From 61256d9b8f5bc185c43ada5ca1e1d2056a2a7a16 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Offringa?= <offringa@gmail.com>
Date: Thu, 3 Aug 2023 20:42:04 +0200
Subject: [PATCH] Replace deprecated pre-C++11 code

The functions std::binary_function and std::mem_fun have been deprecated in C++11, and are removed in C++20. This pull request replaces them with more modern code. Together with #1889 this removes all warnings on recent compilers.
---
 common/utils/StringUtils.cpp | 4 ++--
 include/ola/ExportMap.h      | 3 +--
 include/olad/Plugin.h        | 3 +--
 3 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/common/utils/StringUtils.cpp b/common/utils/StringUtils.cpp
index bc27b623fb..2897918acd 100644
--- a/common/utils/StringUtils.cpp
+++ b/common/utils/StringUtils.cpp
@@ -403,12 +403,12 @@ bool HexStringToInt(const string &value, int32_t *output) {
 
 void ToLower(string *s) {
   std::transform(s->begin(), s->end(), s->begin(),
-                 std::ptr_fun<int, int>(std::tolower));
+                 [](int value){return std::tolower(value);});
 }
 
 void ToUpper(string *s) {
   std::transform(s->begin(), s->end(), s->begin(),
-                 std::ptr_fun<int, int>(std::toupper));
+                 [](int value){return std::toupper(value);});
 }
 
 void CapitalizeLabel(string *s) {
diff --git a/include/ola/ExportMap.h b/include/ola/ExportMap.h
index 284eb9ae3d..3e4e810d46 100644
--- a/include/ola/ExportMap.h
+++ b/include/ola/ExportMap.h
@@ -77,8 +77,7 @@ class BaseVariable {
   std::string m_name;
 };
 
-struct VariableLessThan: public std::binary_function<BaseVariable*,
-                                                     BaseVariable*, bool> {
+struct VariableLessThan {
   bool operator()(BaseVariable *x, BaseVariable *y) {
     return x->Name() < y->Name();
   }
diff --git a/include/olad/Plugin.h b/include/olad/Plugin.h
index 623718a2ca..163e0ad772 100644
--- a/include/olad/Plugin.h
+++ b/include/olad/Plugin.h
@@ -107,8 +107,7 @@ class AbstractPlugin {
 };
 
 
-struct PluginLessThan: public std::binary_function<AbstractPlugin*,
-                                                   AbstractPlugin*, bool> {
+struct PluginLessThan {
   bool operator()(AbstractPlugin *x, AbstractPlugin *y) {
     return x->Id() < y->Id();
   }