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@ -12135,6 +12135,7 @@ In the rare cases where the slicing was deliberate the code can be surprising.
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Circle c2 {{1,1}, 43};
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assign( c, c2); // oops, not the whole state is transferred
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assert( c == c2); // if we supply copying, we should also provide comparison,
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// but this will likely return false
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The result will be meaningless because the center and radius will not be copied from `c` into `s`.
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The first defense against this is to [define the base class `Shape` not to allow this](#Rc-copy-virtual).
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