How can I implement the same behavior as Dictionary.TryGetValue
- by pblasucci
So, given then following code
type MyClass () =
let items = Dictionary<string,int>()
do
items.Add ("one",1)
items.Add ("two",2)
items.Add ("three",3)
member this.TryGetValue (key,value) =
items.TrygetValue (key,value)
let c = MyClass ()
let d = Dictionary<string,int> ()
d.Add ("one",1)
d.Add ("two",2)
d.Add ("three",3)
And the following test code
let r1,v1 = d.TryGetValue "one"
let r2,v2 = c.TryGetValue "one"
The r1,v1 line works fine. The r2,v2 line bombs; complaining c.TryGetValue must be given a tuple. Interestingly, in each line the signature of TryGetValue is different. How can I get my custom implementation to exhibit the same behavior as the BCL version? Or, asked another way, since F# has (implicitly) the concept of tuple parameters, curried parameters, and BCL parameters, and I know how to distinguish between curried and tuple-style, how can I force the third style (a la BCL methods)?
Let me know if this is unclear.
