Added operators == and != for MemberProxy

CHANGELOG.md

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

src/ArduinoJson/Object/MemberProxy.hpp

@@ -49,6 +49,14 @@ class MemberProxy : public VariantOperators<MemberProxy<TObject, TStringRef> >,
     return *this;
   }
 
+  FORCE_INLINE bool operator==(VariantConstRef rhs) const {
+    return static_cast<VariantConstRef>(getUpstreamMember()) == rhs;
+  }
+
+  FORCE_INLINE bool operator!=(VariantConstRef rhs) const {
+    return static_cast<VariantConstRef>(getUpstreamMember()) != rhs;
+  }
+
   FORCE_INLINE void clear() const {
     getUpstreamMember().clear();
   }

test/MemberProxy/CMakeLists.txt

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

test/MemberProxy/compare.cpp

@@ -0,0 +1,26 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2019
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+using namespace ARDUINOJSON_NAMESPACE;
+
+TEST_CASE("MemberProxy::operator==()") {
+  DynamicJsonDocument doc(4096);
+
+  SECTION("same values") {
+    doc["key1"] = "value";
+    doc["key2"] = "value";
+    REQUIRE(doc["key1"] == doc["key2"]);
+    REQUIRE_FALSE(doc["key1"] != doc["key2"]);
+  }
+
+  SECTION("different values") {
+    doc["key1"] = "value1";
+    doc["key2"] = "value2";
+    REQUIRE_FALSE(doc["key1"] == doc["key2"]);
+    REQUIRE(doc["key1"] != doc["key2"]);
+  }
+}