you'd want to do some sort of switch on the class.
At all times, unless you specific want it, the typechecker will make sure the class you're dealing with is of the correct type, so from my point of view it's a matter of redesigning your current situation.

[DJMaze]

BCB has a function named ClassNameIs and more of those.
Since i'm moving to a cross-platform ISO C++ enviornment i need similar tasks.

This because i create dragdrop handlers that run a action based on the class name.

For example i have a filelist box and a database table and they both contain filenames. To drop a filename from one of these classes i need to know the class type since both have different methods to fetch them.

filelist->selected_index
table->cell[row][col]

Maybe i should just add the proposed addition predefined identifier from C99

class Window
{
public:
static const char __class__[] = "class name";

[teknomage1]

maybe you should make a file_drop method that is polymophic for the various widgets you need to handle, that way the compiler can switch on the class name for you.

[DJMaze]

Doh that i didn't think of that, this cross-platform programming does blow my mind at the moment.
Thanks teknomage1

[teknomage1]

just glad I could be helpful for once!

[kyoryu]

The only problem with that is you either have to subclass each control for each instance on each form, or you end up with a TON of specific code in your generic UI element classes.

You should have access to a pointer to the specific objects on your form, either by some sort of functionality to get a pointer for an element by name, or by just having pointers to the elements directly. If you can get a pointer for a specific widget, you can check to see if the pointer for the object you're over is the same as the other one.

Additionally, if you want to see if an object is of a specific subclass, you can always use dynamic_cast< type >, assuming you've told it to compile with RTTI info.

What UI lib are you using?

[DJMaze]

I create many derivatives of my mywindow class.
Under Windows you need to register a WNDCLASS/WNDCLASSEX to get the mywindow to show.
Each instance has its own WNDPROC handler so things like buttons, grids, textedit classes are derivatives of the mywindow class.

If i need to find a certain window i use FindWindowEx and then SendMessage in some circumstances like disallowing second execution and pass on the commandline arguments.
BCB allowed me to do this easily because it compiled the instance name into the class.

TForm *MainWindow = new TForm();
FindWindowEx(NULL, NULL, "MainWindow", NULL);

Now in ansi i need to find a different way since finding a window/xwindow by the window title is not a option.