Jonathan Gopel eec00d8421 Implement copy_if_while and copy_if_until ...

Problem:
- There is no way to signal that a copy should proceed, selecting
  elements by a predicate until some condition is met. This is useful
  for patterns along the lines of "copy selected elements until there
  are n total elements in the output".

Solution:
- Introduce `copy_if_while()` and `copy_if_until()`.

2022-06-24 16:48:44 +00:00

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