about "with statement"

[bearophile]

khurshid:

> D language have like Pascal/Delphi  "with statement",  which 
> very useful for writing readable code.

It's a quite useful statement, especially with enumerations or 
associative array literals, to avoid repeating many times their 
name:

switch (en) with (MyEnum) {
   case foo: ...
   case bar: ...
}

int[MyEnum] myAA;
with (MyEnum) {
   myAA = [foo: ...,
           bar: ...,
          ];
}

Instead of:

switch (en) {
   case MyEnum.foo: ...
   case MyEnum.bar: ...
}

int[MyEnum] myAA = [
   MyEnum.foo: ...,
   MyEnum.bar: ...,
];

And D with is better than Pascal one, because it removes its main 
pitfall.


> Maybe I'm wrong, but, I never saw  where using this statement 
> in phobos  source codes, what problem using this statement?

I think it's not used much in Phobos because it's a statement not 
present in C/C++, and D/Phobos devs are more used to C/C++ 
languages than to Pascal/Ada ones.

Bye,
bearophile