Cpp Coding Standards/ENC/Internal

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Giving out handles to your class internals is just another way to make internals public, and makes keeping class invariants hard to impossible (see ENC:PrivData).

Exception: Sometimes member data of a class are just aggregated to it, but the state of this one member is not part of the class's invariants. In such case a get-/set-access to this data may be okay.

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