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diff --git a/include/lib/ArduinoJson/Data/JsonVariantContent.hpp b/include/lib/ArduinoJson/Data/JsonVariantContent.hpp
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+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#pragma once
+
+#include "JsonFloat.hpp"
+#include "JsonInteger.hpp"
+
+namespace ArduinoJson {
+
+// Forward declarations
+class JsonArray;
+class JsonObject;
+
+namespace Internals {
+// A union that defines the actual content of a JsonVariant.
+// The enum JsonVariantType determines which member is in use.
+union JsonVariantContent {
+ JsonFloat asFloat; // used for double and float
+ JsonUInt asInteger; // used for bool, char, short, int and longs
+ const char* asString; // asString can be null
+ JsonArray* asArray; // asArray cannot be null
+ JsonObject* asObject; // asObject cannot be null
+};
+}
+}