lambda function with "capture by value"

[Russel Winder via Digitalmars-d-learn]

On Sun, 2017-08-06 at 12:50 +0000, Adam D. Ruppe via Digitalmars-d-learn
wrote:
> On Saturday, 5 August 2017 at 19:58:08 UTC, Temtaime wrote:
> >  		(k){ dgs[k] = {writefln("%s", k); }; }(i);
> 
> Yeah, that's how I'd do it - make a function taking arguments by 
> value that return the delegate you actually want to store. (Also 
> use this pattern in Javascript btw for its `var`, though JS now 
> has `let` which works without this trick... and D is supposed to 
> work like JS `let` it is just buggy).
> 

Assuming I have understood the problem, this is the solution necessary in
Python: you have to use an enclosing function around the function so as to
capture the value using a parameter. I think Java requires the same.

-- 
Russel.
=============================================================================
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder at ekiga.net
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