On 24/03/18 16:20, Ondrej Pokorny wrote:
On 24.03.2018 15:46, Alexander Grotewohl wrote:
The patch is to put them on separate lines. Preferably with meaningful
comments for each. If FPC was changed at the whim of every programmer
we'd end up with a huge mess that no longer resembles pascal.
Please tell me who decides about the borderline between whim and
usefulness.
It's in the eye of the beholder. Personally, I don't think it's a good
extension either. Variable lists followed by a type are a fundamental
part of the language and appear everywhere (variable lists, field
declarations, parameter lists). On the other hand, a single constant
that initialises multiple variables in a single statement does not exist
anywhere else in the language. Therefore, adding it in one place would
definitely be the wrong way to go about it. You'd also have to support
it at least for record field initialisers and default parameters.
When seeing that compound initialisation/declaration statement for the
first time, my first reflex was to interpret the initialisation as only
applying to the final variable, no matter how useless that would make
the language extension. As someone else posted, even languages that do
allow multiple variables to be assigned in a single statement use a
different syntax than the one to indicate that all variables have the
same type. Having to switch your frame of mind when reading one
particular family of expressions is bad for productivity. Everything
should be as consistent as possible.
In the end, pretty much every extra language feature makes both the
compiler and the language more complex. Therefore, I think the question
for language extensions should never be "is there a good reason not to
allow this", but "is it really necessary to allow this"? I.e., does it
make things much easier to read, less error prone to write, and/or
increase productivity a lot. I don't think the answer is "yes" for any
of these questions as far as this extension is concerned.
Jonas
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