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bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value
From: |
Andreas Röhler |
Subject: |
bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value |
Date: |
Tue, 11 Feb 2014 11:52:23 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 |
Am 11.02.2014 05:01, schrieb Stefan Monnier:
These are NOT side-effect functions. They modify nothing except
the cursor position.
How is that not a side-effect?
You are clearly arguing for the sake of arguing, now.
Not at all.
Motion functions are not what is typically meant by a side-effect
function.
Says you. For me (and most definitions of side-effects I've ever seen),
a side-effecting function is something like a function where the calls
can't simply be replaced by their return value.
Can't see a logic link between a possible return value and the notion of
side-effect.
It all depends from the purpose of the function.
Avoiding side-effects as a goal tries to avoid complexity.
While asking for (documented) return-values some times ago, being well aware
these might constitute side-effects - but must not.
I.e. if a move-function reaches position, the buffer state is changed, but
that's not a side effect, as it's the purpose.
If this function returns position for possibly receiving functions, would
consider it a side-effect.
So if avoiding complexity is a goal, delivering a smart language is another one.
Not all side-effects are of same severity or same urgence to avoid.
Remains to decide. In case of move-functions, being in favor of returning
position reached.
Documenting return-values is another --quite useful-- thing.
Cheers,
Andreas
- bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value, (continued)
- bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value, Andreas Röhler, 2014/02/11
- bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value, Eli Zaretskii, 2014/02/11
- bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value, Drew Adams, 2014/02/11
- bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value, Andreas Röhler, 2014/02/11
- bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value, Juanma Barranquero, 2014/02/11
- bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value, Glenn Morris, 2014/02/10
- bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value, Stefan Monnier, 2014/02/10
- bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value,
Andreas Röhler <=
- bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value, Nicolas Richard, 2014/02/11
- bug#15117: 24.3.50; doc of `(forward|backward)-*': state return value, Andreas Röhler, 2014/02/11