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Parameterized Optional equality.

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This commit is contained in:
Rob Rix 2015-10-02 16:48:44 -04:00
parent 40291e2715
commit 9a19d477df
1 changed files with 13 additions and 0 deletions
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13
prototype/Doubt/Prelude.swift
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@ -12,3 +12,16 @@ func >>> <T, U, V> (f: T -> U, g: U -> V) -> T -> V {
return { g(f($0)) }
}
extension Optional {
static func equals(param: (Wrapped, Wrapped) -> Bool)(_ left: Wrapped?, _ right: Wrapped?) -> Bool {
switch (left, right) {
case let (.Some(a), .Some(b)):
return param(a, b)
case (.None, .None):
return true
default:
return false
}
}
}