Equivalent to Python with Statement

[Seb]

On Wednesday, 28 February 2018 at 21:47:40 UTC, Cym13 wrote:
> On Tuesday, 27 February 2018 at 16:17:20 UTC, Jonathan wrote:
>> I know Python's `with` statement can be used to have an 
>> automatic close action:
>> ```
>>     with open("x.txt") as file:
>>         #do something with file
>>     #`file.close()` called automatically
>> ```
>>
>> I know D's `with` statement does something different but is 
>> there some sort of equivalent?
>
> Others have discussed that particular case at length, but to 
> provide a more generic answer the correct way to translate a 
> python context manager is to use scope(out):
>
>     { // Scope restriction similar to with's block
>         auto f = File("x.txt");
>         scope(out) f.close();   // closes f on scope exit no 
> matter what
>
>         /* do stuff with f */
>     }
>
> This accurately reproduces the behaviour of python's with 
> although it's less automatic.

I know that I am repeating myself, but manually closing the file 
isn't needed in D. It's refCounted and will be closed 
automatically once the scope is left. That's why 
`with(File("AAA","w"))` works in D.