February 2005
Beginner to intermediate
272 pages
4h 53m
English
Content preview from C++ Common Knowledge: Essential Intermediate Programming
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Item 63. Optional Keywords
Some keyword usage is strictly optional from the perspective of the C++ language, though other considerations may argue for their presence or absence.
The most common source of confusion is the optional use of virtual in a derived class member function that overrides a base class virtual member function.
The member function Blob::draw overrides the base class draw function and so is virtual; the use of the keyword is completely optional and has no effect on the meaning of the program. A common misassumption is that omitting the virtual keyword will prevent further overriding in more derived classes. This is not the ...
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