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🔥 AnyEquatable.

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This commit is contained in:
Rob Rix 2015-10-06 19:20:16 -04:00
parent 939a714807
commit 1059a00db0
2 changed files with 0 additions and 24 deletions
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4
prototype/Doubt.xcodeproj/project.pbxproj
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@ -22,7 +22,6 @@
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20
prototype/Doubt/AnyEquatable.swift
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@ -1,20 +0,0 @@
/// An Equatable instance for any type for which you can provide an equality function.
///
/// This can enable equating [T] where T does not conform to Equatable, by first mapping to [AnyEquatable<T>] and then comparing with ==.
public enum AnyEquatable<A>: Equatable {
case External(A, (A, A) -> Bool)
public var value: A {
switch self {
case let .External(a, _):
return a
}
}
}
public func == <A> (left: AnyEquatable<A>, right: AnyEquatable<A>) -> Bool {
switch (left, right) {
case let (.External(a, eq), .External(b, _)):
return eq(a, b)
}
}