[C++17] Remove inheritance from std::binary_function, std::unary_function.

[ginac.git] / ginac / clifford.cpp

diff --git a/ginac/clifford.cpp b/ginac/clifford.cpp
index ab40064ffd86588f1dc6514a17fd4e8c561be495..7ab99281e7db0909fb5cd178c01cf8f3bb06ea03 100644 (file)
--- a/ginac/clifford.cpp
+++ b/ginac/clifford.cpp
@@ -340,7 +340,7 @@ static void base_and_index(const ex & c, ex & b, ex & i)
 }
 
 /** Predicate for finding non-clifford objects. */
-struct is_not_a_clifford : public std::unary_function<ex, bool> {
+struct is_not_a_clifford {
        bool operator()(const ex & e)
        {
                return !is_a<clifford>(e);