replace SCM_ASSERT_TYPE with LY_ASSERT_TYPE and friends

[lilypond.git] / lily / performance.cc

diff --git a/lily/performance.cc b/lily/performance.cc
index e536622f06f550336876ea29f4e3b421df787bce..70d5348a9b1d6f0513e7cc8b983538ec79b77cfe 100644 (file)
--- a/lily/performance.cc
+++ b/lily/performance.cc
@@ -109,3 +109,9 @@ void
 Performance::process ()
 {
 }
+
+Performance *
+unsmob_performance (SCM x)
+{
+  return dynamic_cast<Performance*> (unsmob_music_output (x));
+}