[Octave-cvsupdate] CVS update notice (octave-forge/main/symbolic)

[Willem J. A. <wa...@us...>]

Update of /cvsroot/octave/octave-forge/main/symbolic
In directory sc8-pr-cvs1:/tmp/cvs-serv11738

Modified Files:
	ov-ex.h ov-ex.cc 
Log Message:
main/symbolic/ov-ex.h
main/symbolic/ov-ex.cc
  Modified the constructors and the destructor and added a symbol list
  and symbol reference count. New members are:
       void assign_symbol_to_list(GiNaC::symbol &sym);
       class symbol_list_item;
       static std::vector<symbol_list_item> symbol_list;
  This is a work-around for the fact that GiNaC can have different
  symbols with the same string name, while in octave you want a symbol
  that appears the same to actually be the same. It works great as long as
  symbols are declared in octave. It is still possible to have same-name
  symbols that are different to GiNaC, if a symbol goes out of scope in
  octave without it being defined in octave's workspace. This could be
  fixed by also keeping reference counts for symbols in expressions.