- dummy index renaming works better

[ginac.git] / ginac / tensor.h

diff --git a/ginac/tensor.h b/ginac/tensor.h
index 5698b9b944450e44852b3571cb610dd0051b95ec..e30a91a4dcf41ec84070f7ceeb0fca6b5f9fe949 100644 (file)
--- a/ginac/tensor.h
+++ b/ginac/tensor.h
@@ -39,7 +39,7 @@ class tensor : public basic
 protected:
        tensor(unsigned 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; }
 };
@@ -51,7 +51,7 @@ 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;
        ex eval_indexed(const basic & i) const;
@@ -66,7 +66,7 @@ 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;
        ex eval_indexed(const basic & i) const;
@@ -86,7 +86,7 @@ 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;
        ex eval_indexed(const basic & i) const;
@@ -105,7 +105,7 @@ 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;
        ex eval_indexed(const basic & i) const;
@@ -124,10 +124,11 @@ 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;
        ex eval_indexed(const basic & i) const;
+       bool contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const;
 
        // member variables
 private:
@@ -137,6 +138,9 @@ private:
 
 
 // utility functions
+
+/** Return the tensor object handled by an ex.  Deprecated: use ex_to<tensor>().
+ *  This is unsafe: you need to check the type first. */
 inline const tensor &ex_to_tensor(const ex &e)
 {
        return static_cast<const tensor &>(*e.bp);