- dirac_trace() handles arbitrary expressions (even unexpanded), including

[ginac.git] / ginac / tensor.h

diff --git a/ginac/tensor.h b/ginac/tensor.h
index ac991d5f666f5e47d621e1829bdf5f3bd4b2c048..b077ee4d0c927d8e459250bb0092773b8c876163 100644 (file)
--- a/ginac/tensor.h
+++ b/ginac/tensor.h
@@ -40,8 +40,6 @@ protected:
        tensor(unsigned ti);
 
        // functions overriding virtual functions from bases classes
-public:
-       ex subs(const lst & ls, const lst & lr) const;
 protected:
        unsigned return_type(void) const { return return_types::noncommutative_composite; }
 };
@@ -55,7 +53,7 @@ class tensdelta : public tensor
 
        // functions overriding virtual functions from bases classes
 public:
-       void print(std::ostream & os, unsigned upper_precedence=0) const;
+       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;
 };
@@ -70,7 +68,7 @@ class tensmetric : public tensor
 
        // functions overriding virtual functions from bases classes
 public:
-       void print(std::ostream & os, unsigned upper_precedence=0) const;
+       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;
 };
@@ -90,7 +88,7 @@ public:
 
        // functions overriding virtual functions from bases classes
 public:
-       void print(std::ostream & os, unsigned upper_precedence=0) const;
+       void print(const print_context & c, unsigned level = 0) const;
        ex eval_indexed(const basic & i) const;
 
        // member variables
@@ -112,7 +110,7 @@ public:
 
        // functions overriding virtual functions from bases classes
 public:
-       void print(std::ostream & os, unsigned upper_precedence=0) const;
+       void print(const print_context & c, unsigned level = 0) const;
        ex eval_indexed(const basic & i) const;
 
        // member variables
@@ -185,6 +183,18 @@ 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__