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
