lily/symbol-cache.cc

   1 /*
   2   symbol-cache.cc --  implement a cache for literal symbols, eg
   3     symbol ("foo-bar")
   4
   5
   6   source file of the GNU LilyPond music typesetter
   7
   8   (c) 2000--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   9
  10  */
  11
  12 #include <map>
  13 #include "lily-guile.hh"
  14
  15 #if 0
  16
  17 typedef map<const char*, SCM> Literal_symbol_map;
  18 Literal_symbol_map literal_map;
  19
  20
  21 SCM
  22 symbol (const char*s)
  23 {
  24   Literal_symbol_map::const_iterator i = literal_map.find (s);
  25   if (i != literal_map.end ())
  26     return (*i).second;
  27
  28   SCM sym = gh_symbol2scm ((char*)s);
  29   scm_permanent_object (sym);
  30   literal_map[s] = sym;
  31   return sym;
  32 }
  33
  34
  35 /*
  36   This is a gory trick to cache the value gh_symbol2scm (), without
  37   cluttering up the C code with snarf macros.
  38
  39   You should *ONLY* use symbol () for arguments that are literal
  40   strings!
  41
  42   without (wtk1-fugue2)
  43
  44         real    0m20.157s
  45         user    0m19.800s
  46         sys     0m0.140s
  47
  48   with: (per file.)
  49
  50         real    0m19.284s
  51         user    0m18.630s
  52         sys     0m0.190s
  53
  54
  55   global with STL map
  56
  57         real    0m20.616s
  58         user    0m19.360s
  59         sys     0m0.080s
  60
  61   global with binsearch.
  62
  63         real    0m19.352s
  64         user    0m18.710s
  65         sys     0m0.230s
  66
  67   local binsearch
  68
  69    user 18.8
  70
  71   local with binsearch, and other optimizations.
  72
  73    17.7
  74 */
  75 #endif
  76
  77