lily/context-handle.cc

   1 /*
   2   context-handle.cc -- implement Context_handle
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "context-handle.hh"
  10 #include "context.hh"
  11
  12 Context_handle::Context_handle ()
  13 {
  14   outlet_ = 0;
  15 }
  16
  17 Context_handle::Context_handle (Context_handle const &s)
  18 {
  19   outlet_ = 0;
  20   if (s.outlet_)
  21     up (s.outlet_);
  22 }
  23
  24 Context_handle::~Context_handle ()
  25 {
  26   /*
  27     Don't do
  28
  29     if (outlet_)
  30     down ();
  31
  32     with GC, this is asynchronous.
  33   */
  34 }
  35
  36 void
  37 Context_handle::up (Context *t)
  38 {
  39   outlet_ = t;
  40   t->iterator_count_++;
  41 }
  42
  43 void
  44 Context_handle::down ()
  45 {
  46   outlet_->iterator_count_--;
  47   outlet_ = 0;
  48 }
  49
  50 void
  51 Context_handle::operator = (Context_handle const &s)
  52 {
  53   set_context (s.outlet_);
  54 }
  55
  56 void
  57 Context_handle::set_context (Context *trans)
  58 {
  59   if (outlet_ == trans)
  60     return;
  61   if (outlet_)
  62     down ();
  63   if (trans)
  64     up (trans);
  65 }
  66
  67 Context *
  68 Context_handle::get_outlet () const
  69 {
  70
  71   return outlet_;
  72 }
  73
  74 int
  75 Context_handle::get_count () const
  76 {
  77   return outlet_->iterator_count_;
  78 }