Re: some trivial questions?

["Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>]

On 11/02/2017 02:19 AM, tclwarrior@gmail.com wrote:
> 
> i meant to say, why doesn't "use" imply "with"
> i think every time you insert
> a use, you will most definitely add a with

No. One reason they're separate is because you can "use" things that you can't 
"with".

> i think in a program with a large import (use) list of libraries, this can
> save many lines and looks cleaner

If you have long lists of use statements in your context clauses, then your code 
is unreadable so it doesn't matter.

There is a trade off between using and not using use in terms of readability. 
Judicious use of use can make code more readable, but too much use has the 
opposite effect. In pedagogic code I tend to avoid use completely. In real code 
I have no problem with use statements with fairly large scope for common and 
well known pkgs, such as Ada.Strings.Unbounded. For other pkgs I tend to prefer 
to limit use statements to fairly small scopes in which there are enough 
references to entities from the used pkg to make it worthwhile (for me, that 
tends to be about 5).

-- 
Jeff Carter
"I've seen projects fail miserably for blindly
applying the Agile catechism: we're Agile, we
don't need to stop and think, we just go ahead
and code!"
Bertrand Meyer
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