From f0cc4ef72bdc7d71cbfc1f475c85c97c8c97b3a7 Mon Sep 17 00:00:00 2001
From: HenryLee <lee0906@hotmail.com>
Date: Sat, 27 May 2017 01:56:20 +1000
Subject: [PATCH] Override n + iterator operator in the iterator

---
 src/json.hpp | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/json.hpp b/src/json.hpp
index 6dfc1831f..1a1f6fb25 100644
--- a/src/json.hpp
+++ b/src/json.hpp
@@ -9317,18 +9317,29 @@ class basic_json
         @brief  add to iterator
         @pre The iterator is initialized; i.e. `m_object != nullptr`.
         */
-        iter_impl operator+(difference_type i)
+        iter_impl operator+(difference_type i) const
         {
             auto result = *this;
             result += i;
             return result;
         }
 
+        /*!
+        @brief  addition of distance and iterator
+        @pre The iterator is initialized; i.e. `m_object != nullptr`.
+        */
+        friend iter_impl operator+(difference_type i, const iter_impl& it)
+        {
+            auto result = it;
+            result += i;
+            return result;
+        }
+
         /*!
         @brief  subtract from iterator
         @pre The iterator is initialized; i.e. `m_object != nullptr`.
         */
-        iter_impl operator-(difference_type i)
+        iter_impl operator-(difference_type i) const
         {
             auto result = *this;
             result -= i;