X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fclifford.h;h=2d1680c2604ea507c7a2bcd7d871337c7f1caf56;hp=42be538f5f5bdbe9beb29dd95d67af6ab951b792;hb=9f015041142625abf6645b3ea39c62b59a5f442c;hpb=08af38543754f923653d73fd84625bb8a35b0136

diff --git a/ginac/clifford.h b/ginac/clifford.h
index 42be538f..2d1680c2 100644
--- a/ginac/clifford.h
+++ b/ginac/clifford.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's clifford algebra (Dirac gamma) objects. */
 
 /*
- *  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
@@ -48,7 +48,11 @@ public:
 	clifford(unsigned char rl, exvector * vp); // vp will be deleted
 
 	// functions overriding virtual functions from base classes
+public:
+	void print(const print_context & c, unsigned level = 0) const;
+
 protected:
+	bool match_same_type(const basic & other) const;
 	ex simplify_ncmul(const exvector & v) const;
 	ex thisexprseq(const exvector & v) const;
 	ex thisexprseq(exvector * vp) const;
@@ -70,7 +74,7 @@ class diracone : public tensor
 {
 	GINAC_DECLARE_REGISTERED_CLASS(diracone, tensor)
 
-	// 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;
 };
@@ -81,7 +85,7 @@ class diracgamma : public tensor
 {
 	GINAC_DECLARE_REGISTERED_CLASS(diracgamma, tensor)
 
-	// 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;
 	bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const;
@@ -94,19 +98,20 @@ class diracgamma5 : public tensor
 {
 	GINAC_DECLARE_REGISTERED_CLASS(diracgamma5, tensor)
 
-	// 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;
 };
 
 
 // global functions
-inline const clifford &ex_to_clifford(const ex &e)
+
+/** Specialization of is_exactly_a<clifford>(obj) for clifford objects. */
+template<> inline bool is_exactly_a<clifford>(const basic & obj)
 {
-	return static_cast<const clifford &>(*e.bp);
+	return obj.tinfo()==TINFO_clifford;
 }
 
-
 /** Create a Clifford unity object.
  *
  *  @param rl Representation label
@@ -149,6 +154,10 @@ ex dirac_slash(const ex & e, const ex & dim, unsigned char rl = 0);
  *  @param trONE Expression to be returned as the trace of the unit matrix */
 ex dirac_trace(const ex & e, unsigned char rl = 0, const ex & trONE = 4);
 
+/** Bring all products of clifford objects in an expression into a canonical
+ *  order. This is not necessarily the most simple form but it will allow
+ *  to check two expressions for equality. */
+ex canonicalize_clifford(const ex & e);
 
 } // namespace GiNaC