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AnyEquatable.

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This commit is contained in:
Rob Rix 2015-10-01 10:28:14 -04:00
parent 279aab6530
commit 079b3a479e
2 changed files with 14 additions and 0 deletions
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4
prototype/Doubt.xcodeproj/project.pbxproj
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@ -22,6 +22,7 @@
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@ -100,6 +101,7 @@
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@ -208,6 +210,7 @@
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);
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@ -396,6 +399,7 @@
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D45A36CD1BBC75DF00BE3DDE /* Info.swift in Sources */,
D4AAE5461B5AE2D0004E581F /* Parse.swift in Sources */,

10
prototype/Doubt/AnyEquatable.swift Normal file
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@ -0,0 +1,10 @@
public enum AnyEquatable<A>: Equatable {
case External(A, (A, A) -> Bool)
}
public func == <A> (left: AnyEquatable<A>, right: AnyEquatable<A>) -> Bool {
switch (left, right) {
case let (.External(a, eq), .External(b, _)):
return eq(left, right)
}
}