* Implementation of GiNaC's symbolic objects. */
/*
- * GiNaC Copyright (C) 1999-2002 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
GINAC_IMPLEMENT_REGISTERED_CLASS(symbol, basic)
//////////
-// default ctor, dtor, copy ctor, assignment operator and helpers
+// default constructor
//////////
-symbol::symbol() : inherited(TINFO_symbol), serial(next_serial++)
+symbol::symbol()
+ : inherited(TINFO_symbol), asexinfop(new assigned_ex_info), serial(next_serial++), name(autoname_prefix() + ToString(serial)), TeX_name(name)
{
- name = TeX_name = autoname_prefix()+ToString(serial);
- asexinfop = new assigned_ex_info;
setflag(status_flags::evaluated | status_flags::expanded);
}
-/** For use by copy ctor and assignment operator. */
-void symbol::copy(const symbol & other)
-{
- inherited::copy(other);
- name = other.name;
- TeX_name = other.TeX_name;
- serial = other.serial;
- asexinfop = other.asexinfop;
- ++(asexinfop->refcount);
-}
-
-void symbol::destroy(bool call_parent)
-{
- if (--asexinfop->refcount == 0)
- delete asexinfop;
- if (call_parent)
- inherited::destroy(call_parent);
-}
-
//////////
-// other ctors
+// other constructors
//////////
// public
-symbol::symbol(const std::string & initname) : inherited(TINFO_symbol)
+symbol::symbol(const std::string & initname)
+ : inherited(TINFO_symbol), asexinfop(new assigned_ex_info), serial(next_serial++), name(initname), TeX_name(default_TeX_name())
{
- name = initname;
- TeX_name = default_TeX_name();
- serial = next_serial++;
- asexinfop = new assigned_ex_info;
setflag(status_flags::evaluated | status_flags::expanded);
}
-symbol::symbol(const std::string & initname, const std::string & texname) : inherited(TINFO_symbol)
+symbol::symbol(const std::string & initname, const std::string & texname)
+ : inherited(TINFO_symbol), asexinfop(new assigned_ex_info), serial(next_serial++), name(initname), TeX_name(texname)
{
- name = initname;
- TeX_name = texname;
- serial = next_serial++;
- asexinfop = new assigned_ex_info;
setflag(status_flags::evaluated | status_flags::expanded);
}
//////////
/** Construct object from archive_node. */
-symbol::symbol(const archive_node &n, const lst &sym_lst) : inherited(n, sym_lst)
+symbol::symbol(const archive_node &n, lst &sym_lst)
+ : inherited(n, sym_lst), asexinfop(new assigned_ex_info), serial(next_serial++)
{
- serial = next_serial++;
if (!(n.find_string("name", name)))
name = autoname_prefix() + ToString(serial);
if (!(n.find_string("TeXname", TeX_name)))
TeX_name = default_TeX_name();
- asexinfop = new assigned_ex_info;
setflag(status_flags::evaluated);
}
/** Unarchive the object. */
-ex symbol::unarchive(const archive_node &n, const lst &sym_lst)
+ex symbol::unarchive(const archive_node &n, lst &sym_lst)
{
ex s = (new symbol(n, sym_lst))->setflag(status_flags::dynallocated);
-
+
// If symbol is in sym_lst, return the existing symbol
- for (unsigned i=0; i<sym_lst.nops(); i++) {
- if (is_ex_of_type(sym_lst.op(i), symbol) && (ex_to<symbol>(sym_lst.op(i)).name == ex_to<symbol>(s).name))
- return sym_lst.op(i);
+ for (lst::const_iterator it = sym_lst.begin(); it != sym_lst.end(); ++it) {
+ if (is_a<symbol>(*it) && (ex_to<symbol>(*it).name == ex_to<symbol>(s).name))
+ return *it;
}
+
+ // Otherwise add new symbol to list and return it
+ sym_lst.append(s);
return s;
}
return serial==o->serial;
}
-unsigned symbol::calchash(void) const
+unsigned symbol::calchash() const
{
- // this is where the schoolbook method
- // (golden_ratio_hash(tinfo()) ^ serial)
- // is not good enough yet...
- hashvalue = golden_ratio_hash(golden_ratio_hash(tinfo()) ^ serial);
+ hashvalue = golden_ratio_hash(tinfo() ^ serial);
setflag(status_flags::hash_calculated);
return hashvalue;
}
void symbol::assign(const ex & value)
{
- asexinfop->is_assigned = 1;
+ asexinfop->is_assigned = true;
asexinfop->assigned_expression = value;
clearflag(status_flags::evaluated | status_flags::expanded);
}
-void symbol::unassign(void)
+void symbol::unassign()
{
if (asexinfop->is_assigned) {
- asexinfop->is_assigned = 0;
+ asexinfop->is_assigned = false;
asexinfop->assigned_expression = _ex0;
}
setflag(status_flags::evaluated | status_flags::expanded);
/** Symbols not constructed with a string get one assigned using this
* prefix and a number. */
-std::string & symbol::autoname_prefix(void)
+std::string & symbol::autoname_prefix()
{
static std::string *s = new std::string("symbol");
return *s;
}
/** Return default TeX name for symbol. This recognizes some greek letters. */
-std::string symbol::default_TeX_name(void) const
+std::string symbol::default_TeX_name() const
{
if (name=="alpha" || name=="beta" || name=="gamma"
|| name=="delta" || name=="epsilon" || name=="varepsilon"
//////////
/** Default ctor. Defaults to unassigned. */
-symbol::assigned_ex_info::assigned_ex_info(void) : is_assigned(0), refcount(1)
+symbol::assigned_ex_info::assigned_ex_info() : is_assigned(false)
{
}