Add operator-= to Time.

diff --git a/src/dcp_time.h b/src/dcp_time.h
index 997b8d13f019c78c0242b0bb42c6a6168c49044c..dcbadf31294137036654a9c06478a3494bb3da09 100644 (file)
--- a/src/dcp_time.h
+++ b/src/dcp_time.h
@@ -142,6 +142,11 @@ public:
                return *this;
        }
 
+       Time& operator-= (Time const & o) {
+               *this = *this - o;
+               return *this;
+       }
+
 private:
        void set (double seconds, int tcr);
 };