+LY_DEFINE (ly_sub_moment, "ly:moment-sub",
+ 2, 0, 0, (SCM a, SCM b),
+ "Subtract two moments.")
+{
+ Moment *ma = unsmob_moment (a);
+ Moment *mb = unsmob_moment (b);
+ SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
+ SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
+ return (*ma - *mb).smobbed_copy ();
+}
+
+LY_DEFINE (ly_moment_add, "ly:moment-add",