remove Json::Value::operator!()

operator! is no longer necessary because of explicit operator bool()

Author: btolfa

include/json/value.h

@@ -344,9 +344,6 @@ Json::Value obj_value(Json::objectValue); // {}
   /// otherwise, false.
   bool empty() const;
 
-  /// Return isNull()
-  bool operator!() const;
-
   /** \brief Return ! isNull();
    *
    * Example of usage:

src/lib_json/json_value.cpp

@@ -881,8 +881,6 @@ bool Value::empty() const {
     return false;
 }
 
-bool Value::operator!() const { return isNull(); }
-
 Value::operator bool() const { return ! isNull(); }
 
 void Value::clear() {