Return JsonArray and JsonObject by value (closes #309)

src/ArduinoJson/JsonObjectData.hpp

@@ -0,0 +1,27 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#pragma once
+
+#include "Data/List.hpp"
+#include "Data/ValueSaver.hpp"
+#include "JsonPair.hpp"
+#include "Memory/JsonBufferAllocated.hpp"
+#include "Polyfills/type_traits.hpp"
+#include "Strings/StringTraits.hpp"
+
+// Returns the size (in bytes) of an object with n elements.
+// Can be very handy to determine the size of a StaticJsonBuffer.
+#define JSON_OBJECT_SIZE(NUMBER_OF_ELEMENTS)        \
+  (sizeof(ArduinoJson::Internals::JsonObjectData) + \
+   (NUMBER_OF_ELEMENTS) *                           \
+       sizeof(ArduinoJson::Internals::JsonObjectData::node_type))
+
+namespace ArduinoJson {
+namespace Internals {
+struct JsonObjectData : List<JsonPair>, JsonBufferAllocated {
+  explicit JsonObjectData(JsonBuffer* buf) throw() : List<JsonPair>(buf) {}
+};
+}  // namespace Internals
+}  // namespace ArduinoJson