Common mistakes. If left to type inference, op operates on values of the same type as init which can result in unwanted casting of the iterator elements. For example, std::accumulate(v.begin(), v.end(), 0) likely does not give the result one wishes for when v is std::vector<double>.Subclasses of Monoid with a solid theoretical foundation and practical purposes. GCDMonoid is a subclass of ReductiveMonoid that provides the gcd operation for getting the greatest common denominator for two given monoid values.
First, you must create a request handler class by subclassing the BaseRequestHandler class and overriding its handle() method; this method will process incoming requests. Second, you must instantiate one of the server classes, passing it the server's address and the request handler class.