* Definition of expression pairs (building blocks of expairseq). */
/*
- * GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2002 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
#include "ex.h"
#include "numeric.h"
+#include "print.h"
namespace GiNaC {
~expair() { }
expair(const expair & other) : rest(other.rest), coeff(other.coeff)
{
- GINAC_ASSERT(is_ex_exactly_of_type(coeff,numeric));
+ GINAC_ASSERT(is_exactly_a<numeric>(coeff));
}
const expair & operator=(const expair & other)
{
/** Construct an expair from two ex. */
expair(const ex & r, const ex & c) : rest(r), coeff(c)
{
- GINAC_ASSERT(is_ex_exactly_of_type(coeff,numeric));
+ GINAC_ASSERT(is_exactly_a<numeric>(coeff));
}
/** Member-wise check for canonical ordering equality. */
return coeff.compare(other.coeff);
}
- /** Output to ostream in ugly raw format. */
- void printraw(std::ostream & os) const
- {
- os << "expair(";
- rest.printraw(os);
- os << ",";
- coeff.printraw(os);
- os << ")";
- }
+ void print(std::ostream & os) const;
/** True if this is of the form (numeric,ex(1)). */
bool is_canonical_numeric(void) const
{
- GINAC_ASSERT(is_ex_exactly_of_type(coeff,numeric));
- return (is_ex_exactly_of_type(rest,numeric) &&
- (coeff.is_equal(1)));
+ GINAC_ASSERT(is_exactly_a<numeric>(coeff));
+ return (is_exactly_a<numeric>(rest) && (coeff.is_equal(1)));
+ }
+
+ /** Swap contents with other expair. */
+ void swap(expair & other)
+ {
+ rest.swap(other.rest);
+ coeff.swap(other.coeff);
}
ex rest; ///< first member of pair, an arbitrary expression
ex coeff; ///< second member of pair, must be numeric
};
-/** Function object for insertion into third argument of STL's sort() etc. */
-class expair_is_less
-{
-public:
- bool operator()(const expair &lh, const expair &rh) const
- {
- return lh.is_less(rh);
- }
+/** Function objects for insertion into third argument of STL's sort() etc. */
+struct expair_is_less : public std::binary_function<expair, expair, bool> {
+ bool operator()(const expair &lh, const expair &rh) const { return lh.is_less(rh); }
+};
+
+struct expair_swap : public std::binary_function<expair, expair, void> {
+ void operator()(expair &lh, expair &rh) const { lh.swap(rh); }
};
+inline void swap(expair & e1, expair & e2)
+{ e1.swap(e2); }
+
+// This makes STL algorithms use the more efficient swap operation for ex objects
+inline void iter_swap(std::vector<expair>::iterator i1, std::vector<expair>::iterator i2)
+{ i1->swap(*i2); }
+
} // namespace GiNaC
#endif // ndef __GINAC_EXPAIR_H__