From f2873e6d3a46847126c03ac754dd9993d32a98a5 Mon Sep 17 00:00:00 2001
From: Jared Grubb <jaredgrubb@gmail.com>
Date: Sun, 29 Jan 2017 02:46:58 +0000
Subject: [PATCH] README: adjust boost::optional example

The "from_json" example for boost::optional is not complete and should also handle the 'none' case.
---
 README.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 1ee358e5b..6451e2c55 100644
--- a/README.md
+++ b/README.md
@@ -563,7 +563,9 @@ namespace nlohmann {
         }
 
         static void from_json(const json& j, boost::optional<T>& opt) {
-            if (!j.is_null()) {
+            if (j.is_null()) {
+                opt = boost::none;
+            } else {
                 opt = j.get<T>(); // same as above, but with 
                                   // adl_serializer<T>::from_json
             }