On 21/06/2010 21:51, Tomek Sowiński wrote:
Dnia 21-06-2010 o 21:57:49 Alix Pexton <alix.dot.pex...@gmail.dot.com>
napisał(a):
There is only one mention of lazy evaluation in the index and it
doesn't mention the lazy k/w at all. I seem to remember Andrei
dislikes it, but also that there is another way to get function params
to be evaluated lazily without using it.
Yeah, speaking of which - what happened to that proposal*?
*The proposal AFAIR was (correct me if wrong): if a function has a
parameterless delegate as a parameter, then on the call site any
expression in the delegate slot is implicitly turned into a delegate. I
think the delegate ought to be pure to make the magic happen.
Yeah, speaking of which - do/will we have pure delegates?
Tomek
This is the "trick" I was refering to, from a post by the programmer
formerly known as downs...
Amusing D facts: typesafe variadic arrays are lazy!
>
> Did you know the following code compiles?
>
> > > module test;
> > >
> > > import std.stdio;
> > >
> > > void Assert(bool cond, string delegate()[] dgs...) {
> > > debug if (!cond) {
> > > string str;
> > > foreach (dg; dgs) str ~= dg();
> > > throw new Exception(str);
> > > }
> > > }
> > >
> > > void main() {
> > > Assert(false, "O hai thar! ");
> > > }
>
> It's true! :)
A...
