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Open / closed principle.

In object-oriented programming, the 'open/closed principle' states 'software entities' (classes, modules, methods, etc.) should be open for extension, but closed for modification.

1 comment:

  1. it's little different from design by contract... more general, without the need to use 'precondition', 'postcondition' and 'invariant'.

    perhaps there are subtler differences as well.