Allow nested Computation Expression for writing Builder Like DSLs

[baronfel]

Allow nested Computation Expression for writing Builder Like DSLs [7199500]

Submitted by Robert Kuzelj on 3/12/2015 12:00:00 AM
5 votes on UserVoice prior to migration

type DirectionBuilder() =
member self.Yield(()) = []
[<CustomOperation("left")>]
member self.Left (acc, degree) = somefn degree
[<CustomOperation("right")>]
member self.Right (acc, degree) = somefn degree
[<CustomOperation("velocity")>]
member self.Velocity (acc, ()) = new VelocityBuilder()
and VelocityBuilder() =
member self.Yield(()) = []
[<CustomOperation("accelerate")>]
member self.Accesslarate (acc, v) = somefn v
[<CustomOperation("decelerate")>]
member self.Decelerate (acc, v) = somefn v
let direction () = new DirectionBuilder()
direction() {
right 90
left 30
velocity() {
accelerate 1
}
}

Response

** by fslang-admin on 7/18/2015 12:00:00 AM **

Many thanks for this suggestion. It is being marked as declined – for discussion see the comments.
Further discussion welcome
Don Syme, F# Language and Core Library Evolution.

Original UserVoice Submission
Archived Uservoice Comments