> We tend to avoid local write-once-read-once local variables, i.e. we tend to
> prefer
>
> {
> setSize(optimalSize());
> }
>
> to
>
> {
> CGSize newSize = optimalSize();
> setSize(newSize);
> }
>
> But the up- and down-sides of this are the same as those of using auto.
I think I basically agree with Phil here, and slightly disagree with your
premise that the upsides and downsides are truly the same:
(1) The downside to explicit declaration in this case is greater because it
requires an extra line of code.
(2) The upside to explicit declaration in this case is lesser because the value
is used only once, and in a guaranteed trivial way (just passing it somewhere
else).
> Do you think we should also encourage use of write-once-read-once locals for
> the same reasons?
No, not in general.
However, in rare cases, I think the balance shifts, and I do prefer an extra
line of code for write-once-read-once variables. For example:
int documentWidth = screenWidth(); // The size of the document is equal to the
size of the screen because…
layout(documentWidth);
In this case, the caller of screenWidth() is changing its meaning, and I
slightly prefer to call that out.
Geoff
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