X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fclifford.h;h=2a9e73b1a6c6c89d772a88d5e7d86d736d7a14ae;hp=0c8573ae232ec47b64a6a49ff49659529c3f87ea;hb=0f617ea4ea1dc6a33cae5e2ce518b26d8055c177;hpb=aa6281216091efd92dc5fcc3f96c7189114e80f1

diff --git a/ginac/clifford.h b/ginac/clifford.h
index 0c8573ae..2a9e73b1 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
@@ -48,9 +48,12 @@ 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;
+	bool match_same_type(const basic & other) const;
 	ex thisexprseq(const exvector & v) const;
 	ex thisexprseq(exvector * vp) const;
 	unsigned return_type(void) const { return return_types::noncommutative; }
@@ -101,14 +104,31 @@ public:
 };
 
 
-// global functions
+/** This class represents the Dirac gammaL object which behaves like
+ *  1/2 (1-gamma5). */
+class diracgammaL : public tensor
+{
+	GINAC_DECLARE_REGISTERED_CLASS(diracgammaL, tensor)
+
+	// functions overriding virtual functions from base classes
+public:
+	void print(const print_context & c, unsigned level = 0) const;
+};
 
-/** Return the clifford object handled by an ex.  Deprecated: use ex_to<clifford>().
- *  This is unsafe: you need to check the type first. */
-inline const clifford &ex_to_clifford(const ex &e)
+
+/** This class represents the Dirac gammaL object which behaves like
+ *  1/2 (1+gamma5). */
+class diracgammaR : public tensor
 {
-	return static_cast<const clifford &>(*e.bp);
-}
+	GINAC_DECLARE_REGISTERED_CLASS(diracgammaR, tensor)
+
+	// functions overriding virtual functions from base classes
+public:
+	void print(const print_context & c, unsigned level = 0) const;
+};
+
+
+// global functions
 
 /** Specialization of is_exactly_a<clifford>(obj) for clifford objects. */
 template<> inline bool is_exactly_a<clifford>(const basic & obj)
@@ -135,10 +155,20 @@ ex dirac_gamma(const ex & mu, unsigned char rl = 0);
  *  @return newly constructed object */
 ex dirac_gamma5(unsigned char rl = 0);
 
-/** This returns (dirac_ONE(rl) + dirac_gamma5(rl)). */
-ex dirac_gamma6(unsigned char rl = 0);
+/** Create a Dirac gammaL object.
+ *
+ *  @param rl Representation label
+ *  @return newly constructed object */
+ex dirac_gammaL(unsigned char rl = 0);
 
-/** This returns (dirac_ONE(rl) - dirac_gamma5(rl)). */
+/** Create a Dirac gammaR object.
+ *
+ *  @param rl Representation label
+ *  @return newly constructed object */
+ex dirac_gammaR(unsigned char rl = 0);
+
+// These functions are deprecated. Use dirac_gammaL/R() instead.
+ex dirac_gamma6(unsigned char rl = 0);
 ex dirac_gamma7(unsigned char rl = 0);
 
 /** Create a term of the form e_mu * gamma~mu with a unique index mu.