From ba497c80b7f446cc0217dd15c30750e57a35d635 Mon Sep 17 00:00:00 2001
From: fred <fred>
Date: Sun, 24 Mar 2002 19:28:45 +0000
Subject: [PATCH] lilypond-0.0.26

---
 hdr/item.hh      |  6 +++---
 hdr/spanner.hh   | 11 ++++++-----
 hdr/staffelem.hh |  9 ++++++++-
 3 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/hdr/item.hh b/hdr/item.hh
index 9b234819ec..68f1402c5b 100644
--- a/hdr/item.hh
+++ b/hdr/item.hh
@@ -6,16 +6,16 @@
 #include "string.hh"
 #include "staffelem.hh"
 
-
 /// a horizontally fixed size element of the score
 struct Item : Staff_elem {
     /// indirection to the column it is in
     PCol * pcol_l_;
 
     /****************/
-    
+    virtual Item *item() { return this; }
     Item();
-    void print()const;
+    void do_print()const;
+    const char*name()const;
 };
 /** Item is the datastructure for printables whose width is known
   before the spacing is calculated
diff --git a/hdr/spanner.hh b/hdr/spanner.hh
index d04f0736a6..144b110e29 100644
--- a/hdr/spanner.hh
+++ b/hdr/spanner.hh
@@ -19,9 +19,10 @@ struct Spanner:Staff_elem {
     
     Spanner();
     virtual Interval width()const;
-    void print()const;
-
+    void do_print()const;
+    const char* name()const;
     Spanner *broken_at(PCol *c1,  PCol *c2) const;
+    virtual Spanner* spanner() { return this; }
 protected:
     /// clone a piece of  this spanner.
     virtual Spanner *do_break_at( PCol *c1,  PCol *c2) const=0; 
@@ -31,9 +32,9 @@ protected:
     c1 >= start, c2  <= stop
     */
 };
-/**
-  A spanner is a symbol whose final appearance can only be calculated
-  after the breaking problem is solved.
+/** A spanner is a symbol which spans across several columns, so its
+  final appearance can only be calculated after the breaking problem
+  is solved.
 
   Examples
 
diff --git a/hdr/staffelem.hh b/hdr/staffelem.hh
index 3eed7dfba7..c7751b6ecc 100644
--- a/hdr/staffelem.hh
+++ b/hdr/staffelem.hh
@@ -40,8 +40,13 @@ struct Staff_elem {
     void pre_processing();
     void post_processing();
     void molecule_processing();
-    
+    virtual const char *name() const;		// to find out derived classes.
+    virtual Spanner* spanner()  { return 0; }
+    virtual Item * item() { return 0; }
 protected:
+    
+    /// do printing of derived info.
+    virtual void do_print() const=0;
     /// generate the molecule    
     virtual Molecule* brew_molecule_p()const=0;
     ///executed directly after the item is added to the PScore
@@ -69,5 +74,7 @@ private:
   accomplished with the dependencies field of struct Staff_elem.
 
   */
+
+#define NAME_METHOD(c)	const char *c::name()const{ return #c; } struct c
 #endif // STAFFELEM_HH
 
-- 
2.39.5