step4.tex

% $Id: step4.tex 4605 2014-01-30 08:49:42Z kanschat $

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\section[Step4]{Step 4: Dimension independent programming}
\frame{\tableofcontents[currentsection,hideothersubsections]}

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\begin{frame}
  \frametitle{Tutorial step 4}
  {\footnotesize{\url{http://www.dealii.org/\dealrelease/doxygen/deal.II/step_4.html}}}
  \begin{itemize}
  \item Dimension independent programming
  \end{itemize}
\end{frame}

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\subsection{Dimension templates}
\begin{frame}[fragile]
  \frametitle{Dimension templates}
  \begin{itemize}
  \item Most of deal.II classes come in the form
    \begin{block}{}
\begin{lstlisting}
template <int dim> class ClassName;
\end{lstlisting}      
    \end{block}
  \item We have used them so far as
    \begin{block}{}
\begin{lstlisting}
Triangulation<2>
DoFHandler<2>
\end{lstlisting}      
    \end{block}
  \item Now we make our own class a dimension template
  \end{itemize}
\end{frame}

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\begin{frame}[fragile]
  \frametitle{Writing a dimension template}
  \begin{itemize}
  \item Make the class a template
    \begin{block}{}
      \only<1>{\lstinline!class LaplaceProblem \{\};!}
      \only<2->{\lstinline!template <int dim> class LaplaceProblem \{\};!}      
    \end{block}
  \item<3-> Replace all instantiations with dimension 2 by
    \lstinline!dim!.
    \begin{block}{}      
      \only<3>{\lstinputlisting{tutcode/step4-1.cc}}
      \only<4->{\lstinputlisting{tutcode/step4-2.cc}}
    \end{block}
  \item<5-> Make sure you never use concrete numbers
    \begin{block}{}
      \only<5>{\lstinputlisting{tutcode/step4-3.cc}}
      \only<6->{\lstinputlisting{tutcode/step4-4.cc}}      
    \end{block}
  \end{itemize}
\end{frame}

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\begin{frame}[fragile]
  \frametitle{Using the dimension template}
  \begin{block}{}
    \lstinputlisting{tutcode/step4-5.cc}    
  \end{block}
\end{frame}

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