Tamas Rudnai wrote:

>>> Pascal has a good approach with the Units, that include together the
>>> code and the prototypes for everything.
>> 
>> A problem with this approach may be that you have to distribute source
>> code for every library you sell.
> 
> No, you don't. You do not have to give away the implementation section,
> only the interface one. Take a look at this example from the freePascal
> documentation (it contains both sections but once you compiled your unit
> you can cut off the implementation...):

[snipped code]

Ok, but how is this different from the C-style header and implementation
file process? Looks to me like it's pretty much the same.

Gerhard

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