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%Information to be included in the title page:
\title{The Two Interfaces in OOP}
\subtitle{}
\author{Damien Cassou, Stéphane Ducasse and Luc Fabresse}
\institute{http://stephane.ducasse.free.fr}
\date{}
\slidesid{}

\begin{document}

\frame[plain]{\titlepage}



\begin{frame}[fragile]

\frametitle{Outline}

\begin{itemize}
\item Some questions
\item Two different clients
\end{itemize}
\end{frame}



\begin{frame}[fragile]

\frametitle{What are the Consequences of}

\begin{listing}{}
A 
{ private x ;
void foo(){ ... x ...}
}
\end{listing}
\end{frame}



\begin{frame}[fragile]

\frametitle{Consequences}

\begin{itemize}
\item cannot access x from
\item cannot replace x
\item cannot extend!
\end{itemize}

Cannot even copy and paste foo()\{ ...\} in subclasses!
\end{frame}



\begin{frame}[fragile]

\frametitle{Clients?}

What are the clients of a class?

\begin{itemize}
\item Its users (e.g., Person is client of Address)
\item but also its subclasse
\end{itemize}
\end{frame}



\begin{frame}[fragile]

\frametitle{What do you think about this}

Some tutorials mention: Fields should be private 
\end{frame}



\begin{frame}[fragile]

\frametitle{The correct idiom is...}

\begin{itemize}
\item Fields should be private AND class should provide protected accessors
\item OR
\item Fields should be protected
\end{itemize}
\end{frame}



\begin{frame}[fragile]

\frametitle{Benefits}

\begin{itemize}
\item Your clients cannot access your fields
\item And your subclasses are empowered
\begin{itemize}
\item A subclass can extend/refine the behavior of the superclass
\end{itemize}

\end{itemize}


\begin{center}
\includegraphics[width=0.6\textwidth]{figures/DualInterfaces2.png}\end{center}

\end{frame}



\begin{frame}[fragile]

\frametitle{Conclusion}

A class has always two clients:

\begin{itemize}
\item its users 
\item its extenders
\end{itemize}
\end{frame}




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\setbeamertemplate{background canvas}{\insertBorderForHandout}

\begin{frame}[plain]

\begin{minipage}{\originaltextwidth}
\centering
\large


\vspace{2em}

A course by

\vspace{1em}

\hspace{-20px}\includegraphics[height=32px]{inriaLogo}\hspace{3em}\raisebox{7px}{and}\hspace{3em}\raisebox{-6px}{\includegraphics[height=30px]{logoutop}}

\vspace{2em}

in collaboration with

\vspace{1em}

\includegraphics[height=40px]{unisciellogo}\hskip 1.5em%
\raisebox{5px}{\includegraphics[height=30px]{unitlogo}}\hskip 2em%
\raisebox{8px}{\includegraphics[height=24px]{univLilleLogo}}\hskip 2em%
\raisebox{3px}{\includegraphics[height=29px]{logo-IMT}}\hskip 2em%
\raisebox{1px}{\includegraphics[height=32px]{minesDouaiLogo}}

\vspace{2.5em}

\includegraphics[width=50px]{by-nc-nd} \tiny \hskip 0.5em \raisebox{5px}{Inria 2016}

\medskip

\tiny
Except where otherwise noted, this work is licensed under CC BY-NC-ND 3.0 France

\url{https://creativecommons.org/licenses/by-nc-nd/3.0/fr/} 

\end{minipage}
\end{frame}

\end{document}

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