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What do “covariance” and “contravariance” mean, and does Ada support either or both?

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What do “covariance” and “contravariance” mean, and does Ada support either or both?

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(From Robert Martin) [This is C++ stuff, it must be completely re-written for Ada.

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(From Robert Martin) [This is C++ stuff, it should be completely re-written for Ada.

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