* 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
#define __GINAC_IDX_H__
#include "ex.h"
+#include "numeric.h"
namespace GiNaC {
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) */
// utility functions
-/** Return the idx object handled by an ex. Deprecated: use ex_to<idx>().
- * This is unsafe: you need to check the type first. */
-inline const idx &ex_to_idx(const ex & e)
-{
- return static_cast<const idx &>(*e.bp);
-}
-
-/** Return the varidx object handled by an ex. Deprecated: use ex_to<varidx>().
- * This is unsafe: you need to check the type first. */
-inline const varidx &ex_to_varidx(const ex & e)
-{
- return static_cast<const varidx &>(*e.bp);
-}
-
-/** Return the spinidx object handled by an ex. Deprecated: use ex_to<spinidx>().
- * This is unsafe: you need to check the type first. */
-inline const spinidx &ex_to_spinidx(const ex & e)
-{
- return static_cast<const spinidx &>(*e.bp);
-}
-
/** Specialization of is_exactly_a<idx>(obj) for idx objects. */
template<> inline bool is_exactly_a<idx>(const basic & obj)
{