- epsilon*epsilon contractions work

[ginac.git] / ginac / clifford.h

diff --git a/ginac/clifford.h b/ginac/clifford.h
index 69c9e23a6685a3b19f42fbfa17b9bed4113a4431..50a0c70cdaa64b96fb68d7322b5b641c39a0a9ea 100644 (file)
--- a/ginac/clifford.h
+++ b/ginac/clifford.h
@@ -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;
@@ -94,18 +98,26 @@ 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
+
+/** 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)
 {
        return static_cast<const clifford &>(*e.bp);
 }
 
+/** Specialization of is_exactly_a<clifford>(obj) for clifford objects. */
+template<> inline bool is_exactly_a<clifford>(const basic & obj)
+{
+       return obj.tinfo()==TINFO_clifford;
+}
 
 /** Create a Clifford unity object.
  *
@@ -144,9 +156,15 @@ ex dirac_slash(const ex & e, const ex & dim, unsigned char rl = 0);
  *  In particular, the functional is not always cyclic in D != 4 dimensions
  *  when gamma5 is involved.
  *
- *  @param rl Representation label */
-ex dirac_trace(const ex & e, unsigned char rl = 0);
+ *  @param e Expression to take the trace of
+ *  @param rl Representation label
+ *  @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