X-Git-Url: https://ginac.de/ginac.git//ginac.git?a=blobdiff_plain;f=ginac%2Fclifford.h;h=50893c8153eed49fb56e9ea34d18f49abec73e76;hb=85ce9664ddba79c28a6945b1e5b4e2b71f77cb51;hp=1bfd561ad96cf944c92f83cec9240bd630222604;hpb=66c0f31c678e6c1938d637636b230ea376c157c1;p=ginac.git

diff --git a/ginac/clifford.h b/ginac/clifford.h
index 1bfd561a..50893c81 100644
--- a/ginac/clifford.h
+++ b/ginac/clifford.h
@@ -1,8 +1,9 @@
 /** @file clifford.h
  *
- *  Interface to GiNaC's clifford objects.
- *
- *  GiNaC Copyright (C) 1999 Johannes Gutenberg University Mainz, Germany
+ *  Interface to GiNaC's clifford algebra (Dirac gamma) objects. */
+
+/*
+ *  GiNaC Copyright (C) 1999-2001 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
@@ -22,68 +23,80 @@
 #ifndef __GINAC_CLIFFORD_H__
 #define __GINAC_CLIFFORD_H__
 
-#include <string>
-#include <ginac/indexed.h>
+#include "indexed.h"
+#include "tensor.h"
+
+namespace GiNaC {
 
-/** Base class for clifford object */
+
+/** This class holds an object representing an element of the Clifford
+ *  algebra (the Dirac gamma matrices). These objects only carry Lorentz
+ *  indices. Spinor indices are hidden. */
 class clifford : public indexed
 {
-// member functions
+	GINAC_DECLARE_REGISTERED_CLASS(clifford, indexed)
 
-    // default constructor, destructor, copy constructor assignment operator and helpers
+	// other constructors
 public:
-    clifford();
-    ~clifford();
-    clifford(clifford const & other);
-    clifford const & operator=(clifford const & other);
-protected:
-    void copy(clifford const & other); 
-    void destroy(bool call_parent);
+	clifford(const ex & b);
+	clifford(const ex & b, const ex & mu);
 
-    // other constructors
-public:
-    explicit clifford(string const & initname);
+	// internal constructors
+	clifford(const exvector & v, bool discardable = false);
+	clifford(exvector * vp); // vp will be deleted
 
-    // functions overriding virtual functions from base classes
-public:
-    basic * duplicate() const;
-    void printraw(ostream & os) const;
-    void printtree(ostream & os, unsigned indent) const;
-    void print(ostream & os, unsigned upper_precedence=0) const;
-    void printcsrc(ostream & os, unsigned type, unsigned upper_precedence=0) const;
-    bool info(unsigned inf) const;
+	// functions overriding virtual functions from base classes
 protected:
-    int compare_same_type(basic const & other) const;
-    ex simplify_ncmul(exvector const & v) const;
-    unsigned calchash(void) const;
-
-    // new virtual functions which can be overridden by derived classes
-    // none
-    
-    // non-virtual functions in this class
+	ex simplify_ncmul(const exvector & v) const;
+	ex thisexprseq(const exvector & v) const;
+	ex thisexprseq(exvector * vp) const;
+	unsigned return_type(void) const { return return_types::noncommutative; }
+	unsigned return_type_tinfo(void) const { return TINFO_clifford; }
+};
+
+
+/** This class represents the Clifford algebra unity element. */
+class diracone : public tensor
+{
+	GINAC_DECLARE_REGISTERED_CLASS(diracone, tensor)
+
+	// functions overriding virtual functions from bases classes
 public:
-    void setname(string const & n);
-private:
-    string & autoname_prefix(void);
+	void print(const print_context & c, unsigned level = 0) const;
+};
 
-// member variables
 
-protected:
-    string name;
-    unsigned serial; // unique serial number for comparision
-private:
-    static unsigned next_serial;
+/** This class represents the Dirac gamma Lorentz vector. */
+class diracgamma : public tensor
+{
+	GINAC_DECLARE_REGISTERED_CLASS(diracgamma, tensor)
+
+	// functions overriding virtual functions from bases classes
+public:
+	void print(const print_context & c, unsigned level = 0) const;
+	bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const;
 };
 
-// global constants
 
-extern const clifford some_clifford;
-extern type_info const & typeid_clifford;
+// global functions
+inline const clifford &ex_to_clifford(const ex &e)
+{
+	return static_cast<const clifford &>(*e.bp);
+}
 
-// macros
 
-#define ex_to_clifford(X) static_cast<clifford const &>(*(X).bp)
+/** Create a Clifford unity object.
+ *
+ *  @return newly constructed object */
+ex dirac_one(void);
 
-#endif // ndef __GINAC_CLIFFORD_H__
+/** Create a Dirac gamma object.
+ *
+ *  @param mu Index (must be of class varidx or a derived class)
+ *  @return newly constructed gamma object */
+ex dirac_gamma(const ex & mu);
 
 
+} // namespace GiNaC
+
+#endif // ndef __GINAC_CLIFFORD_H__