Eric Fiselier f9bc058935 Allow coroutine_handle<const T> to support creation from const references to the promise_type ...

It seems conceivable that a user would need to get a coroutine handle
having only a const reference to the promise_type, for example from
within a const member function of the promise.

This patch allows that use case. A coroutine_handle<const T> can be used
in essentially the same way a coroutine_handle<T>, ie to start and destroy
the coroutine. The constness of the promise doesn't/shouldn't propagate
to the handle.

llvm-svn: 305536

2017-06-16 00:36:17 +00:00

8.8 KiB

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