degree(), ldegree(), coeff(), lcoeff(), tcoeff() and collect() can now

[ginac.git] / ginac / clifford.h

diff --git a/ginac/clifford.h b/ginac/clifford.h
index 34329b06f65670835f060ef7fbdd484475a704d0..0feef3f049b135c3984af3bfba8f52df5df70923 100644 (file)
--- a/ginac/clifford.h
+++ b/ginac/clifford.h
@@ -1,6 +1,6 @@
 /** @file clifford.h
  *
- *  Interface to GiNaC's clifford objects. */
+ *  Interface to GiNaC's clifford algebra (Dirac gamma) objects. */
 
 /*
  *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
@@ -23,70 +23,60 @@
 #ifndef __GINAC_CLIFFORD_H__
 #define __GINAC_CLIFFORD_H__
 
-#include <string>
-#include "lortensor.h"
+#include "indexed.h"
+#include "tensor.h"
 
-#ifndef NO_NAMESPACE_GINAC
 namespace GiNaC {
-#endif // ndef NO_NAMESPACE_GINAC
 
 
 /** 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 always hidden in our implementation. */
-class clifford : public lortensor
+ *  indices. Spinor indices are hidden. */
+class clifford : public indexed
 {
-       GINAC_DECLARE_REGISTERED_CLASS(clifford, lortensor)
-
-// friends
-
-       friend clifford clifford_gamma(const ex & mu);
-
-// member functions
-
-       // default constructor, destructor, copy constructor assignment operator and helpers
-public:
-       clifford();
-       ~clifford();
-       clifford(const clifford & other);
-       const clifford & operator=(const clifford & other);
-protected:
-       void copy(const clifford & other); 
-       void destroy(bool call_parent);
+       GINAC_DECLARE_REGISTERED_CLASS(clifford, indexed)
 
        // other constructors
 public:
-       clifford(const std::string & n, const ex & mu);
+       clifford(const ex & b);
+       clifford(const ex & b, const ex & mu);
+
+       // 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(std::ostream & os) const;
-       void printtree(std::ostream & os, unsigned indent) const;
-       void print(std::ostream & os, unsigned upper_precedence=0) const;
-       bool info(unsigned inf) const;
-       // ex eval(int level=0) const;
 protected:
-       int compare_same_type(const basic & other) const;
-       bool is_equal_same_type(const basic & other) const;
        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; }
+};
 
-       // new virtual functions which can be overridden by derived classes
-       // none
-       
-       // non-virtual functions in this class
-       // none
 
-       // member variables
-       // none
+/** 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 print(std::ostream & os, unsigned upper_precedence=0) const;
 };
 
-// global constants
 
-extern const clifford some_clifford;
-extern const std::type_info & typeid_clifford;
+/** 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(std::ostream & os, unsigned upper_precedence=0) const;
+       bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const;
+};
+
 
 // global functions
 inline const clifford &ex_to_clifford(const ex &e)
@@ -94,10 +84,19 @@ inline const clifford &ex_to_clifford(const ex &e)
        return static_cast<const clifford &>(*e.bp);
 }
 
-clifford clifford_gamma(const ex & mu);
 
-#ifndef NO_NAMESPACE_GINAC
+/** Create a Clifford unity object.
+ *
+ *  @return newly constructed object */
+ex dirac_one(void);
+
+/** 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 NO_NAMESPACE_GINAC
 
 #endif // ndef __GINAC_CLIFFORD_H__