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Implement copy_if_while and copy_if_until

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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()`.
This commit is contained in:
Jonathan Gopel
2022-05-05 16:59:08 -06:00
parent da8ea581eb
commit eec00d8421
3 changed files with 328 additions and 7 deletions
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14
doc/algorithm.qbk
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@ -206,14 +206,24 @@ See below
[section:copy_until copy_until ]
[*[^[link header.boost.algorithm.cxx11.copy_if_hpp copy_until] ] ]
Copy all the elements at the start of the input range that do not satisfy the predicate to the output range
Copy all the elements from the start of the input range to the output range until the predicate is satisfied
[endsect:copy_until]
[section:copy_while copy_while ]
[*[^[link header.boost.algorithm.cxx11.copy_if_hpp copy_while] ] ]
Copy all the elements at the start of the input range that satisfy the predicate to the output range
Copy all the elements from the start of the input range to the output range while the predicate is satisfied
[endsect:copy_while]
[section:copy_if_until copy_if_until ]
[*[^[link header.boost.algorithm.cxx11.copy_if_hpp copy_if_until ] ]
Copy all elements that satisfy the element predicate from the start of the input range to the output range until the termination predicate is satisfied
[endsect:copy_if_until]
[section:copy_if_while copy_if_while ]
[*[^[link header.boost.algorithm.cxx11.copy_if_hpp copy_if_while ] ]
Copy all elements that satisfy the element predicate from the start of the input range to the output range while the termination predicate is satisfied
[endsect:copy_if_while]
[section:iota_n iota_n ]
[*[^[link boost.algorithm.iota_n iota_n] ] ]
Write a sequence of n increasing values to an output iterator