One of the core design points of Pystd has been that it maintains perfect API and ABI stability while also making it possible to improve the code in arbitrary ways. To see how that can be achieved, let's look at what creating a new "year epoch" looks like. It's quite simple. First you run this script
Then you add the new files to Meson build targets (I was too lazy to implement that in the script). Done. For extra points there is also a new test that mixes types of pystd2025 and pystd2026 just to verify that things work.
As everything is inside a yearly namespace (and macros have the corresponding prefix) the symbols do not clash with each other.
At this point in time pystd2025 is frozen so old apps (of which there are, to be honest, approximately zero) keep working forever. It won't get any new features, only bug fixes. Pystd2026, on the other hand, is free to make any changes it pleases as it has zero backwards compatibility guarantees.
Isn't code duplication terribly slow and inefficient?
It can be. Rather than handwaving about it, lets measure. I used my desktop computer which has an AMD Ryzen 7 3700X.
Compiling Pystd from scratch and running the test suite (with code for both 2025 and 2026) in both debug and optimized modes takes 3 seconds in total (1s for debug, 2s for optimized). This amounts to 2*13 compiler invocations, 2 static linker invocations and 2*5 dynamic linker invocations.
Compiling a helloworld with standard C++ using -O2 -g also takes 3 seconds. This amounts to a single compiler invocation.
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