STL analogue in Fortran

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There are no templates in Fortran and hence no STL. You can try FLIBS for some generic libraries. It generally uses transfer() tricks to achieve generic programming.

There is a preprocessor which adds some templates to Fortran and comes with some small STL, you can try that too named PyF95++. If you have access to academic papers through some library, you can read about it here.

I would avoid mixing it with C++ in this specific case although it can be done. You must instantiate each case separately and interface it to Fortran using a wrapper (bind(C) and iso_c_binding). Only if you have a very limited number of types you want to use the algorithms for it could be worth it.

You can also try to implement some poor-man’s templates using the C-preprocessors in Fortran, For smaller libraries it works, but can become too difficult to maintain or ugly for complex things. As an example you can see my implementation of a linked list https://github.com/LadaF/fortran-list .

Generally, there is no clearly right approach or answer, you always have to choose from more possibilities.

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