* Happy New Year(s)!

[ginac.git] / ginac / tensor.h

diff --git a/ginac/tensor.h b/ginac/tensor.h
index 5698b9b944450e44852b3571cb610dd0051b95ec..162ca0fede85e8660187f8bc2ed4c4ddfe7755c7 100644 (file)
--- a/ginac/tensor.h
+++ b/ginac/tensor.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's special tensors. */
 
 /*
- *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2007 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
@@ -17,7 +17,7 @@
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #ifndef __GINAC_TENSOR_H__
@@ -37,11 +37,18 @@ class tensor : public basic
 
        // other constructors
 protected:
-       tensor(unsigned ti);
+       tensor(tinfo_t ti) : inherited(ti) {}
 
-       // functions overriding virtual functions from bases classes
+       // functions overriding virtual functions from base classes
 protected:
-       unsigned return_type(void) const { return return_types::noncommutative_composite; }
+       unsigned return_type() const { return return_types::noncommutative_composite; }
+
+       // non-virtual functions in this class
+public:
+       /** Replace dummy index in contracted-with object by the contracting
+        *  object's second index (used internally for delta and metric tensor
+        *  contractions. */
+       bool replace_contr_index(exvector::iterator self, exvector::iterator other) const;
 };
 
 
@@ -51,11 +58,17 @@ class tensdelta : public tensor
 {
        GINAC_DECLARE_REGISTERED_CLASS(tensdelta, 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 info(unsigned inf) const;
        ex eval_indexed(const basic & i) const;
        bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const;
+
+       // non-virtual functions in this class
+protected:
+       unsigned return_type() const { return return_types::commutative; }
+       void do_print(const print_context & c, unsigned level) const;
+       void do_print_latex(const print_latex & c, unsigned level) const;
 };
 
 
@@ -66,11 +79,16 @@ class tensmetric : public tensor
 {
        GINAC_DECLARE_REGISTERED_CLASS(tensmetric, 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 info(unsigned inf) const;
        ex eval_indexed(const basic & i) const;
        bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const;
+
+       // non-virtual functions in this class
+protected:
+       unsigned return_type() const { return return_types::commutative; }
+       void do_print(const print_context & c, unsigned level) const;
 };
 
 
@@ -86,11 +104,17 @@ public:
        /** Construct Lorentz metric tensor with given signature. */
        minkmetric(bool pos_sig);
 
-       // 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 info(unsigned inf) const;
        ex eval_indexed(const basic & i) const;
 
+       // non-virtual functions in this class
+protected:
+       unsigned return_type() const { return return_types::commutative; }
+       void do_print(const print_context & c, unsigned level) const;
+       void do_print_latex(const print_latex & c, unsigned level) const;
+
        // member variables
 private:
        bool pos_sig; /**< If true, the metric is diag(-1,1,1...). Otherwise it is diag(1,-1,-1,...). */
@@ -105,11 +129,16 @@ class spinmetric : public tensmetric
 {
        GINAC_DECLARE_REGISTERED_CLASS(spinmetric, tensmetric)
 
-       // 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 info(unsigned inf) const;
        ex eval_indexed(const basic & i) const;
        bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const;
+
+       // non-virtual functions in this class
+protected:
+       void do_print(const print_context & c, unsigned level) const;
+       void do_print_latex(const print_latex & c, unsigned level) const;
 };
 
 
@@ -124,23 +153,26 @@ class tensepsilon : public tensor
 public:
        tensepsilon(bool minkowski, bool pos_sig);
 
-       // 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 info(unsigned inf) const;
        ex eval_indexed(const basic & i) const;
+       bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const;
+
+       // non-virtual functions in this class
+protected:
+       unsigned return_type() const { return return_types::commutative; }
+       void do_print(const print_context & c, unsigned level) const;
+       void do_print_latex(const print_latex & c, unsigned level) const;
 
        // member variables
 private:
        bool minkowski; /**< If true, tensor is in Minkowski-type space. Otherwise it is in a Euclidean space. */
-       bool pos_sig;  /**< If true, the metric is assumed to be diag(-1,1,1...). Otherwise it is diag(1,-1,-1,...). This is only relevant if minkowski = true. */
+       bool pos_sig;   /**< If true, the metric is assumed to be diag(-1,1,1...). Otherwise it is diag(1,-1,-1,...). This is only relevant if minkowski = true. */
 };
 
 
 // utility functions
-inline const tensor &ex_to_tensor(const ex &e)
-{
-       return static_cast<const tensor &>(*e.bp);
-}
 
 /** Create a delta tensor with specified indices. The indices must be of class
  *  idx or a subclass. The delta tensor is always symmetric and its trace is
@@ -209,18 +241,6 @@ ex epsilon_tensor(const ex & i1, const ex & i2, const ex & i3);
  *  @return newly constructed epsilon tensor */
 ex lorentz_eps(const ex & i1, const ex & i2, const ex & i3, const ex & i4, bool pos_sig = false);
 
-/** Create an epsilon tensor in a 4-dimensional projection of a D-dimensional
- *  Minkowski space. It vanishes whenever one of the indices is not in the
- *  set {0, 1, 2, 3}.
- *
- *  @param i1 First index
- *  @param i2 Second index
- *  @param i3 Third index
- *  @param i4 Fourth index
- *  @param pos_sig Whether the signature of the metric is positive
- *  @return newly constructed epsilon tensor */
-ex eps0123(const ex & i1, const ex & i2, const ex & i3, const ex & i4, bool pos_sig = false);
-
 } // namespace GiNaC
 
 #endif // ndef __GINAC_TENSOR_H__