From 8f9d3b937ca7084fcdb9f1b6b4fa93aa1327c628 Mon Sep 17 00:00:00 2001 From: Benjamin Kramer Date: Thu, 21 May 2020 15:22:33 +0200 Subject: [PATCH] [StringRef] Use some trickery to avoid initializing the std::string returned by upper()/lower() --- llvm/lib/Support/StringRef.cpp | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/llvm/lib/Support/StringRef.cpp b/llvm/lib/Support/StringRef.cpp index 6ae2a2b..ab67ef9 100644 --- a/llvm/lib/Support/StringRef.cpp +++ b/llvm/lib/Support/StringRef.cpp @@ -106,19 +106,13 @@ unsigned StringRef::edit_distance(llvm::StringRef Other, //===----------------------------------------------------------------------===// std::string StringRef::lower() const { - std::string Result(size(), char()); - for (size_type i = 0, e = size(); i != e; ++i) { - Result[i] = toLower(Data[i]); - } - return Result; + return std::string(map_iterator(begin(), toLower), + map_iterator(end(), toLower)); } std::string StringRef::upper() const { - std::string Result(size(), char()); - for (size_type i = 0, e = size(); i != e; ++i) { - Result[i] = toUpper(Data[i]); - } - return Result; + return std::string(map_iterator(begin(), toUpper), + map_iterator(end(), toUpper)); } //===----------------------------------------------------------------------===// -- 2.7.4