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| 245 | 245 |  \begin{block}{Principle} | 
| 246 | 246 |  \begin{itemize} | 
| 247 | 247 |  \item when overriding a virtual method, the \cppinline|override| keyword should be used | 
| 248 |  | - \item the \cppinline|virtual| keyword is then optional | 
|  | 248 | + \item the \cppinline|virtual| keyword is then optional in derived classes | 
| 249 | 249 |  \end{itemize} | 
| 250 | 250 |  \end{block} | 
| 251 | 251 |  \begin{exampleblock}{Practically} | 
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| 275 | 275 |  \end{block} | 
| 276 | 276 |  \begin{itemize} | 
| 277 | 277 |  \item with \cppinline|override|, you would get a compiler error | 
| 278 |  | - \item if you forget \cppinline|override| when you should have it, you get a compiler warning | 
|  | 278 | + \item if you forget \cppinline|override| when you should have it, you may get a compiler warning | 
| 279 | 279 |  \end{itemize} | 
| 280 | 280 | \end{frame} | 
| 281 | 281 | 
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