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In F# there are two ways you can define parameters for functions and members of classes: the curried style where members can be partially applied and the tuple style where all members must be given at once. When defining classes, your C# clients will find it easier to use your classes if you use the tuple style. Consider the following example in which you define a class in F#. Here one member has been defined in the curried style, called CurriedStyle, and the other has been defined in the tuple style, called TupleStyle. namespace Strangelights type DemoClass(z: int) = // method in the curried style member this.CurriedStyle x y = x + y + z // method in the tuple style member this.TupleStyle (x, y) = x + y + z When viewed from C#, the member CurriedStyle has the following signature: public FastFunc<int, int> CurriedStyle(int x) whereas the TupleStyle will have the following signature: public int TupleStyle(int x, int y); If you want to use both methods from C#, you would end up with code that looks like the following: // !!! C# Source !!! using System; using Strangelights; using Microsoft.FSharp.Core; class Program { static void UseDemoClass() { DemoClass c = new DemoClass(3); FastFunc<int, int> ff = c.CurriedStyle(4); int result = ff.Invoke(5); Console.WriteLine("Curried Style Result {0}", result); result = c.TupleStyle(4, 5); Console.WriteLine("Tuple Style Result {0}", result); } static void Main(string[] args) { UseDemoClass(); } }

If you ever have trouble getting a joystick to work in a game, test it with Listing 6-8 (see Figure 6-4). You will easily be able to tell if a button or control isn t working properly.

private void RemoveUser() { try { OdbcConnection dataConnection = new OdbcConnection(); dataConnection.ConnectionString = DataUtilities.ConnectionString; dataConnection.Open(); OdbcCommand dataCommand = new OdbcCommand(); dataCommand.Connection = dataConnection; // Build command string StringBuilder commandText = new StringBuilder("DELETE FROM Users WHERE UserName = '"); commandText.Append(userName); commandText.Append("'"); dataCommand.CommandText = commandText.ToString(); int rows = dataCommand.ExecuteNonQuery(); // Make sure that the DELETE worked Assert.AreEqual(1, rows, "Unexpected Users row count "); dataConnection.Close(); } catch(Exception e) { Assert.fail("Users database error: " + e.Message); } } private void CreateCustomer() { try { OdbcConnection dataConnection = new OdbcConnection(); dataConnection.ConnectionString = DataUtilities.ConnectionString; dataConnection.Open(); OdbcCommand dataCommand = new OdbcCommand(); dataCommand.Connection = dataConnection; // Build command string StringBuilder commandText = new StringBuilder("INSERT INTO Customers (");

It is clear from this sample that users of your library will be much happier if you use the tuple style for the public members of your classes Specifying abstract members in interfaces and classes is slightly more complicated because you have a few more options The following example demonstrates this: namespace Strangelights type IDemoInterface = // method in the curried style abstract CurriedStyle: int -> int -> int // method in the tupled style abstract TupleStyle: (int * int) -> int // method in the C# style abstract CSharpStyle: int * int -> int // method in the C# style with named arguments abstract CSharpNamedStyle: x : int * y : int -> int Note that the only difference between OneArgStyle and MultiArgStyle is that the latter is not surrounded by parentheses.

Figure 6-4. The joystick demo script in action Listing 6-8. Joystick Demo (joystickdemo.py) import pygame from pygame.locals import * from sys import exit pygame.init() screen = pygame.display.set_mode((640, 480), 0, 32) # Get a list of joystick objects joysticks = [] for joystick_no in xrange(pygame.joystick.get_count()): stick = pygame.joystick.Joystick(joystick_no) stick.init() joysticks.append(stick) if not joysticks: print "Sorry! No joystick(s) to test." exit() active_joystick = 0

This small difference in the F# definition has a big effect on the signature as seen from C# With the former, you see the following signature: int OneArgStyle(Tuple<int, int>); whereas the latter is seen as the following signature: int MultiArgStyle(int, int); The latter is a good bit friendlier for the C# user However, you can take it a bit further and add names to each of your parameters This won t change the signature the C# user will use when implementing the method, but it will change the names they see when using Visual Studio tools to implement the interface Furthermore, some other NET languages treat argument names as significant This may sound like a small difference, but it will make implementing your interface a lot easier, because the implementer will have a much better idea of what the parameters of the method actually mean.