X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fidx.h;h=3811a4efe400123bc1d0f63303b87ec36ef3fc7b;hp=aa7f94e1fdf3fa89ae8846e96de0b04db5855854;hb=dc9588b89a3f53b0d63b0a80ee7d67a98580c067;hpb=61b8ecb02c8212efbc15f59face8a9c620dc823c

diff --git a/ginac/idx.h b/ginac/idx.h
index aa7f94e1..3811a4ef 100644
--- a/ginac/idx.h
+++ b/ginac/idx.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's indices. */
 
 /*
- *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2003 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
@@ -24,6 +24,7 @@
 #define __GINAC_IDX_H__
 
 #include "ex.h"
+#include "numeric.h"
 
 namespace GiNaC {
 
@@ -45,14 +46,18 @@ public:
 	 *  @return newly constructed index */
 	explicit idx(const ex & v, const ex & dim);
 
-	// functions overriding virtual functions from bases classes
+	// functions overriding virtual functions from base classes
 public:
-	void printraw(std::ostream & os) const;
-	void printtree(std::ostream & os, unsigned indent) const;
-	void print(std::ostream & os, unsigned upper_precedence=0) const;
+	void print(const print_context & c, unsigned level = 0) const;
 	bool info(unsigned inf) const;
+	unsigned nops() const;
+	ex & let_op(int i);
+	ex evalf(int level = 0) const;
+	ex subs(const lst & ls, const lst & lr, bool no_pattern = false) const;
+
 protected:
-	ex subs(const lst & ls, const lst & lr) const;
+	ex derivative(const symbol & s) const;
+	bool match_same_type(const basic & other) const;
 
 	// new virtual functions in this class
 public:
@@ -66,19 +71,26 @@ public:
 	ex get_value(void) const {return value;}
 
 	/** Check whether the index is numeric. */
-	bool is_numeric(void) const {return is_ex_exactly_of_type(value, numeric);}
+	bool is_numeric(void) const {return is_exactly_a<numeric>(value);}
 
 	/** Check whether the index is symbolic. */
-	bool is_symbolic(void) const {return !is_ex_exactly_of_type(value, numeric);}
+	bool is_symbolic(void) const {return !is_exactly_a<numeric>(value);}
 
 	/** Get dimension of index space. */
 	ex get_dim(void) const {return dim;}
 
 	/** Check whether the dimension is numeric. */
-	bool is_dim_numeric(void) const {return is_ex_exactly_of_type(dim, numeric);}
+	bool is_dim_numeric(void) const {return is_exactly_a<numeric>(dim);}
 
 	/** Check whether the dimension is symbolic. */
-	bool is_dim_symbolic(void) const {return !is_ex_exactly_of_type(dim, numeric);}
+	bool is_dim_symbolic(void) const {return !is_exactly_a<numeric>(dim);}
+
+	/** Make a new index with the same value but a different dimension. */
+	ex replace_dim(const ex & new_dim) const;
+
+	/** Return the minimum of the dimensions of this and another index.
+	 *  If this is undecidable, throw an exception. */
+	ex minimal_dim(const idx & other) const;
 
 protected:
 	ex value; /**< Expression that constitutes the index (numeric or symbolic name) */
@@ -102,11 +114,14 @@ public:
 	 *  @return newly constructed index */
 	varidx(const ex & v, const ex & dim, bool covariant = false);
 
-	// functions overriding virtual functions from bases classes
+	// functions overriding virtual functions from base classes
 public:
-	void print(std::ostream & os, unsigned upper_precedence=0) const;
+	void print(const print_context & c, unsigned level = 0) const;
 	bool is_dummy_pair_same_type(const basic & other) const;
 
+protected:
+	bool match_same_type(const basic & other) const;
+
 	// non-virtual functions in this class
 public:
 	/** Check whether the index is covariant. */
@@ -124,15 +139,74 @@ protected:
 };
 
 
+/** This class holds a spinor index that can be dotted or undotted and that
+ *  also has a variance. This is used in the Weyl-van-der-Waerden formalism
+ *  where the dot indicates complex conjugation. There is an associated
+ *  (asymmetric) metric tensor that can be used to raise/lower spinor
+ *  indices. */
+class spinidx : public varidx
+{
+	GINAC_DECLARE_REGISTERED_CLASS(spinidx, varidx)
+
+	// other constructors
+public:
+	/** Construct index with given value, dimension, variance and dot.
+	 *
+	 *  @param v Value of index (numeric or symbolic)
+	 *  @param dim Dimension of index space (numeric or symbolic)
+	 *  @param covariant Make covariant index (default is contravariant)
+	 *  @param dotted Make covariant dotted (default is undotted)
+	 *  @return newly constructed index */
+	spinidx(const ex & v, const ex & dim = 2, bool covariant = false, bool dotted = false);
+
+	// functions overriding virtual functions from base classes
+public:
+	void print(const print_context & c, unsigned level = 0) const;
+	bool is_dummy_pair_same_type(const basic & other) const;
+
+protected:
+	bool match_same_type(const basic & other) const;
+
+	// non-virtual functions in this class
+public:
+	/** Check whether the index is dotted. */
+	bool is_dotted(void) const {return dotted;}
+
+	/** Check whether the index is not dotted. */
+	bool is_undotted(void) const {return !dotted;}
+
+	/** Make a new index with the same value and variance but the opposite
+	 *  dottedness. */
+	ex toggle_dot(void) const;
+
+	/** Make a new index with the same value but opposite variance and
+	 *  dottedness. */
+	ex toggle_variance_dot(void) const;
+
+	// member variables
+protected:
+	bool dotted;
+};
+
+
 // utility functions
-inline const idx &ex_to_idx(const ex & e)
+
+/** Specialization of is_exactly_a<idx>(obj) for idx objects. */
+template<> inline bool is_exactly_a<idx>(const basic & obj)
+{
+        return obj.tinfo()==TINFO_idx;
+}
+
+/** Specialization of is_exactly_a<varidx>(obj) for varidx objects. */
+template<> inline bool is_exactly_a<varidx>(const basic & obj)
 {
-	return static_cast<const idx &>(*e.bp);
+        return obj.tinfo()==TINFO_varidx;
 }
 
-inline const varidx &ex_to_varidx(const ex & e)
+/** Specialization of is_exactly_a<spinidx>(obj) for spinidx objects. */
+template<> inline bool is_exactly_a<spinidx>(const basic & obj)
 {
-	return static_cast<const varidx &>(*e.bp);
+        return obj.tinfo()==TINFO_spinidx;
 }
 
 /** Check whether two indices form a dummy pair. */
@@ -189,9 +263,10 @@ inline unsigned count_free_indices(const exvector & v)
 	return free_indices.size();
 }
 
-/** Given two index vectors, find those indices that appear in the first
- *  vector but not in the second one (asymmetric set difference). */
-exvector index_set_difference(const exvector & set1, const exvector & set2);
+/** Return the minimum of two index dimensions. If this is undecidable,
+ *  throw an exception. Numeric dimensions are always considered "smaller"
+ *  than symbolic dimensions. */
+ex minimal_dim(const ex & dim1, const ex & dim2);
 
 } // namespace GiNaC