Asking a symbol whether it is positive now works.

[ginac.git] / ginac / symbol.cpp

diff --git a/ginac/symbol.cpp b/ginac/symbol.cpp
index 57227fd1d7da9ba561579946056c0a1f04c96226..545524cb055969ad56c4d75c64e1e7f50f421492 100644 (file)
--- a/ginac/symbol.cpp
+++ b/ginac/symbol.cpp
@@ -3,7 +3,7 @@
  *  Implementation of GiNaC's symbolic objects. */
 
 /*
- *  GiNaC Copyright (C) 1999-2004 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2006 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
@@ -17,7 +17,7 @@
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #include <string>
@@ -42,42 +42,88 @@ GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(symbol, basic,
 // default constructor
 //////////
 
+// symbol
+
 symbol::symbol()
- : inherited(TINFO_symbol), asexinfop(new assigned_ex_info), serial(next_serial++), name(autoname_prefix() + ToString(serial)), TeX_name(name), ret_type(return_types::commutative), ret_type_tinfo(TINFO_symbol), domain(symbol_options::complex)
+ : 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)
 {
        setflag(status_flags::evaluated | status_flags::expanded);
 }
 
+// realsymbol
+
+realsymbol::realsymbol()
+{
+       domain = domain::real;
+}
+
+// possymbol
+
+possymbol::possymbol()
+{
+       domain = domain::positive;
+}
+
 //////////
 // other constructors
 //////////
 
 // public
 
+// symbol
+
 symbol::symbol(const std::string & initname, unsigned domain)
- : inherited(TINFO_symbol), asexinfop(new assigned_ex_info), serial(next_serial++), name(initname), TeX_name(default_TeX_name()), ret_type(return_types::commutative), ret_type_tinfo(TINFO_symbol), domain(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)
 {
        setflag(status_flags::evaluated | status_flags::expanded);
 }
 
-symbol::symbol(const std::string & initname, const std::string & texname, unsigned domain)
- : inherited(TINFO_symbol), asexinfop(new assigned_ex_info), serial(next_serial++), name(initname), TeX_name(texname), ret_type(return_types::commutative), ret_type_tinfo(TINFO_symbol), domain(domain)
+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)
 {
        setflag(status_flags::evaluated | status_flags::expanded);
 }
 
-symbol::symbol(const std::string & initname, unsigned rt, unsigned rtt, unsigned domain)
- : inherited(TINFO_symbol), 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, 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)
 {
        setflag(status_flags::evaluated | status_flags::expanded);
 }
 
-symbol::symbol(const std::string & initname, const std::string & texname, unsigned rt, unsigned rtt, unsigned domain)
- : inherited(TINFO_symbol), 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, 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)
 {
        setflag(status_flags::evaluated | status_flags::expanded);
 }
 
+// realsymbol
+       
+realsymbol::realsymbol(const std::string & initname, unsigned domain)
+ : symbol(initname, 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)
+ : symbol(initname, rt, rtt, domain) { }
+
+realsymbol::realsymbol(const std::string & initname, const std::string & texname, unsigned rt, tinfo_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, tinfo_t rtt, unsigned domain)
+ : symbol(initname, rt, rtt, domain) { }
+
+possymbol::possymbol(const std::string & initname, const std::string & texname, unsigned rt, tinfo_t rtt, unsigned domain)
+ : symbol(initname, texname, rt, rtt, domain) { }
+
 //////////
 // archiving
 //////////
@@ -91,11 +137,9 @@ symbol::symbol(const archive_node &n, lst &sym_lst)
        if (!n.find_string("TeXname", TeX_name))
                TeX_name = default_TeX_name();
        if (!n.find_unsigned("domain", domain))
-               domain = symbol_options::complex;
+               domain = domain::complex;
        if (!n.find_unsigned("return_type", ret_type))
                ret_type = return_types::commutative;
-       if (!n.find_unsigned("return_type_tinfo", ret_type_tinfo))
-               ret_type_tinfo = TINFO_symbol;
        setflag(status_flags::evaluated | status_flags::expanded);
 }
 
@@ -122,12 +166,10 @@ void symbol::archive(archive_node &n) const
        n.add_string("name", name);
        if (TeX_name != default_TeX_name())
                n.add_string("TeX_name", TeX_name);
-       if (domain != symbol_options::complex)
+       if (domain != domain::complex)
                n.add_unsigned("domain", domain);
        if (ret_type != return_types::commutative)
                n.add_unsigned("return_type", ret_type);
-       if (ret_type_tinfo != TINFO_symbol)
-               n.add_unsigned("return_type_tinfo", ret_type_tinfo);
 }
 
 //////////
@@ -165,14 +207,19 @@ 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)
+       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 || domain==domain::positive;
+       if (inf == info_flags::positive || inf == info_flags::nonnegative)
+               return domain == domain::positive;
        else
                return inherited::info(inf);
 }
@@ -195,13 +242,32 @@ ex symbol::eval(int level) const
 
 ex symbol::conjugate() const
 {
-       if (this->domain == symbol_options::complex) {
-               return GiNaC::conjugate(*this).hold();
+       if (this->domain == domain::complex) {
+               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.
@@ -233,7 +299,7 @@ bool symbol::is_equal_same_type(const basic & other) const
 
 unsigned symbol::calchash() const
 {
-       hashvalue = golden_ratio_hash(tinfo() ^ serial);
+       hashvalue = golden_ratio_hash((p_int)tinfo() ^ serial);
        setflag(status_flags::hash_calculated);
        return hashvalue;
 }