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[ListMonitor] Use dynamicCast() to cast fetchedObjects to [T]? without checking the type.

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Type checking takes a time. So there is a performance problem when casting a large number of fetched objects to an array of a certain type using the operator `as?`.
This commit is contained in:
Ruslan Skorb
2017-03-24 21:30:46 +02:00
parent 92890d1e1d
commit f055c54a66
1 changed files with 2 additions and 2 deletions
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4
Sources/Observing/ListMonitor.swift
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@@ -202,7 +202,7 @@ public final class ListMonitor<T: NSManagedObject>: Hashable {
!self.isPendingRefetch || Thread.isMainThread, !self.isPendingRefetch || Thread.isMainThread,
"Attempted to access a \(cs_typeName(self)) outside the main thread while a refetch is in progress." "Attempted to access a \(cs_typeName(self)) outside the main thread while a refetch is in progress."
) )
return (self.fetchedResultsController.fetchedObjects as? [T]) ?? [] return self.fetchedResultsController.dynamicCast().fetchedObjects ?? []
} }
/** /**
@@ -371,7 +371,7 @@ public final class ListMonitor<T: NSManagedObject>: Hashable {
!self.isPendingRefetch || Thread.isMainThread, !self.isPendingRefetch || Thread.isMainThread,
"Attempted to access a \(cs_typeName(self)) outside the main thread while a refetch is in progress." "Attempted to access a \(cs_typeName(self)) outside the main thread while a refetch is in progress."
) )
return (self.fetchedResultsController.fetchedObjects as? [T] ?? []).index(of: object) return (self.fetchedResultsController.dynamicCast().fetchedObjects ?? []).index(of: object)
} }
/** /**