QJsonObject::(const_)iterator: add pointer typedef

Otherwise they're unusable with std::algorithms or anything else
that requires iterator_traits.

Change-Id: Ia29c1e7c1778844e37d43eaa8aef2871afe3c991
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/json/qjsonobject.cpp

@@ -693,6 +693,11 @@ QJsonObject::const_iterator QJsonObject::constFind(const QString &key) const
     \internal
 */
 
+/*! \typedef QJsonObject::iterator::pointer
+
+    \internal
+*/
+
 /*! \fn QJsonObject::iterator::iterator()
 
     Constructs an uninitialized iterator.
@@ -895,6 +900,11 @@ QJsonObject::const_iterator QJsonObject::constFind(const QString &key) const
     \internal
 */
 
+/*! \typedef QJsonObject::const_iterator::pointer
+
+    \internal
+*/
+
 /*! \fn QJsonObject::const_iterator::const_iterator()
 
     Constructs an uninitialized iterator.

src/corelib/json/qjsonobject.h

@@ -104,6 +104,7 @@ public:
         typedef int difference_type;
         typedef QJsonValue value_type;
         typedef QJsonValueRef reference;
+        typedef QJsonValuePtr pointer;
 
         Q_DECL_CONSTEXPR inline iterator() : o(Q_NULLPTR), i(0) {}
         Q_DECL_CONSTEXPR inline iterator(QJsonObject *obj, int index) : o(obj), i(index) {}
@@ -146,6 +147,7 @@ public:
         typedef int difference_type;
         typedef QJsonValue value_type;
         typedef QJsonValue reference;
+        typedef QJsonValuePtr pointer;
 
         Q_DECL_CONSTEXPR inline const_iterator() : o(Q_NULLPTR), i(0) {}
         Q_DECL_CONSTEXPR inline const_iterator(const QJsonObject *obj, int index)