documentation update

[ginac.git] / ginac / relational.h

diff --git a/ginac/relational.h b/ginac/relational.h
index c3b223b5eb0f494f722ffc25f20a10ce72de5431..779b1fe871e46ef1b8985fa2c4a934627a5fa1f1 100644 (file)
--- a/ginac/relational.h
+++ b/ginac/relational.h
@@ -3,7 +3,7 @@
  *  Interface to relations between expressions. */
 
 /*
- *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2002 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
@@ -49,7 +49,7 @@ public:
 public:
        relational(const ex & lhs, const ex & rhs, operators oper=equal);
        
-       // functions overriding virtual functions from bases classes
+       // functions overriding virtual functions from base classes
 public:
        void print(const print_context & c, unsigned level = 0) const;
        unsigned precedence(void) const {return 20;}
@@ -57,12 +57,14 @@ public:
        unsigned nops() const;
        ex & let_op(int i);
        ex eval(int level=0) const;
-       ex evalf(int level=0) const;
-       ex normal(lst &sym_lst, lst &repl_lst, int level=0) const;
+       ex subs(const lst & ls, const lst & lr, bool no_pattern = false) const;
        ex simplify_ncmul(const exvector & v) const;
+
 protected:
+       bool match_same_type(const basic & other) const;
        unsigned return_type(void) const;
        unsigned return_type_tinfo(void) const;
+       unsigned calchash(void) const;
 
        // new virtual functions which can be overridden by derived classes
 public:
@@ -82,9 +84,11 @@ protected:
 };
 
 // utility functions
-inline const relational &ex_to_relational(const ex &e)
+
+/** Specialization of is_exactly_a<relational>(obj) for relational objects. */
+template<> inline bool is_exactly_a<relational>(const basic & obj)
 {
-       return static_cast<const relational &>(*e.bp);
+       return obj.tinfo()==TINFO_relational;
 }
 
 } // namespace GiNaC