1 files changed, 35 insertions, 0 deletions
diff --git a/Firestore/Source/Model/FSTDocumentKeySet.h b/Firestore/Source/Model/FSTDocumentKeySet.h
new file mode 100644
index 0000000..7352985
--- /dev/null
+++ b/Firestore/Source/Model/FSTDocumentKeySet.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+#import "FSTImmutableSortedSet.h"
+
+@class FSTDocumentKey;
+
+NS_ASSUME_NONNULL_BEGIN
+
+/** Convenience type for a set of keys, since they are so common. */
+typedef FSTImmutableSortedSet<FSTDocumentKey *> FSTDocumentKeySet;
+
+@interface FSTImmutableSortedSet (FSTDocumentKey)
+
+/** Returns a new set using the DocumentKeyComparator. */
++ (FSTDocumentKeySet *)keySet;
+
+@end
+
+NS_ASSUME_NONNULL_END