-#ifndef GINAC_COLLECT_VARGS_HPP
-#define GINAC_COLLECT_VARGS_HPP
+/** @file collect_vargs.h
+ *
+ * Interface to utility functions. */
+
+/*
+ * GiNaC Copyright (C) 1999-2015 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
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef GINAC_COLLECT_VARGS_H
+#define GINAC_COLLECT_VARGS_H
+
#include "ex.h"
+
#include <cln/integer.h>
+#include <utility> // for std::pair
#include <vector>
-#include <utility> // std::pair
+#include <algorithm> // std::lexicographical_compare
-namespace GiNaC
-{
+namespace GiNaC {
typedef std::vector<int> exp_vector_t;
-typedef std::vector<std::pair<exp_vector_t, ex> > ex_collect_t;
+
+static inline bool operator<(const exp_vector_t& v1, const exp_vector_t& v2)
+{
+ return std::lexicographical_compare(v1.rbegin(), v1.rend(),
+ v2.rbegin(), v2.rend());
+}
+
+static inline bool operator>(const exp_vector_t& v1, const exp_vector_t& v2)
+{
+ if (v1 == v2)
+ return false;
+ return !(v1 < v2);
+}
+
+static inline bool zerop(const exp_vector_t& v)
+{
+ for (auto & i : v) {
+ if (i != 0)
+ return false;
+ }
+ return true;
+}
+
+typedef std::vector<std::pair<exp_vector_t, ex>> ex_collect_t;
extern void
collect_vargs(ex_collect_t& ec, const ex& e, const exvector& x);
*/
extern ex lcoeff_wrt(ex e, const exvector& x);
+
+/**
+ * Degree vector of a leading term of a multivariate polynomial.
+ * (generalization of degree(expr, var))
+ */
+extern exp_vector_t degree_vector(ex e, const exvector& vars);
+
/**
* Leading coefficient c \in R (where R = Z or Z_p) of a multivariate
* polynomial e \in R[x_0, \ldots, x_n]
} // namespace GiNaC
-#endif /* GINAC_COLLECT_VARGS_HPP */
+#endif // ndef GINAC_COLLECT_VARGS_H