[fpc-devel] C library header - var vs pointer for function arguments

[Michael Van Canneyt]

On Thu, 4 Aug 2022, gabor via fpc-devel wrote:

> I'd like to provide some fixes for packages that are headers for c 
> libraries. When and should I use the "var" argument for function 
> arguments that return a value, or should I always use pointers 
> (excluding arguments that might accept nil)?
>
> Eg:
> function Foo(var A: Integer): Integer;
> vs
> function Foo(A: PInteger): Integer;

It's best to use pointers, but you can always provide overloads with var
arguments.

And as Dmitry Boyarintsev pointed out, don't change existing signatures for
backwards compatibility.

Michael.