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[ginac.git] / ginac / symmetry.cpp

diff --git a/ginac/symmetry.cpp b/ginac/symmetry.cpp
index c8c27a03c1221c4463d3c8f84c477de691234ecf..115df0bfe4924505dfc507eadf08754b592afada 100644 (file)
--- a/ginac/symmetry.cpp
+++ b/ginac/symmetry.cpp
@@ -3,7 +3,7 @@
  *  Implementation of GiNaC's symmetry definitions. */
 
 /*
- *  GiNaC Copyright (C) 1999-2016 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2019 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
@@ -389,7 +389,7 @@ const symmetry & antisymmetric4()
        return ex_to<symmetry>(s);
 }
 
-class sy_is_less : public std::binary_function<ex, ex, bool> {
+class sy_is_less {
        exvector::iterator v;
 
 public:
@@ -413,7 +413,7 @@ public:
        }
 };
 
-class sy_swap : public std::binary_function<ex, ex, void> {
+class sy_swap {
        exvector::iterator v;
 
 public: