From 9007958c1f3600507e3d30f9f86ebf51b6f302f0 Mon Sep 17 00:00:00 2001
From: Zhihao Yuan <lichray@gmail.com>
Date: Sat, 16 Nov 2019 13:50:34 -0600
Subject: [PATCH] Index arguments without storing their names twice

---
 include/argparse.hpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/argparse.hpp b/include/argparse.hpp
index 8317181..a6eae15 100644
--- a/include/argparse.hpp
+++ b/include/argparse.hpp
@@ -39,6 +39,7 @@ SOFTWARE.
 #include <sstream>
 #include <stdexcept>
 #include <string>
+#include <string_view>
 #include <tuple>
 #include <type_traits>
 #include <variant>
@@ -581,13 +582,13 @@ private:
 
   void index_argument(list_iterator argIt) {
     for (auto &mName : std::as_const(argIt->mNames))
-      mArgumentMap.insert_or_assign(mName, argIt);
+      mArgumentMap.emplace(mName, argIt);
   }
 
   std::string mProgramName;
   std::list<Argument> mPositionalArguments;
   std::list<Argument> mOptionalArguments;
-  std::map<std::string, list_iterator, std::less<>> mArgumentMap;
+  std::map<std::string_view, list_iterator, std::less<>> mArgumentMap;
 };
 
 } // namespace argparse