From a3d0a0419a35bef9b80a6a12432ab30e2d1e0f5a Mon Sep 17 00:00:00 2001
From: Tomas Volf <~@wolfsden.cz>
Date: Tue, 5 Mar 2024 22:27:42 +0100
Subject: [PATCH] gm_utils.h: Drop std::unary_function.

I am not sure what it does, it is deprecated/removed (depending on C++ version)
and the advice seems to be that is just is not necessary.  So just remove it.

* src/gm_utils.h (print_f, pair_print_f): Drop std::unary_function.
---
 src/gm_utils.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/src/gm_utils.h
+++ b/src/gm_utils.h
@@ -117,7 +117,7 @@ bool string_contains(const char *s, cons
  * Function object to print something into a stream (to be used with for_each)
  */
 template<class T>
-struct print_f : public std::unary_function<T, void>
+struct print_f
 {
     print_f(std::ostream& out, const string &s = ", ") : os(out), sep(s) {}
     void operator() (T x) { os << x << sep; }
@@ -129,7 +129,7 @@ struct print_f : public std::unary_funct
  * Function object to print a pair into two streams (to be used with for_each)
  */
 template<class T>
-struct pair_print_f : public std::unary_function<T, void>
+struct pair_print_f
 {
     pair_print_f(std::ostream& out1, std::ostream& out2, const string &s = ", ") :
         os1(out1), os2(out2), sep(s) {}