Port FSTDocumentKeySet to C++ DocumentKeySet (#1229)

* Define a Comparator for DocumentKey

* Automated migration from FSTDocumentKeySet to DocumentKeySet

* Manual fixups for DocumentKeySet

* Delete FSTDocumentKeySet

1 files changed, 4 insertions, 3 deletions

diff --git a/Firestore/Source/Local/FSTMemoryQueryCache.mm b/Firestore/Source/Local/FSTMemoryQueryCache.mm
index 57c2703..991faa9 100644
--- a/Firestore/Source/Local/FSTMemoryQueryCache.mm
+++ b/Firestore/Source/Local/FSTMemoryQueryCache.mm
@@ -26,6 +26,7 @@
 #include "Firestore/core/src/firebase/firestore/model/snapshot_version.h"
 
 using firebase::firestore::model::SnapshotVersion;
+using firebase::firestore::model::DocumentKeySet;
 
 NS_ASSUME_NONNULL_BEGIN
 
@@ -116,11 +117,11 @@ NS_ASSUME_NONNULL_BEGIN
 
 #pragma mark Reference tracking
 
-- (void)addMatchingKeys:(FSTDocumentKeySet *)keys forTargetID:(FSTTargetID)targetID {
+- (void)addMatchingKeys:(const DocumentKeySet &)keys forTargetID:(FSTTargetID)targetID {
   [self.references addReferencesToKeys:keys forID:targetID];
 }
 
-- (void)removeMatchingKeys:(FSTDocumentKeySet *)keys forTargetID:(FSTTargetID)targetID {
+- (void)removeMatchingKeys:(const DocumentKeySet &)keys forTargetID:(FSTTargetID)targetID {
   [self.references removeReferencesToKeys:keys forID:targetID];
 }
 
@@ -128,7 +129,7 @@ NS_ASSUME_NONNULL_BEGIN
   [self.references removeReferencesForID:targetID];
 }
 
-- (FSTDocumentKeySet *)matchingKeysForTargetID:(FSTTargetID)targetID {
+- (DocumentKeySet)matchingKeysForTargetID:(FSTTargetID)targetID {
   return [self.references referencedKeysForID:targetID];
 }