Sebastian Fischer wrote:
Hello,
I wonder whether (and how) I should increase the version number of a
library when the API does not change but the implementation gets more
efficient.
I think it depends on how much more efficient. Constant factors of
improvement are always nice, but they aren't (usually) earth shattering
and so are probably only worth a D bump. Asymptotic improvements may
very well be worth a C or B bump--- especially if they introduce the
possibility of new bugs due to large code changes (i.e., you haven't
_proven_ bug-for-bug compatibility).
But it also depends on the audience. For example, some libraries are
defined as being "an efficient implementation of Foo" rather than being,
say, an implementation of a particular data type or a particular
high-level API for writing nice code. If your library is _defined_ by
its performance characteristics, then a C or B bump would be appropriate
since the complexity is effectively part of the API even though it isn't
captured in the type system.
--
Live well,
~wren
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