const operators for geohashes

1 files changed, 7 insertions, 2 deletions

diff --git a/db/geo/core.h b/db/geo/core.h
index 74f4b6e8269..b77997844f2 100644
--- a/db/geo/core.h
+++ b/db/geo/core.h
@@ -278,14 +278,19 @@ namespace mongo {
             return *this;
         }
 
-        bool operator==(const GeoHash& h ) {
+        bool operator==(const GeoHash& h ) const {
             return _hash == h._hash && _bits == h._bits;
         }
 
-        bool operator!=(const GeoHash& h ) {
+        bool operator!=(const GeoHash& h ) const {
             return !( *this == h );
         }
 
+        bool operator<(const GeoHash& h ) const {
+            if( _hash != h._hash ) return _hash < h._hash;
+            return _bits < h._bits;
+        }
+
         GeoHash& operator+=( const char * s ) {
             unsigned pos = _bits * 2;
             _bits += strlen(s) / 2;