Breaking out of multiple loops

[Jose Armando Garcia]

On Sep 5, 2012, at 6:13, "Regan Heath" <regan at netmail.co.nz> wrote:

> On Wed, 05 Sep 2012 13:55:32 +0100, monarch_dodra <monarchdodra at gmail.com 
> > wrote:
>
>> On Wednesday, 5 September 2012 at 12:43:26 UTC, Piotr Szturmaj wrote:
>>> Michel Colman wrote:
>>>> I have a very simple suggestion for breaking out of nested loops.
>>>
>>> I think it's already there: http://dlang.org/statement.html#BreakStatement
>>>
>>> "If break is followed by Identifier, the Identifier must be the  
>>> label of an enclosing while, for, do or switch statement, and that  
>>> statement is exited. It is an error if there is no such statement."
>>
>> I really wish there was a simple "break from current scope"  
>> command. It would be kinda like "goto end of scope", just cleaner...
>
> You can lodge an enhancement request, example code:
>
> void main()
> {
>    label: {
>      // ..code..
>      writefln("code1");
>      writefln("break..");
>      break label;  // jumps to "here:"
>      // ..code..
>      writefln("code2");
>    }
>    // break lands here
>    writefln("here");
> }
>
> Current error:
>  test.d(nn): Error: enclosing label 'label' for break not found
>
> In fact, as any BlockStatement can be labeled you can argue any  
> BlockStatement label should be 'breakable'.
>

Haven't tried it but this maybe implementable using templates, try and  
catch.

I say this because Scala, being a "functional" language implements  
this as a library using closure, high order function, try, catch and  
throw. Maybe a few other features.

-jose
> R
>
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