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Now that we've considered the consequences of using an output buffer,
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we're almost ready to design our derived class. Several more features
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it() First, we should allow the user of the class to specify the size of
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it() Second, it should be possible to construct an object of our class
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before the file descriptor is actually known. Later, in section ref(FORK)
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To save some space in the annotations(), the successful completion of the
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functions designed here is not checked in the example code. In `real life'