Added operators == and != for MemberProxy

CHANGELOG.md

@@ -4,7 +4,7 @@ ArduinoJson: change log
 HEAD
 ----
 
-* Added operators `==` and `!=` for `JsonDocument` and `MemberProxy`
+* Added operators `==` and `!=` for `JsonDocument`, `ElementProxy`, and `MemberProxy`
 
 v6.11.2 (2019-07-08)
 -------

src/ArduinoJson/Array/ElementProxy.hpp

@@ -47,6 +47,14 @@ class ElementProxy : public VariantOperators<ElementProxy<TArray> >,
     return *this;
   }
 
+  FORCE_INLINE bool operator==(VariantConstRef rhs) const {
+    return static_cast<VariantConstRef>(getUpstreamElement()) == rhs;
+  }
+
+  FORCE_INLINE bool operator!=(VariantConstRef rhs) const {
+    return static_cast<VariantConstRef>(getUpstreamElement()) != rhs;
+  }
+
   FORCE_INLINE void clear() const {
     getUpstreamElement().clear();
   }

test/ElementProxy/CMakeLists.txt

@@ -5,6 +5,7 @@
 add_executable(ElementProxyTests
 	add.cpp
 	clear.cpp
+	compare.cpp
 	remove.cpp
 	set.cpp
 	size.cpp

test/ElementProxy/compare.cpp

@@ -0,0 +1,28 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2019
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+using namespace ARDUINOJSON_NAMESPACE;
+
+TEST_CASE("ElementProxy::operator==()") {
+  DynamicJsonDocument doc(4096);
+
+  SECTION("same value") {
+    doc.add(1);
+    doc.add(1);
+
+    REQUIRE(doc[0] == doc[1]);
+    REQUIRE_FALSE(doc[0] != doc[1]);
+  }
+
+  SECTION("different values") {
+    doc.add(1);
+    doc.add(2);
+
+    REQUIRE_FALSE(doc[0] == doc[1]);
+    REQUIRE(doc[0] != doc[1]);
+  }
+}