X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fidx.h;h=2941fa96724fba23cfecdc36e9bca983757190d5;hp=334b58cadb1ab1abe795a885f893765c00cc0314;hb=7cbe7effc515e4575b4d1fd1d6d75f0148eb8a89;hpb=956eeb82c513a723e864edefa857133282cf692b;ds=sidebyside

diff --git a/ginac/idx.h b/ginac/idx.h
index 334b58ca..2941fa96 100644
--- a/ginac/idx.h
+++ b/ginac/idx.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's indices. */
 
 /*
- *  GiNaC Copyright (C) 1999-2000 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2001 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
@@ -32,69 +32,77 @@
 namespace GiNaC {
 #endif // ndef NO_NAMESPACE_GINAC
 
+
+/** This class holds one index of an indexed object. Indices can be symbolic
+ *  (e.g. "mu", "i") or numeric (unsigned integer), and they can be contravariant
+ *  (the default) or covariant. */
 class idx : public basic
 {
-    GINAC_DECLARE_REGISTERED_CLASS(idx, basic)
-
-// member functions
+	GINAC_DECLARE_REGISTERED_CLASS(idx, basic)
 
-    // default constructor, destructor, copy constructor assignment operator and helpers
+	// default constructor, destructor, copy constructor assignment operator and helpers
 public:
-    idx();
-    ~idx();
-    idx (const idx & other);
-    const idx & operator=(const idx & other);
+	idx();
+	~idx();
+	idx (const idx & other);
+	const idx & operator=(const idx & other);
 protected:
-    void copy(const idx & other);
-    void destroy(bool call_parent);
+	void copy(const idx & other);
+	void destroy(bool call_parent);
 
-    // other constructors
+	// other constructors
 public:
-    explicit idx(bool cov);
-    explicit idx(const string & n, bool cov=false);
-    explicit idx(const char * n, bool cov=false);
-    explicit idx(unsigned v, bool cov=false); 
+	explicit idx(bool cov);
+	explicit idx(const std::string & n, bool cov=false);
+	explicit idx(const char * n, bool cov=false);
+	explicit idx(unsigned v, bool cov=false); 
 
-    // functions overriding virtual functions from bases classes
+	// functions overriding virtual functions from bases classes
 public:
-    basic * duplicate() const;
-    void printraw(ostream & os) const;
-    void printtree(ostream & os, unsigned indent) const;
-    void print(ostream & os, unsigned upper_precedence=0) const;
-    bool info(unsigned inf) const;
+	basic * duplicate() const;
+	void printraw(std::ostream & os) const;
+	void printtree(std::ostream & os, unsigned indent) const;
+	void print(std::ostream & os, unsigned upper_precedence=0) const;
+	bool info(unsigned inf) const;
 protected:
-    int compare_same_type(const basic & other) const;
-    bool is_equal_same_type(const basic & other) const;
-    unsigned calchash(void) const;
-    ex subs(const lst & ls, const lst & lr) const;
+	int compare_same_type(const basic & other) const;
+	bool is_equal_same_type(const basic & other) const;
+	unsigned calchash(void) const;
+	ex subs(const lst & ls, const lst & lr) const;
 
-    // new virtual functions which can be overridden by derived classes
+	// new virtual functions which can be overridden by derived classes
 public:
-    virtual bool is_co_contra_pair(const basic & other) const;
-    virtual ex toggle_covariant(void) const;
+	virtual bool is_co_contra_pair(const basic & other) const;
+	virtual ex toggle_covariant(void) const;
 
-    // non-virtual functions in this class
+	// non-virtual functions in this class
 public:
-    bool is_symbolic(void) const;
-    unsigned get_value(void) const;
-    bool is_covariant(void) const;
-    void setname(const string & n) {name=n;}
-    string getname(void) const {return name;}
+	/** Check whether index is symbolic (not numeric). */
+	bool is_symbolic(void) const {return symbolic;}
+
+	/** Get numeric value of index. Undefined for symbolic indices. */
+	unsigned get_value(void) const {return value;}
 
-    // member variables
+	/** Check whether index is covariant (not contravariant). */
+	bool is_covariant(void) const {return covariant;}
+
+	void setname(const std::string & n) {name=n;}
+	std::string getname(void) const {return name;}
+
+	// member variables
 protected:
-    unsigned serial;
-    bool symbolic;
-    string name;
-    unsigned value;
-    static unsigned next_serial;
-    bool covariant; // x_mu, default is contravariant: x^mu
+	unsigned serial;
+	bool symbolic;    /**< Is index symbolic? */
+	std::string name; /**< Symbolic name (if symbolic == true) */
+	unsigned value;   /**< Numeric value (if symbolic == false) */
+	static unsigned next_serial;
+	bool covariant;   /**< x_mu, default is contravariant: x~mu */
 };
 
 // global constants
 
 extern const idx some_idx;
-extern const type_info & typeid_idx;
+extern const std::type_info & typeid_idx;
 
 // utility functions
 inline const idx &ex_to_idx(const ex &e)
@@ -104,15 +112,11 @@ inline const idx &ex_to_idx(const ex &e)
 
 // global functions
 
-// typedef vector<ex> exvector;
-
 int canonicalize_indices(exvector & iv, bool antisymmetric=false);
 exvector idx_intersect(const exvector & iv1, const exvector & iv2);
-ex permute_free_index_to_front(const exvector & iv3, const exvector & iv2,
-                               bool antisymmetric, int * sig);
+ex permute_free_index_to_front(const exvector & iv3, const exvector & iv2, int * sig);
 unsigned subs_index_in_exvector(exvector & v, const ex & is, const ex & ir);
-ex subs_indices(const ex & e, const exvector & idxv_contra,
-                const exvector & idxv_co);
+ex subs_indices(const ex & e, const exvector & idxv_contra, const exvector & idxv_co);
 unsigned count_index(const ex & e, const ex & i);
 
 #ifndef NO_NAMESPACE_GINAC