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Virtual Function Tables
A virtual function table is an array of pointers to the methods an object
supports. If you're using C, an object appears as a structure whose first member is
a pointer to the virtual function table (lpVtbl); that is, the first member points to an array containing function pointers.
The methods all take a pointer to the function table as the first parameter.
Thus, the following example calls the Read method of a pStream object:
pStream->lpVtbl->Read(pStream, parameters)
In C+ +, the pointer to the virtual function table, the this pointer, is implicit. The following is equivalent to the previous example
when using C+ +:
pStream->Read(parameters)
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