From 5900bdf0f6adf9b01b7e6d3844d4ef1e4b3009c7 Mon Sep 17 00:00:00 2001
From: tqcq <99722391+tqcq@users.noreply.github.com>
Date: Tue, 5 Mar 2024 09:44:42 +0800
Subject: [PATCH] fix remove std::transform

---
 src/strings/utils.cc | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/src/strings/utils.cc b/src/strings/utils.cc
index 6a419a7..05a3651 100644
--- a/src/strings/utils.cc
+++ b/src/strings/utils.cc
@@ -19,19 +19,17 @@ ToUpper(char c)
 std::string
 ToLower(const std::string &str)
 {
-    std::string result;
-    std::transform(str.begin(), str.end(), std::back_inserter(result),
-                   ::tolower);
-    return result;
+    std::stringstream ss;
+    for (auto &ch : str) { ss << ToLower(ch); }
+    return ss.str();
 }
 
 std::string
 ToUpper(const std::string &str)
 {
-    std::string result;
-    std::transform(str.begin(), str.end(), std::back_inserter(result),
-                   ::toupper);
-    return result;
+    std::stringstream ss;
+    for (auto &ch : str) { ss << ToUpper(ch); }
+    return ss.str();
 }
 
 std::string