Issue 4086/6: Reimplement unpure-pure-containers in terms of Simple_smob and Smob1

[lilypond.git] / lily / include / unpure-pure-container.hh

diff --git a/lily/include/unpure-pure-container.hh b/lily/include/unpure-pure-container.hh
index 1fd32d40bb68128d9a3a6c8ac650ff0accb7de1c..5db80adec116d936d736f9e2236719cb6e7ed3a8 100644 (file)
--- a/lily/include/unpure-pure-container.hh
+++ b/lily/include/unpure-pure-container.hh
@@ -21,11 +21,25 @@
 #define UNPURE_PURE_CONTAINER_HH
 
 #include "lily-guile.hh"
-
-bool is_unpure_pure_container (SCM s);
-bool is_unchanging_unpure_pure_container (SCM s);
-SCM unpure_pure_container_unpure_part (SCM smob);
-SCM unpure_pure_container_pure_part (SCM smob);
-SCM ly_make_unpure_pure_container (SCM, SCM);
+#include "small-smobs.hh"
+
+class Unpure_pure_container : public Smob2<Unpure_pure_container>
+{
+public:
+  static const char type_p_name_ [];
+  SCM unpure_part () const { return scm1 (); }
+  // 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.
+  bool is_unchanging () const { return SCM_UNBNDP (scm2 ()); }
+  SCM pure_part () const;
+  static SCM make_smob (SCM a, SCM b = SCM_UNDEFINED)
+  {
+    if (SCM_UNBNDP (b) && !ly_is_procedure (a))
+      return Smob2::make_smob (a, a);
+    return Smob2::make_smob (a, b);
+  }
+  static int print_smob (SCM, SCM, scm_print_state *);
+};
 
 #endif /* UNPURE_PURE_CONTAINER_HH */