12-Oct-2013 22:00, Artem Tarasov пишет:
We have great support for input ranges and thus for the pull-based model
of programming, but the standard library offers almost nothing for the
push-based model :( It utterly lacks tools for composing output ranges.
What I'd like to see working is this:
import std.stdio, std.algorithm, std.range;
void main() {
auto printer = fork!(n => n % 2)(sink!(n => writeln("odd: ", n)),
sink!(n =>
writeln("even: ", n)))
.filter!(n => n != 16)
.map!(n => n * n);
copy(iota(10), printer);
}
http://dpaste.dzfl.pl/612a8ad6
Exactly, I even recall coming up with the same ideas on this NG. Except
that I find that non-predicative fork is interesting too - just forward
the same stuff to N sinks. For example, calculate a hash of a message as
it's being sent to the network.
Moreover a lot of algorithms can come with *To/*Into suffix and forward
stuff into an output range. IIRC I was behind that idea some time ago
but got distracted with time, some things made it through though:
http://dlang.org/phobos/std_array.html#.replaceInto
(+ new API for std.regex has similar constructs with *Into suffix)
IMO you are more then welcome to champion additions in this direction.
--
Dmitry Olshansky