lambda function with "capture by value"

[Adam D. Ruppe via Digitalmars-d-learn]

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).

You could also define a struct with members for the values you 
want, populate it, and pass one of its methods as your delegate. 
It is syntactically the heaviest but does give the most precise 
control (and you can pass the struct itself by value to avoid the 
memory allocation entirely if you want).

But for the loop, the pattern Temtaime wrote is how I'd prolly do 
it.