Gradual Migration Rather Than Rewriting

Continuing from my last post, I've been daydreaming about migrating existing software from C/C++ to something safer. Importantly, I want to avoid ab-initio rewrites and gradually migrate an existing codebase.

I learned that Modula-2 (and Object Pascal) require manual memory management, so won't satisfy my requirements. D is the next oldest language, and it has had some recent improvements:

• There is a "betterC" mode where the compiled code doesn't need any runtime support, suitable for linking into a majority-C program. At the cost of a lot of advanced features, but this doesn't matter for porting C code.
• This can be used to port software, one function at a time, from C. Tests run after each change to prevent regressions.
• Once this has finished, you could switch betterC mode off again and use D-specific features like OO and GC.

Converting C to D

I did try to get something similar for Go to work, but failed. And even though it's impressive, I think Rust's semantics are so different that a rewrite would be required.

c2go

So I've been learning D (or at least the subset needed to do the above). Looks straightforward so far, at least compared to Rust. Although I prefer ISLisp, sometimes you just need to bang bits ...

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