Andrzej Krzemienski wrote:
Please correct me if I am wrong, but my understanding is that Boost.ASIO works under C++03, and so does Boost.Coroutine. Whereas Boost.Coroutine2 requires C++11. If Boost.ASIO were to switch from BoostCoroutine to Boost.Coroutine2, it would break its C++03 guarantee. (Some teams in my work still have to use C++03.)
It's a bit more complex than that. Boost.Coroutine depends on Boost.Context, which is C++11. However, in order to not break C++03, Coroutine doesn't use the public API of Context, but the private "fcontext" parts that are kept C++03 compatible only because of that. This incidentally means that if you compile Context with the `ucontext` backend instead of the `fcontext` one, Coroutine breaks. So it's basically a mess and needs to be cleaned up. Since asio::spawn is a separate part of Asio, moving just it to C++11 wouldn't be as disruptive a change as requiring C++11 for all of Asio.