How to get the pointer of "this" ?

[bauss]

On Sunday, 24 May 2020 at 17:05:16 UTC, Vinod K Chandran wrote:
> Hi all,
> I have a class like this.
> class Button : Control {
> 	...
> 	HWND createButton(){
> 		...
> 		SetWindowSubclass(this.mHandle, SUBCLASSPROC(&btnWndProc), 
> UINT_PTR(subClsID), cast(DWORD_PTR) this);
> 	}
> }
>
> But compiler says that - "Error: 'this' is not an lvalue and 
> cannot be modified"
> I've seen many cpp code which uses pointer to 'this' as the 
> last parameter in SetWindowSubclass(). Is there something wrong 
> with my approach ?

I think your issue might be elsewhere because casting this should 
be fine and it should not complain about that in your given code.

At least you should be able to pass this to another function or 
even cast it.

Please show the full code and the full error which gives you the 
stacktrace of where it's called and from where.