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[ginac.git] / ginac / symbol.h

diff --git a/ginac/symbol.h b/ginac/symbol.h
index a8e667f4c0277e5ab23e58753dd4217730404a1f..51164a972de73971d7f51b99d08f5a6800bbb626 100644 (file)
--- a/ginac/symbol.h
+++ b/ginac/symbol.h
@@ -40,6 +40,8 @@ class symbol : public basic
 {
        GINAC_DECLARE_REGISTERED_CLASS(symbol, basic)
 
+       friend class realsymbol;
+
 // types
        
        /** Symbols as keys to expressions - only for ginsh. */
@@ -54,10 +56,10 @@ class symbol : public basic
        
        // other constructors
 public:
-       explicit symbol(const std::string & initname, unsigned domain = symbol_options::complex);
-       symbol(const std::string & initname, const std::string & texname, unsigned domain = symbol_options::complex);
-       symbol(const std::string & initname, unsigned rt, unsigned rtt, unsigned domain = symbol_options::complex);
-       symbol(const std::string & initname, const std::string & texname, unsigned rt, unsigned rtt, unsigned domain = symbol_options::complex);
+       explicit symbol(const std::string & initname, unsigned domain = domain::complex);
+       symbol(const std::string & initname, const std::string & texname, unsigned domain = domain::complex);
+       symbol(const std::string & initname, unsigned rt, unsigned rtt, unsigned domain = domain::complex);
+       symbol(const std::string & initname, const std::string & texname, unsigned rt, unsigned rtt, unsigned domain = domain::complex);
        
        // functions overriding virtual functions from base classes
 public:
@@ -108,12 +110,31 @@ private:
 };
 
 
+/** Specialization of symbol to real domain */
+class realsymbol : public symbol
+{
+       // constructors
+public:
+       realsymbol();
+       explicit realsymbol(const std::string & initname, unsigned domain = domain::real);
+       realsymbol(const std::string & initname, const std::string & texname, unsigned domain = domain::real);
+       realsymbol(const std::string & initname, unsigned rt, unsigned rtt, unsigned domain = domain::real);
+       realsymbol(const std::string & initname, const std::string & texname, unsigned rt, unsigned rtt, unsigned domain = domain::real);
+};
+
+
 // utility functions
 
 /** Specialization of is_exactly_a<symbol>(obj) for symbol objects. */
 template<> inline bool is_exactly_a<symbol>(const basic & obj)
 {
-       return obj.tinfo()==TINFO_symbol;
+       return obj.tinfo() == TINFO_symbol;
+}
+
+/** Specialization of is_exactly_a<realsymbol>(obj) for realsymbol objects. */
+template<> inline bool is_exactly_a<realsymbol>(const basic & obj)
+{
+       return (obj.tinfo() == TINFO_symbol) && (static_cast<const symbol &>(obj).get_domain() == domain::real);
 }
 
 // wrapper functions around member functions