Why are module implementation and signatures separated in OCaml? (2018)
Separation of module implementation and signatures in OCaml enables scalable builds, creation of cmi files, and streamlined interface modifications. Emphasizing abstraction and implementation separation enhances modular programming and system reasoning.
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Separation of module implementation and signatures in OCaml allows for separate compilation, enabling builds to scale despite software size and complexity. The compiler can create cmi files from ml files directly, facilitating compilation against interfaces without needing implementations until link time. This approach streamlines the modification of stable interfaces without recompiling dependent modules. While some debate the necessity of mli files for separate compilation, they play a crucial role in maintaining stable interfaces and enabling performance optimizations. The ML module system emphasizes the separation between abstraction and implementation, enhancing modular programming and system reasoning. While the use of mli files for signatures is a design choice, they offer a structured approach to documenting interfaces and implementations separately. Overall, the modular system in OCaml aims to protect abstractions, reduce complexity, and support the evolution of projects over time.
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