Fixed dangling reference in MemberProxy and ElementProxy (fixes #1120)

src/ArduinoJson/Array/ArrayImpl.hpp

@@ -19,4 +19,10 @@ inline ObjectRef ArrayShortcuts<TArray>::createNestedObject() const {
   return impl()->addElement().template to<ObjectRef>();
 }
 
+template <typename TArray>
+inline ElementProxy<TArray> ArrayShortcuts<TArray>::operator[](
+    size_t index) const {
+  return ElementProxy<TArray>(*impl(), index);
+}
+
 }  // namespace ARDUINOJSON_NAMESPACE

src/ArduinoJson/Array/ArrayShortcuts.hpp

@@ -16,7 +16,7 @@ template <typename TArray>
 class ArrayShortcuts {
  public:
   // Returns the element at specified index if the variant is an array.
-  FORCE_INLINE ElementProxy<const TArray &> operator[](size_t index) const;
+  FORCE_INLINE ElementProxy<TArray> operator[](size_t index) const;
 
   FORCE_INLINE ObjectRef createNestedObject() const;
 

src/ArduinoJson/Array/ElementProxy.hpp

@@ -161,12 +161,6 @@ class ElementProxy : public VariantOperators<ElementProxy<TArray> >,
   const size_t _index;
 };
 
-template <typename TArray>
-inline ElementProxy<const TArray&> ArrayShortcuts<TArray>::operator[](
-    size_t index) const {
-  return ElementProxy<const TArray&>(*impl(), index);
-}
-
 }  // namespace ARDUINOJSON_NAMESPACE
 
 #ifdef _MSC_VER