A better return_type_tinfo() mechanism.

[ginac.git] / ginac / symbol.cpp

diff --git a/ginac/symbol.cpp b/ginac/symbol.cpp
index 6b37ee123e30d45082eb90b618e2253944141230..0bdebc0e88a514416b6032b822b4f6392dd89eed 100644 (file)
--- a/ginac/symbol.cpp
+++ b/ginac/symbol.cpp
@@ -3,7 +3,7 @@
  *  Implementation of GiNaC's symbolic objects. */
 
 /*
- *  GiNaC Copyright (C) 1999-2006 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2008 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
@@ -45,7 +45,7 @@ GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(symbol, basic,
 // symbol
 
 symbol::symbol()
- : inherited(&symbol::tinfo_static), asexinfop(new assigned_ex_info), serial(next_serial++), name(autoname_prefix() + ToString(serial)), TeX_name(name), ret_type(return_types::commutative), ret_type_tinfo(&symbol::tinfo_static), domain(domain::complex)
+ : inherited(&symbol::tinfo_static), serial(next_serial++), name(autoname_prefix() + ToString(serial)), TeX_name(name), domain(domain::complex), ret_type(return_types::commutative), ret_type_tinfo(make_return_type_t<symbol>())
 {
        setflag(status_flags::evaluated | status_flags::expanded);
 }
@@ -57,6 +57,13 @@ realsymbol::realsymbol()
        domain = domain::real;
 }
 
+// possymbol
+
+possymbol::possymbol()
+{
+       domain = domain::positive;
+}
+
 //////////
 // other constructors
 //////////
@@ -66,25 +73,25 @@ realsymbol::realsymbol()
 // symbol
 
 symbol::symbol(const std::string & initname, unsigned domain)
- : inherited(&symbol::tinfo_static), asexinfop(new assigned_ex_info), serial(next_serial++), name(initname), TeX_name(default_TeX_name()), ret_type(return_types::commutative), ret_type_tinfo(&symbol::tinfo_static), domain(domain)
+ : inherited(&symbol::tinfo_static), serial(next_serial++), name(initname), TeX_name(default_TeX_name()), domain(domain), ret_type(return_types::commutative), ret_type_tinfo(make_return_type_t<symbol>())
 {
        setflag(status_flags::evaluated | status_flags::expanded);
 }
 
-symbol::symbol(const std::string & initname, unsigned rt, tinfo_t rtt, unsigned domain)
- : inherited(&symbol::tinfo_static), asexinfop(new assigned_ex_info), serial(next_serial++), name(initname), TeX_name(default_TeX_name()), ret_type(rt), ret_type_tinfo(rtt), domain(domain)
+symbol::symbol(const std::string & initname, unsigned rt, const return_type_t& rtt, unsigned domain)
+ : inherited(&symbol::tinfo_static), serial(next_serial++), name(initname), TeX_name(default_TeX_name()), domain(domain), ret_type(rt), ret_type_tinfo(rtt)
 {
        setflag(status_flags::evaluated | status_flags::expanded);
 }
 
 symbol::symbol(const std::string & initname, const std::string & texname, unsigned domain)
- : inherited(&symbol::tinfo_static), asexinfop(new assigned_ex_info), serial(next_serial++), name(initname), TeX_name(texname), ret_type(return_types::commutative), ret_type_tinfo(&symbol::tinfo_static), domain(domain)
+ : inherited(&symbol::tinfo_static), serial(next_serial++), name(initname), TeX_name(texname), domain(domain), ret_type(return_types::commutative), ret_type_tinfo(make_return_type_t<symbol>())
 {
        setflag(status_flags::evaluated | status_flags::expanded);
 }
 
-symbol::symbol(const std::string & initname, const std::string & texname, unsigned rt, tinfo_t rtt, unsigned domain)
- : inherited(&symbol::tinfo_static), asexinfop(new assigned_ex_info), serial(next_serial++), name(initname), TeX_name(texname), ret_type(rt), ret_type_tinfo(rtt), domain(domain)
+symbol::symbol(const std::string & initname, const std::string & texname, unsigned rt, const return_type_t& rtt, unsigned domain)
+ : inherited(&symbol::tinfo_static),  serial(next_serial++), name(initname), TeX_name(texname), domain(domain), ret_type(rt), ret_type_tinfo(rtt)
 {
        setflag(status_flags::evaluated | status_flags::expanded);
 }
@@ -97,10 +104,24 @@ realsymbol::realsymbol(const std::string & initname, unsigned domain)
 realsymbol::realsymbol(const std::string & initname, const std::string & texname, unsigned domain)
  : symbol(initname, texname, domain) { }
 
-realsymbol::realsymbol(const std::string & initname, unsigned rt, tinfo_t rtt, unsigned domain)
+realsymbol::realsymbol(const std::string & initname, unsigned rt, const return_type_t& rtt, unsigned domain)
  : symbol(initname, rt, rtt, domain) { }
 
