| Abstract Base Classes |
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| • | The
purpose of declaring a function to be |
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| pure
is to force the derived classes to |
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| implement
it. |
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| • | A
virtual function is a contract with a |
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| derived
class indicating the name, signature, |
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| and
return type for the function. |
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| • | Making
the virtual function pure forces the |
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| contract
to be fulfilled. |
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