Redesigned JsonVariant to leverage converting constructors instead of assignment operators

include/ArduinoJson/JsonArraySubscript.hpp

@@ -0,0 +1,40 @@
+// Copyright Benoit Blanchon 2014-2015
+// MIT License
+//
+// Arduino JSON library
+// https://github.com/bblanchon/ArduinoJson
+
+#pragma once
+
+#include "JsonVariantBase.hpp"
+
+namespace ArduinoJson {
+class JsonArraySubscript : public JsonVariantBase<JsonArraySubscript> {
+ public:
+  JSON_FORCE_INLINE JsonArraySubscript(JsonArray& array, size_t index)
+      : _array(array), _index(index) {}
+
+  JSON_FORCE_INLINE JsonArraySubscript& operator=(const JsonVariant& value) {
+    _array.set(_index, value);
+    return *this;
+  }
+
+  JSON_FORCE_INLINE bool success() const { return _index < _array.size(); }
+
+  JSON_FORCE_INLINE operator JsonVariant() const { return _array.get(_index); }
+
+  template <typename T>
+  JSON_FORCE_INLINE T as() const {
+    return _array.get<T>(_index);
+  }
+
+  template <typename T>
+  JSON_FORCE_INLINE T is() const {
+    return _array.is<T>(_index);
+  }
+
+ private:
+  JsonArray& _array;
+  const size_t _index;
+};
+}