C++11: override keyword

Source : http://en.cppreference.com/w/cpp/language/override

src/lib_json/json_reader.cpp

@@ -1903,9 +1903,9 @@ public:
   : collectComments_(collectComments)
   , reader_(features)
   {}
-  virtual bool parse(
+  bool parse(
       char const* beginDoc, char const* endDoc,
-      Value* root, std::string* errs) {
+      Value* root, std::string* errs) override {
     bool ok = reader_.parse(beginDoc, endDoc, *root, collectComments_);
     if (errs) {
       *errs = reader_.getFormattedErrorMessages();