[Lazarus] Buffer dealocating between program and C++ library

[Leonardo M. Ramé]

On 2011-05-12 05:38:53 +0300, Kostas Michalopoulos wrote:
> I think that using a "@" before the function pointer variable returns the
> variable's address not the function's and that the "@" is needed only for
> functions, ie.
> 
> function Foo: TBar;
> 
> ...
> 
> FooRef:=@Foo;
> 
> will assign to FooRef the address of Foo, but
> 
> OtherFooRef:=@FooRef;
> 
> will try to assign to OtherFooRef the address of the FooRef variable (not
> the address stored in the FooRef variable - that is, the address of Foo) but
> fail at compilation time since OtherFooRef is supposed to be of type of
> whatever Foo is, not a pointer to that type.
> 
> However if you just check for nil this won't be noticed since by typing
> 
> if @FooRef <> nil ...
> 
> is like saying "if FooRef's address is not nil" instead of "if the address
> stored in FooRef is not nil". So basically you need to get rid of those
> "@"s.
> 
> Also personally i prefer to use the Assigned built-in function like
> 
> if Assigned(FooRef) ...
> 
> instead of
> 
> if FooRef <> nil ...
> 

Thanks. Fixed.

-- 
Leonardo M. Ramé
http://leonardorame.blogspot.com