Show HN: LazyCode – C++14 composable, lazily evaluated map, filter, fold

And some user just opened an issue titled "Where are the tests?" and nothing else. Sure that's a valid concern, but that's the kind of attitude that would make me disable or lock GitHub issues in a project altogether (I have no relationship at all with this specific project).

Composable, lazily evaluated map, filter and fold in C90:

  This is the TXR Lisp interactive listener of TXR 204.
  Quit with :quit or Ctrl-D on empty line. Ctrl-X ? for cheatsheet.
  1> (take 15 [keep-if* oddp (mapcar* [dup *] (range 0))])
  (1 9 25 49 81 121 169 225 289 361 441 529 625 729 841)

Lazy keep-if: http://www.kylheku.com/cgit/txr/tree/lib.c?id=c310771b221125...

Lazy mapcar: http://www.kylheku.com/cgit/txr/tree/eval.c?id=c310771b22112...

Lazy range: http://www.kylheku.com/cgit/txr/tree/eval.c?id=c310771b22112...

P.S. dup generates a one-argument function which duplicates its argument into two places and calls another function. [dup *] gives us a squaring function, thus.

Is the pipe idiomatic c++ or is this an operator overload that requires readers to go learn a new piece of syntax?

Just read through the code, really easy to read. Nice post, thank you.