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Documented Failable<MutableCollection, T>.partition(by:) and .swapAt(_:) methods. Added range subscript

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Caleb Kleveter 2018-12-10 12:12:10 -06:00
parent 676c9cc24b
commit 8ac9fd39a0
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1 changed files with 20 additions and 0 deletions
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20
Sources/Validation/Failable+Helpers/Failable+Collection.swift
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@ -57,6 +57,25 @@ extension Failable where T: MutableCollection {
}
}
/// See [`MutableCollection.[]`](https://developer.apple.com/documentation/swift/mutablecollection/2965317-subscript).
///
/// To validate the new array, the instance is copied and mutated, then the validation is run on the mutated instance.
/// If the validation succeeds, the mutated value is assigned to the current instance. If the validation fails, the set silently fails.
public subscript(position: Range<T.Index>) -> T.SubSequence {
get {
return self.value[position]
}
set(newValue) {
var copy = self
copy.value[position] = newValue
do {
try self <~ copy.value
} catch {}
}
}
/// See [`MutableCollection.partition(by:)`](https://developer.apple.com/documentation/swift/mutablecollection/3018221-partition).
public mutating func partition(by belongsInSecondPartition: (Element) throws -> Bool)throws -> Index {
var copy = self.value
let index = try copy.partition(by: belongsInSecondPartition)
@ -65,6 +84,7 @@ extension Failable where T: MutableCollection {
return index
}
/// See [`MutableCollection.swapAt(_:_:)`](https://developer.apple.com/documentation/swift/mutablecollection/3018230-swapat).
public mutating func swapAt(_ i: Index, _ j: Index)throws {
var copy = self.value
copy.swapAt(i, j)