added a slide talking about GPU/CPU function forwarding

Documentation/FinalPresentation/Presentation.tex

@@ -4,6 +4,7 @@
 \usepackage{graphicx}
 \usepackage[font={footnotesize}]{caption}
 \usepackage{textcomp}
+\usepackage{listings}
 \newcommand{\textapprox}{\raisebox{0.5ex}{\texttildelow}}
 \setcounter{tocdepth}{2}
 \setbeamertemplate{navigation symbols}{}
@@ -112,6 +113,29 @@ \subsection{Easily Enable/Disable GPU Acceleration}
 \end{itemize}
 \end{frame}
 
+\defverbatim[colored]\lstI{
+\begin{lstlisting}[language=C++,basicstyle=\ttfamily,keywordstyle=\color{red}]
+  inline G4double GetY(G4double x)
+  {
+    #if GEANT4_ENABLE_CUDA
+      return cudaVector->GetXsec(x);
+    #else
+      return GetXsec(x);
+    #endif
+  }
+\end{lstlisting}
+}
+
+
+\begin{frame}
+\frametitle{Implementation}
+\begin{itemize}
+\item Header forwards function calls to GPU or CPU Implementation
+\item This decision is made at compile time. 
+\end{itemize}
+\lstI
+\end{frame}
+
 \begin{frame}
 \frametitle{Accelerating Module on GPU}
 \begin{itemize}