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From: John Maddock (john_at_[hidden])
Date: 2004-07-28 05:16:14

> Most of boost is implemented in header files (as most is based on
> templates). However, what are the guidelines for splitting code into
> compilable units?
> For example, if a library is not a template library, should the author
> strive to implement it entirely in headers as inline functions, or
> should it be implemented as part inline functions and part a compiled
> library?
> A fair amount of code uses the PIMPL pattern to reduce header
> complexity, reduce interface and implementation exposure, and to reduce
> compile times. However, this requires, in large part, separate compiled
> libraries.
> What is the Boost position in this regard?

Do what works best for the particular library: for example the filesystem
lib uses separate source in order to hide platform dependencies, and that's
a good thing. On the other hand we normally try not to gratuitously provide
separate source if it could all be implemented as trivial inlines. There is
also some guidance at


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