From b11d2cecedcee7b40b76332bd72fe76c9ff671b8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=B6=99=E4=BF=A1=E8=AA=A0?= <alan12345678933@gmail.com>
Date: Mon, 3 May 2021 13:39:30 +0800
Subject: [PATCH] Fixed cppcheck warning

Parameter 'val' can be declared with const in cppcheck.
---
 single_include/nlohmann/json.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index b3c568b1a..009b29884 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -5937,7 +5937,7 @@ class json_sax_dom_parser
         return true;
     }
 
-    bool key(string_t& val)
+    bool key(const string_t& val)
     {
         // add null at given key and store the reference for later
         object_element = &(ref_stack.back()->m_value.object->operator[](val));