Overloading monadic operators?
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// Implementations | |
module Reader = | |
let bind (f: 'e -> 't, binder: 't -> 'e -> 'u) : 'e -> 'u = | |
fun e -> | |
binder (f e) e | |
// Specializations | |
type Bind = | |
| Bind with | |
static member (>>=) (Bind, m: 'e -> 't) = | |
fun (f: 't -> 'e -> 'u) -> | |
Reader.bind (m, f) | |
static member (>>=) (Bind, m: Async<'t>) = | |
fun (f: 't -> Async<'u>) -> | |
async.Bind (m, f) | |
// Generalizations | |
module Monad = | |
let inline bind m f = | |
(Bind >>= m) f | |
// Operators | |
let inline (>>=) m f = | |
Monad.bind m f | |
// Test | |
[<EntryPoint>] | |
let main _ = | |
// Async | |
let asyncm = async.Return 9 | |
let asyncf = fun i -> async.Return (i % 2 = 0) | |
let asyncx = (asyncm >>= asyncf) |> Async.RunSynchronously | |
// Reader | |
let readerm = fun e -> List.head e | |
let readerf = fun i e -> (i + List.sum e) = 5 | |
let readerx = (readerm >>= readerf) [ 2; 3 ] | |
0 |
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