-realsymbol::realsymbol(const std::string & initname, const std::string & texname, unsigned rt, tinfo_t rtt, unsigned domain)
+realsymbol::realsymbol(const std::string & initname, const std::string & texname, unsigned rt, const return_type_t& rtt, unsigned domain)
+ : symbol(initname, texname, rt, rtt, domain) { }
+
+// possymbol
+       
+possymbol::possymbol(const std::string & initname, unsigned domain)
+ : symbol(initname, domain) { }
+
+possymbol::possymbol(const std::string & initname, const std::string & texname, unsigned domain)
+ : symbol(initname, texname, domain) { }
+
+possymbol::possymbol(const std::string & initname, unsigned rt, const return_type_t& rtt, unsigned domain)
+ : symbol(initname, rt, rtt, domain) { }
+
+possymbol::possymbol(const std::string & initname, const std::string & texname, unsigned rt, const return_type_t& rtt, unsigned domain)
  : symbol(initname, texname, rt, rtt, domain) { }
 
 //////////
@@ -109,7 +130,7 @@ realsymbol::realsymbol(const std::string & initname, const std::string & texname
 
 /** Construct object from archive_node. */
 symbol::symbol(const archive_node &n, lst &sym_lst)
- : inherited(n, sym_lst), asexinfop(new assigned_ex_info), serial(next_serial++)
+ : inherited(n, sym_lst), serial(next_serial++)
 {
        if (!n.find_string("name", name))
                name = autoname_prefix() + ToString(serial);
@@ -186,46 +207,55 @@ void symbol::do_print_python_repr(const print_python_repr & c, unsigned level) c
 
 bool symbol::info(unsigned inf) const
 {
-       if (inf == info_flags::symbol)
-               return true;
-       if (inf == info_flags::polynomial ||
-           inf == info_flags::integer_polynomial ||
-           inf == info_flags::cinteger_polynomial ||
-           inf == info_flags::rational_polynomial ||
-           inf == info_flags::crational_polynomial ||
-           inf == info_flags::rational_function)
-               return true;
-       if (inf == info_flags::real)
-               return domain == domain::real;
-       else
-               return inherited::info(inf);
-}
-
-ex symbol::eval(int level) const
-{
-       if (level == -max_recursion_level)
-               throw(std::runtime_error("max recursion level reached"));
-       
-       if (asexinfop->is_assigned) {
-               setflag(status_flags::evaluated);
-               if (level==1)
-                       return (asexinfop->assigned_expression);
-               else
-                       return (asexinfop->assigned_expression).eval(level);
-       } else {
-               return this->hold();
+       switch (inf) {
+               case info_flags::symbol:
+               case info_flags::polynomial:
+               case info_flags::integer_polynomial: 
+               case info_flags::cinteger_polynomial: 
+               case info_flags::rational_polynomial: 
+               case info_flags::crational_polynomial: 
+               case info_flags::rational_function: 
+               case info_flags::expanded:
+                       return true;
+               case info_flags::real:
+                       return domain == domain::real || domain == domain::positive;
+               case info_flags::positive:
+               case info_flags::nonnegative:
+                       return domain == domain::positive;
+               case info_flags::has_indices:
+                       return false;
        }
+       return inherited::info(inf);
 }
 
 ex symbol::conjugate() const
 {
        if (this->domain == domain::complex) {
-               return GiNaC::conjugate_function(*this).hold();
+               return conjugate_function(*this).hold();
        } else {
                return *this;
        }
 }
 
+ex symbol::real_part() const
+{
+       if (domain==domain::real || domain==domain::positive)
+               return *this;
+       return real_part_function(*this).hold();
+}
+
+ex symbol::imag_part() const
+{
+       if (domain==domain::real || domain==domain::positive)
+               return 0;
+       return imag_part_function(*this).hold();
+}
+
+bool symbol::is_polynomial(const ex & var) const
+{
+       return true;
+}
+
 // protected
 
 /** Implementation of ex::diff() for single differentiation of a symbol.
@@ -257,7 +287,8 @@ bool symbol::is_equal_same_type(const basic & other) const
 
 unsigned symbol::calchash() const
 {
-       hashvalue = golden_ratio_hash((p_int)tinfo() ^ serial);
+       const void* this_tinfo = (const void*)typeid(*this).name();
+       hashvalue = golden_ratio_hash((p_int)this_tinfo ^ serial);
        setflag(status_flags::hash_calculated);
        return hashvalue;
 }
@@ -272,32 +303,14 @@ unsigned symbol::calchash() const
 // non-virtual functions in this class
 //////////
 
-// public
-
-void symbol::assign(const ex & value)
-{
-       asexinfop->is_assigned = true;
-       asexinfop->assigned_expression = value;
-       clearflag(status_flags::evaluated | status_flags::expanded);
-}
-
-void symbol::unassign()
-{
-       if (asexinfop->is_assigned) {
-               asexinfop->is_assigned = false;
-               asexinfop->assigned_expression = _ex0;
-       }
-       setflag(status_flags::evaluated | status_flags::expanded);
-}
-
 // private
 
 /** Symbols not constructed with a string get one assigned using this
  *  prefix and a number. */
-std::string & symbol::autoname_prefix()
+std::string& symbol::autoname_prefix()
 {
-       static std::string *s = new std::string("symbol");
-       return *s;
+       static std::string s("symbol");
+       return s;
 }
 
 /** Return default TeX name for symbol. This recognizes some greek letters. */
@@ -330,13 +343,4 @@ std::string symbol::default_TeX_name() const
 
 unsigned symbol::next_serial = 0;
 
-//////////
-// subclass assigned_ex_info
-//////////
-
-/** Default ctor.  Defaults to unassigned. */
-symbol::assigned_ex_info::assigned_ex_info() throw() : is_assigned(false)
-{
-}
-
 } // namespace GiNaC