CXX-560 Mark mongo::OID::asTimeT() and mongo::OID::asDateT() const

Author: mapx

src/mongo/bson/oid.cpp

@@ -145,7 +145,7 @@ namespace {
                     kInstanceUniqueSize + kIncrementSize);
     }
 
-    time_t OID::asTimeT() {
+    time_t OID::asTimeT() const {
         return getTimestamp();
     }
 

src/mongo/bson/oid.h

@@ -128,8 +128,8 @@ namespace mongo {
         /** Set to the min/max OID that could be generated at given timestamp. */
         void init( Date_t date, bool max=false );
 
-        time_t asTimeT();
-        Date_t asDateT() { return asTimeT() * 1000LL; }
+        time_t asTimeT() const;
+        Date_t asDateT() const { return asTimeT() * 1000LL; }
 
         // True iff the OID is not empty
         bool isSet() const {