From aa3247ba48f78f4423874f2a64f00b12bf0b27d6 Mon Sep 17 00:00:00 2001
From: Mathias Stearn <mathias@10gen.com>
Date: Wed, 14 Jan 2015 13:43:32 -0500
Subject: Move BSON hashing functionality into BSONObj and BSONElement

---
 src/mongo/bson/bsonelement.h | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src/mongo/bson/bsonelement.h')

diff --git a/src/mongo/bson/bsonelement.h b/src/mongo/bson/bsonelement.h
index 67b345545ba..a5937349399 100644
--- a/src/mongo/bson/bsonelement.h
+++ b/src/mongo/bson/bsonelement.h
@@ -400,6 +400,15 @@ namespace mongo {
         */
         int woCompare( const BSONElement &e, bool considerFieldName = true ) const;
 
+        /**
+         * Functor compatible with std::hash for std::unordered_{map,set}
+         * Warning: The hash function is subject to change. Do not use in cases where hashes need
+         *          to be consistent across versions.
+         */
+        struct Hasher {
+            size_t operator() (const BSONElement& elem) const;
+        };
+
         const char * rawdata() const { return data; }
 
         /** 0 == Equality, just not defined yet */
-- 
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