X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fexpair.h;h=513dd5c96442b294f1d4a2a755196155a8459334;hp=925db97230ea8f471416b27ccedfe9a1328f6925;hb=e187ba694051c0fcdb4e7aa3152a54c87c3c8e21;hpb=1ebd5f62696a5144e8249127d958bd1d3004857f

diff --git a/ginac/expair.h b/ginac/expair.h
index 925db972..513dd5c9 100644
--- a/ginac/expair.h
+++ b/ginac/expair.h
@@ -102,11 +102,19 @@ public:
 	ex coeff;   ///< second member of pair, must be numeric
 };
 
-/** Function objects for insertion into third argument of STL's sort() etc. */
+/** Function object 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); }
 };
 
+/** Function object not caring about the numerical coefficients for insertion
+ *  into third argument of STL's sort().  Note that this does not define a
+ *  strict weak ordering since for any symbol x we have neither 3*x<2*x or
+ *  2*x<3*x.  Handle with care! */
+struct expair_rest_is_less : public std::binary_function<expair, expair, bool> {
+	bool operator()(const expair &lh, const expair &rh) const { return (lh.rest.compare(rh.rest)<0); }
+};
+
 struct expair_swap : public std::binary_function<expair, expair, void> {
 	void operator()(expair &lh, expair &rh) const { lh.swap(rh); }
 };