In some Languages you have Mixins which help you to devide problems into generic interfaces and their implementations. This allows easier code reuse and less complex code as a project evolves. I never found this functionality for C so thats what this library is trying to provide.
This is a very smal library. Just put hydrogen.h in your inclusion path. Than
add hydrogen.c to the compiled files.
By providing a generic interface mechanism this library tries to adress several goals:
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Improve code resuability.
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Reduce of code complexity.
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Simpler, smaller and less changing header files.
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More portable libraries.
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since it’s written in ANSI C you should be able to port it nearly everywhere.
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because the interfaces created with it can be very generic and isolated of the implementations you should be able to port denending libraries nearly everywhere.
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It introduces the struct h_vfs which serves as a generic class. Than it lets
you define interfaces as sets of functions that a class can implement. All
functions implementing such an interface get a first argument h_vfs *self.
Since all classes use the same type a class can implement an arbitrary number
of different interfaces without conflict.
Hydrogen is highly inspired by libdill where I first saw this technique (in fakt it is mostly extracted from there). However it serves a different purpose as its intended use is a general pupose c library for creating c interfaces and has no connection to concorrency or networking.