1 files changed, 10 insertions, 4 deletions
diff --git a/Firestore/core/src/firebase/firestore/model/document_key.h b/Firestore/core/src/firebase/firestore/model/document_key.h
index 6532b2e..f6f4bf1 100644
--- a/Firestore/core/src/firebase/firestore/model/document_key.h
+++ b/Firestore/core/src/firebase/firestore/model/document_key.h
@@ -59,15 +59,15 @@ class DocumentKey {
     return [FSTDocumentKey keyWithPath:path()];
   }
 
-  std::string ToString() const {
-    return path().CanonicalString();
-  }
-
   NSUInteger Hash() const {
     return util::Hash(ToString());
   }
 #endif
 
+  std::string ToString() const {
+    return path().CanonicalString();
+  }
+
   /**
    * Creates and returns a new document key using '/' to split the string into
    * segments.
@@ -119,6 +119,12 @@ inline bool operator>=(const DocumentKey& lhs, const DocumentKey& rhs) {
   return lhs.path() >= rhs.path();
 }
 
+struct DocumentKeyHash {
+  size_t operator()(const DocumentKey& key) const {
+    return util::Hash(key.ToString());
+  }
+};
+
 }  // namespace model
 
 namespace util {