From cc1f44f7bd00118a040bb676a8649d069b4958fd Mon Sep 17 00:00:00 2001
From: zhupengfei <zhupengfei321@sina.cn>
Date: Wed, 25 Jul 2018 08:03:43 +0800
Subject: [PATCH] common/string_utils: replace boost::transform with std
 counterpart

Note: according to cppreference it is necessary to convert char to unsigned char when using std::tolower and std::toupper, otherwise the behaviour would be undefined.
---
 src/common/string_util.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/common/string_util.cpp b/src/common/string_util.cpp
index a31ed3a8d..3a68a7391 100644
--- a/src/common/string_util.cpp
+++ b/src/common/string_util.cpp
@@ -2,12 +2,12 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <algorithm>
 #include <cctype>
 #include <cerrno>
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
-#include <boost/range/algorithm/transform.hpp>
 #include "common/common_paths.h"
 #include "common/logging/log.h"
 #include "common/string_util.h"
@@ -24,13 +24,15 @@ namespace Common {
 
 /// Make a string lowercase
 std::string ToLower(std::string str) {
-    boost::transform(str, str.begin(), ::tolower);
+    std::transform(str.begin(), str.end(), str.begin(),
+                   [](unsigned char c) { return std::tolower(c); });
     return str;
 }
 
 /// Make a string uppercase
 std::string ToUpper(std::string str) {
-    boost::transform(str, str.begin(), ::toupper);
+    std::transform(str.begin(), str.end(), str.begin(),
+                   [](unsigned char c) { return std::toupper(c); });
     return str;
 }