Added JsonVariant::clear()

src/ArduinoJson/Array/ElementProxy.hpp

@@ -47,6 +47,10 @@ class ElementProxy : public VariantOperators<ElementProxy<TArray> >,
     return *this;
   }
 
+  FORCE_INLINE void clear() const {
+    getUpstreamElement().clear();
+  }
+
   FORCE_INLINE bool isNull() const {
     return getUpstreamElement().isNull();
   }

src/ArduinoJson/Object/MemberProxy.hpp

@@ -49,6 +49,10 @@ class MemberProxy : public VariantOperators<MemberProxy<TObject, TStringRef> >,
     return *this;
   }
 
+  FORCE_INLINE void clear() const {
+    getUpstreamMember().clear();
+  }
+
   FORCE_INLINE bool isNull() const {
     return getUpstreamMember().isNull();
   }

src/ArduinoJson/Variant/VariantRef.hpp

@@ -136,6 +136,10 @@ class VariantRef : public VariantRefBase<VariantData>,
   // Creates an uninitialized VariantRef
   FORCE_INLINE VariantRef() : base_type(0), _pool(0) {}
 
+  FORCE_INLINE void clear() const {
+    return variantSetNull(_data);
+  }
+
   // set(bool value)
   FORCE_INLINE bool set(bool value) const {
     return variantSetBoolean(_data, value);