From e2e1e53d4258b13f84480614c1da946483966139 Mon Sep 17 00:00:00 2001
From: Mathew Sutcliffe <oktal3700@gmail.com>
Date: Tue, 23 Aug 2016 17:12:33 +0100
Subject: [PATCH] refs #721 Avoid looking up the JSON object key twice every
 time.

---
 src/blackmisc/json.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/blackmisc/json.h b/src/blackmisc/json.h
index 34557e46e..243f7184a 100644
--- a/src/blackmisc/json.h
+++ b/src/blackmisc/json.h
@@ -305,7 +305,8 @@ namespace BlackMisc
                 auto meta = introspect<Derived>().without(MetaFlags<DisabledForJson>());
                 meta.forEachMemberName(*derived(), [ & ](auto & member, const QString & name)
                 {
-                    if (json.contains(name)) { json.value(name) >> member; }
+                    auto it = json.find(name);
+                    if (it != json.end()) { it.value() >> member; }
                 });
             }