Web Reference: A foreign function interface (FFI) is a mechanism by which a program written in one programming language can call interoperable routines or make use of services written or compiled in another one. Most foreign code exposes a C ABI, and Rust uses the platform’s C calling convention by default when calling foreign functions. Some foreign functions, most notably the Windows API, use other calling conventions. Mixing different programming languages has long been something I don't quite understand. According to this Wikipedia article, a foreign function interface (or FFI) can be done in several ways:
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