Merge branch 'translation' into staging

[lilypond.git] / lily / unpure-pure-container.cc

diff --git a/lily/unpure-pure-container.cc b/lily/unpure-pure-container.cc
index 9b2f871769356ea1de2f47900d8a5a6fb5ffb037..b8d1e2d4a5a84d5458c30af1b1a4fcd64754946d 100644 (file)
--- a/lily/unpure-pure-container.cc
+++ b/lily/unpure-pure-container.cc
@@ -32,6 +32,17 @@ is_unpure_pure_container (SCM s)
   return (SCM_NIMP (s) && SCM_CELL_TYPE (s) == unpure_pure_container_tag);
 }
 
+bool
+is_unchanging_unpure_pure_container (SCM s)
+// A container that has the same callback for both 'pure' and 'unpure' lookups
+// and which ignores the 'start' and 'end' columnns.
+// Such a callback will give the same answer for tentative or final layouts.
+{
+  LY_ASSERT_TYPE (is_unpure_pure_container, s, 1);
+  SCM pure_part = SCM_SMOB_OBJECT_2 (s);
+  return (SCM_UNBNDP (pure_part));
+}
+
 SCM
 unpure_pure_container_unpure_part (SCM smob)
 {