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Further to my previous topic "My Thoughts on F#: Developments" I have now attempted of implementation of coroutines in F#, via System.Threading. Unfortunately it currently uses depreciated methods of System.Threading.Thread such as Suspend and Resume but compiles and initially seems to work, although extensive testing has not yet occured. Conceptually, we have
Here resume will raise a CoroutineFinishedException if the coroutine has finished and there is nothing else to return. An example of the use of this where 'b is unit, and hence the coroutine is one-way is given below:
In this example, count is a coroutine that yields values from 1 to 10. The main loop then just iterates through these printing them (see below for details on making this the same as the yield statement in C# via IEnumerable.)
Finally, implementation of the cocall and resume statements and details of the concrete type of coroutine are given below:
Full testing has yet to occur, but these implementations together with the definitions at the top of this page should allow two-way coroutine usage.
Note that this allows similar behaviour to the "yield" statement in C#. In fact, by making ('a, 'b) coroutine implement IEnumerable we can get exactly this behaviour - C#-style generators as a special case of these co-routines - when the co-routine is of type ('a, unit). This inspires the author to have a subtype of coroutine that in this case implements IEnumerable. In this case we have
and then the above code becomes
giving generators in F#.
This is implemented simply using the unfold function of the IEnumerable class as given below:
Finally, we have an example of a two-way coroutine setup:
from main: king
from ac: one
from main: of the doodah!
from ac: two
from main: quarkas
from ac: three
To do: introduction to coroutines for those who are unaware of them