X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?a=blobdiff_plain;ds=sidebyside;f=ginac%2Ftensor.h;h=8078b0937a130aec0a622a8ea1a85efb47587edd;hb=a8c81ff424cab3ac522a71665b0eda55a8ca2f4d;hp=02496ad9da5da77cdc1e38b8e7cdb76da5e7f5d6;hpb=cfea748404dec5fb2f2e3310d36eeb6640f13824;p=ginac.git

diff --git a/ginac/tensor.h b/ginac/tensor.h
index 02496ad9..8078b093 100644
--- 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) 1999-2005 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__
@@ -41,7 +41,14 @@ protected:
 
 	// 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;
 };
 
 
@@ -53,9 +60,13 @@ class tensdelta : public tensor
 
 	// functions overriding virtual functions from base classes
 public:
-	void print(const print_context & c, unsigned level = 0) 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;
 };
 
 
@@ -68,9 +79,12 @@ class tensmetric : public tensor
 
 	// functions overriding virtual functions from base classes
 public:
-	void print(const print_context & c, unsigned level = 0) 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;
 };
 
 
@@ -88,9 +102,13 @@ public:
 
 	// functions overriding virtual functions from base classes
 public:
-	void print(const print_context & c, unsigned level = 0) const;
 	ex eval_indexed(const basic & i) 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;
+
 	// member variables
 private:
 	bool pos_sig; /**< If true, the metric is diag(-1,1,1...). Otherwise it is diag(1,-1,-1,...). */
@@ -107,9 +125,13 @@ class spinmetric : public tensmetric
 
 	// functions overriding virtual functions from base classes
 public:
-	void print(const print_context & c, unsigned level = 0) 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;
 };
 
 
@@ -126,14 +148,18 @@ public:
 
 	// functions overriding virtual functions from base classes
 public:
-	void print(const print_context & c, unsigned level = 0) 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;
+
 	// 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. */
 };
 
 
@@ -206,18 +232,6 @@ 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__