Mail Archives: djgpp/1999/01/21/00:07:32
From: | Shue-Cheng CHEN <scchen AT ohriki DOT t DOT u-tokyo DOT ac DOT jp>
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Newsgroups: | comp.lang.c++,comp.os.msdos.djgpp
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Subject: | How to implement "They are all Vectors, but different realities?"
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Date: | 21 Jan 1999 02:05:28 GMT
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Organization: | Dept of Civil Engineering, the University of Tokyo
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Lines: | 29
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Message-ID: | <36A68B87.FFBA110C@ohriki.t.u-tokyo.ac.jp>
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NNTP-Posting-Host: | chen.ohriki.t.u-tokyo.ac.jp
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Mime-Version: | 1.0
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To: | djgpp AT delorie DOT com
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DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
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Reply-To: | djgpp AT delorie DOT com
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Hi!
We know "Force" and "Velocity" are both "Vectors" in mathematics, so
I defined them to own all behaviors and data of Vector (has been defined),
without duplicating the code, as follows,
class Force : public Vector {...};
class Velocity : public Vector {...};
Therefore, the operators of Vector, for example, operator+(Vector&, Vector&)
can be used for Force and Velocity, like
Force + Force // Ok
Velocity + Velocity // Ok
But "Force" and "Velocity" are different physical realities, so
Force + Velocity // Wrong
I would like to deploit the common implementation of them to avoid
duplicating their code, but how should I do to prevent from Force +
Vector meaningless operation?
Thanks a lot!
Best Regards,
Shue-Cheng CHEN
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