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Note particularly that upcasts aren t applied automatically for the result of a function. For example, an upcast is needed here, to coerce a StreamReader to a TextReader, despite the presence of an explicit type annotation for the return type: let getTextReader () : TextReader = (File.OpenText("input.txt") :> TextReader)

This is necessary in case the table (characters) does not already exist If I had left the warnings enabled, the test would have failed under this condition for one of two reasons: The server would have issued a warning The output would not match the expected results The general layout of your tests should include a cleanup section at the beginning to remove any tables or views that may exist as a result of a failed test The body of the test should include all the necessary statements to complete the test, and the end of the test should include cleanup statements to remove any tables or views you ve created in the test..

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type ITextOutputSink = abstract WriteChar : char -> unit abstract WriteString : string -> unit let simpleOutputSink(writeCharFunction) = { new ITextOutputSink with member x.WriteChar(c) = writeCharFunction(c) member x.WriteString(s) = s |> String.iter x.WriteChar } This construction function uses function values to build an object of a given shape. Here the inferred type is as follows:

F# also has the notion of a flexible type constraint, which is shorthand for a generic function and a constraint on the type variable. You could equally write this: > open System.Windows.Forms;; > let setTextOfControl (c : 'T when 'T :> Control) (s:string) = c.Text <- s;; val setTextOfControl: #Control -> string -> unit

Tip When writing your own tests, MySQL AB requests that you use table names such as t1, t2, t3, etc. and

In the following code, we instantiate the function parameter to output the characters to a particular System.Text.StringBuilder object, an imperative type for accumulating characters in a buffer before converting these to an immutable System.String value: open System.Text let stringBuilderOuputSink (buf : StringBuilder ) = simpleOutputSink (fun c -> buf.Append(c) |> ignore) Here is an example of the use of this function interactively: > let buf = new System.Text.StringBuilder();; val buf : StringBuilder > let c = stringBuilderOuputSink(buf);; val c : ITextOutputSink > ["Incy"; " "; "Wincy"; " "; "Spider"] |> List.iter c.WriteString;; val it : unit = () > buf.ToString();; val it : string = "Incy Wincy Spider" Object expressions must still give definitions for all unimplemented abstract members and cannot add other additional members; however, the abstract members can be implemented in terms of function parameters. As you saw in 3, function parameters can represent a wide range of concepts, so this technique is a powerful one. You can also use function parameters to qualify concrete types that implement object interface types. For example, here is a type CountingOutputSink that performs effectively the same role as the earlier function simpleOutputSink, except that the number of characters written to the sink is recorded and published as a property:

Automatic generalization lifts the constraints implicit in types of the form #type to the nearest enclosing function or member definition. Flexible type constraints sometimes occur when you re working with sequence values. For example, consider the following two functions from the F# library: module Seq = ... val concat : seq<#seq<'T>> -> seq<'T> ... When implicit flexibility or arguments is taken into account, the signature of concat means that Seq.concat accepts a list of lists, or a list of arrays, or an array of lists, and so forth. For example: Seq.concat [ [1;2;3]; [4;5;6] ] Seq.concat [ [| 1;2;3 |]; [| 4;5;6 |] ]

view names such as v1, v2, or v3, etc. so that your test tables do not conflict with any existing test tables.

type CountingOutputSink(writeCharFunction: char -> unit) = let mutable count = 0 interface ITextOutputSink with member x.WriteChar(c) = count <- count + 1; writeCharFunction(c) member x.WriteString(s) = s |> String.iter (x :> ITextOutputSink).WriteChar member x.Count = count

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