From 9bbd58c6ad6e9522e9caf11299049981f0298cc7 Mon Sep 17 00:00:00 2001
From: Pranav Srinivas Kumar <pranav.srinivas.kumar@gmail.com>
Date: Fri, 8 May 2020 14:27:20 -0500
Subject: [PATCH] Closes #76

---
 include/argparse.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/argparse.hpp b/include/argparse.hpp
index 701cd0a..d4c3e48 100644
--- a/include/argparse.hpp
+++ b/include/argparse.hpp
@@ -859,7 +859,7 @@ public:
    * Used in conjuction with Argument.operator== e.g., parser["foo"] == true
    * @throws std::logic_error in case of an invalid argument name
    */
-  Argument &operator[](std::string_view aArgumentName) {
+  Argument &operator[](std::string_view aArgumentName) const {
     auto tIterator = mArgumentMap.find(aArgumentName);
     if (tIterator != mArgumentMap.end()) {
       return *(tIterator->second);