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authorAdrian Kummerlaender2015-02-17 22:47:56 +0100
committerAdrian Kummerlaender2015-02-17 22:47:56 +0100
commitaf5662781840ac45c21cbf14cbc7973bcf39d1da (patch)
tree9264a8e75ea7d87319f4298d47e97c47c58813fb /example/prime
parentc31731d0131c08c4ced091449764561eb3e5e2ab (diff)
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Reimplemented `TakeWhile` and `DropWhile` in terms of `ListIndex`
* new higher order list operation `ListIndex` returns the index of the first list element satisfying a given predicate function ** this enables finding the split index required for both `TakeWhile` and `DropWhile` ** actual list manipulation is then performed using lower order `Take` or `Drop` ** analogously to `list-index` in SRFI-1 ** added appropriate test case * added higher order predicate utility function `utility::predicate_assurance` ** as its name implies this function enables assuring that a value satisfies a given predicate *** if this is not the case a surrogate value is returned instead ** this is used to return a appropriate size value if the `ListIndex` call fails because no element satisfies its predicate ** `detail::predicate_negator` was moved from `Remove`'s implementation details into the newly introduced `utility` namespace *** as it is required by both `TakeWhile` and `DropWhile` in addition to `Remove` * continuation of 8e49cc6
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