Re^2: Using perlclass 'methods'

Replies are listed 'Best First'.
Re^3: Using perlclass 'methods' by hippo (Archbishop) on Jul 18, 2024 at 09:26 UTC
It seems to me this class feature is half-baked There is a reason why it is experimental. I understand the rationale given by those who have been advocating it but I only partially agree with it. There doesn't seem to be anybody suggesting that this new feature should be used in production. I am more than happy to keep using "classic" OOP and reach for one of the light frameworks available on CPAN on those occasions which warrant something a little more sugary. 🦛	[reply]
Re^4: Using perlclass 'methods' by bliako (Abbot) on Jul 18, 2024 at 12:50 UTC
oops sorry, i forgot it is experimental. Right.	[reply]
Re^3: Using perlclass 'methods' by Arunbear (Prior) on Jul 18, 2024 at 10:31 UTC
C++ and Java do that, but Python does not. Python was the main inspiration for Perl's OOP, and it also requires methods to be invoked via self, even within the class.	[reply]
Re^4: Using perlclass 'methods' by parv (Parson) on Jul 18, 2024 at 11:00 UTC
Python also requires the instance to refer to instance variables, unlike the examples in perlclass (as of now for v5.40.0). Read more... trivial Python class example; runs fine with v3.11 (1066 Bytes)	[reply] [d/l]
Re^3: Using perlclass 'methods' by haj (Vicar) on Jul 18, 2024 at 10:47 UTC
Simple things first: It is not the message `Undefined subroutine &main::ratio` because we are not in package `main` but in a `class Gear` where the method is defined. Whether Perl could imply `$self->ratio` when a method is called without an invocant is an interesting question. I guess it is a real challenge to the interpreter: It needs to figure out that `ratio` is a `method` and not a `sub`. As far as I know, this is not possible today. Whether this insurmountable, I can't say. Perhaps we should open an issue for Perl? And... of course the class feature is half baked. It is rather new and will take time to mature. For this issue, it behaves like all other OO systems in Perl. It could do different because it has the `class` and `method` contexts which the other systems don't have. Perhaps it will, at some point in the future?	[reply] [d/l] [select]
Re^4: Using perlclass 'methods' by bliako (Abbot) on Jul 18, 2024 at 12:54 UTC
`Simple things first: It is not the message Undefined subroutine &main: +:ratio because we are not in package main but in a class Gear where t +he method is defined.` [download] I assumed that if it does not find ratio() as a method in class then it goes to main looks there. Given that a method always requires its object (e.g. $self->ratio()) then I thought the reasonable thing would be to assume that this is a sub in main. Fair enough. (also I missed the experimental bit, so we shall see). Edit: Oh but it does not know that the object is not preceeding the method, it asusmes that the object is there, that's why it looks further ahead in the multiplicative factors.	[reply] [d/l]