Re: methods receive more arguments than defined?

[polifemo]

oh, right! The first argument is the object to receive the message, and the
second is the argument to the function. Thank you!

On Wed, Dec 21, 2022 at 12:34 PM Alexander Burger 
wrote:

> On Wed, Dec 21, 2022 at 05:14:15PM +0100, Frithjof Schulze wrote:
> > I can’t say much about other the rest of the code, but “This” is not an
> > argument, but a global variable managed by the system to have the
> current object
> > as a value:
>
> Right.
>
>
> > > On 21. Dec 2022, at 16:51, polifemo 
> wrote:
>
> > > What does this mean? Why is This being passed as an extra argument
> that is not
> > > in the method definition? When can you pass extra arguments and have
> it make
> > > sense?
>
> The syntax of message passing (i.e. method calls) in PicoLisp is
>
>(message> object arg1 arg2)
>
> Read as "message is sent to object".
>
> The object is not really passed as an *argument*, but is the target of the
> message sending, and is implicitly bound to the symbol 'This' while the
> method
> body runs.
>
> The method would be defined as
>
>(dm message> (Arg1 Arg2)
>   ... )
>
> ☺/ A!ex
>
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>

Re: methods receive more arguments than defined?

[Alexander Burger]

On Wed, Dec 21, 2022 at 05:14:15PM +0100, Frithjof Schulze wrote:
> I can’t say much about other the rest of the code, but “This” is not an
> argument, but a global variable managed by the system to have the current 
> object
> as a value:

Right.


> > On 21. Dec 2022, at 16:51, polifemo  wrote:

> > What does this mean? Why is This being passed as an extra argument that is 
> > not
> > in the method definition? When can you pass extra arguments and have it make
> > sense?

The syntax of message passing (i.e. method calls) in PicoLisp is

   (message> object arg1 arg2)

Read as "message is sent to object".

The object is not really passed as an *argument*, but is the target of the
message sending, and is implicitly bound to the symbol 'This' while the method
body runs.

The method would be defined as

   (dm message> (Arg1 Arg2)
  ... )

☺/ A!ex

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UNSUBSCRIBE: mailto:picolisp@software-lab.de?subject=Unsubscribe

Re: methods receive more arguments than defined?

[Frithjof Schulze]

Hi,

I can’t say much about other the rest of the code, but “This” is not an 
argument, but a global variable managed by the system to have the current 
object as a value:

https://software-lab.de/doc/ref.html#oop says:
> While a method body is being executed, the global variable This 
>  is set to the current object, 
> allowing the use of the short-cut property functions =: 
> , : 
>  and :: 
> .
> 

Cheers,
Frithjof


> On 21. Dec 2022, at 16:51, polifemo  wrote:
> 
> What does this mean? Why is This being passed as an extra argument that is 
> not in the method definition? When can you pass extra arguments and have it 
> make sense?