[C++17] Convert std::mem_fun_ref_t to std::mem_fn...

...because it has been deprecated in C++11.

diff --git a/ginac/archive.cpp b/ginac/archive.cpp
index f2b6f1e9bd81670b9561c9c056ab3783cf42bc35..29585a24ae1473ffcc31382b21d745c203068d88 100644 (file)
--- a/ginac/archive.cpp
+++ b/ginac/archive.cpp
@@ -609,7 +609,7 @@ void archive::clear()
 /** Delete cached unarchived expressions in all archive_nodes (mainly for debugging). */
 void archive::forget()
 {
-       for_each(nodes.begin(), nodes.end(), std::mem_fun_ref(&archive_node::forget));
+       for_each(nodes.begin(), nodes.end(), std::mem_fn(&archive_node::forget));
 }
 
 /** Delete cached unarchived expressions from node (for debugging). */