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a comment base on my experiences #7

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a comment base on my experiences #7

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19 changes: 18 additions & 1 deletion 2021/barely-interface.md
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Expand Up @@ -232,7 +232,24 @@ If anything, keeping things simple is often a good policy. If you start off wit

## Discussion

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@icing: the dimension in code most overlooked is time. the interface/baseclass will need to evolve in ways
inforeseen today. If it is 'private', not visible outside your module/package, you retain every freedom to
modify both in any way.

If your interface/baseclass is visible to the outside, the interface is orders of magnitude less dangerous
to change than the 'abstract' base class. Especially when the abstract baseclass has any 'default' implementation
of a method (the 'code reuse' pit). These default implementation parts are never documented, and yet are part
of the contract to any inheritor of the base class.

The most brittle is the initialisation phase. When the constructors run top to bottom, it is often assumed
that all methods function that are part of the interface. Most implementation inheritancers become very surprised
when their class methods get called before the constructor has run.

Lots of pitfalls in your own code, but when the hierarchy is split among release lines, the behaviour
of the "other side" can change any time and break you. Not worth it.


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