Implementing coroutines using C++17
summary
An actual C++17 coroutine implementation appears, about 200 lines of code with accompanying test cases, and it literally smashes the return address on MSVC x64 using a tiny assembly shim to implement resume. Pause and resume work by storing and restoring the return address via a noinline helper and builtin return address, with an extra asm clobber to force reload of registers. Frame storage uses recursive struct inheritance to compute sizes, macros to declare frames, and explicit cleanup functions for proper destruction — and it runs.
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