port C++ DocumentKey to the rest of Firestore code (#977)

* port C++ DocumentKey to API's and Core's

* address changes

* address changes

* fix Hash return types

1 files changed, 5 insertions, 2 deletions

diff --git a/Firestore/Source/Core/FSTViewSnapshot.mm b/Firestore/Source/Core/FSTViewSnapshot.mm
index e60b785..ae366fb 100644
--- a/Firestore/Source/Core/FSTViewSnapshot.mm
+++ b/Firestore/Source/Core/FSTViewSnapshot.mm
@@ -18,11 +18,14 @@
 
 #import "Firestore/Source/Core/FSTQuery.h"
 #import "Firestore/Source/Model/FSTDocument.h"
-#import "Firestore/Source/Model/FSTDocumentKey.h"
 #import "Firestore/Source/Model/FSTDocumentSet.h"
 #import "Firestore/Source/Util/FSTAssert.h"
 #import "Firestore/third_party/Immutable/FSTImmutableSortedDictionary.h"
 
+#include "Firestore/core/src/firebase/firestore/model/document_key.h"
+
+using firebase::firestore::model::DocumentKey;
+
 NS_ASSUME_NONNULL_BEGIN
 
 #pragma mark - FSTDocumentViewChange
@@ -98,7 +101,7 @@ NS_ASSUME_NONNULL_BEGIN
 }
 
 - (void)addChange:(FSTDocumentViewChange *)change {
-  FSTDocumentKey *key = change.document.key;
+  const DocumentKey &key = change.document.key;
   FSTDocumentViewChange *oldChange = [self.changeMap objectForKey:key];
   if (!oldChange) {
     self.changeMap = [self.changeMap dictionaryBySettingObject:change forKey:key];