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\title{Document}
\author{
  Elvis Rossi
}
\date{\today}

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\begin{document}

\section{Implementation Design}
\subsection{Design Choices}
The class \texttt{Stencil} holds both the parallel implementation using the FastFlow library and using the native C++ threads.  The one using C++ threads can be called with the method \texttt{stdthread}.  The operator \texttt{()} instead will use the FastFlow library.  The class can also be used as a node; an example is given in the file ``main.cpp'', where using the function \texttt{fastflow} creates a pipe between the reader, the stencil and the writer.

\begin{figure}[H]
  \centering
  \includegraphics[width=0.4\textwidth]{pipeline.eps}
  \caption{}
\end{figure}

The class \texttt{Reader} reads a binary file composed of 4 bytes representing the number of rows, 4 bytes representing the number of columns and then the raw matrix data. The result is stored in the class \texttt{Task} which will be passed to the next node in the FastFlow implementation. If instead the operator \texttt{()} is called, the resulting task will be returned via the promise given as input.



\end{document}

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