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When .NET was first designed, the .NET type system didn t include generics or a general notion of a function type as used by F#. Instead of functions, .NET uses delegates, which you can think of as named function types (that is, each kind of function type is given a different name). This means you often encounter delegate types when using .NET libraries from F#. Since .NET 2.0, some of these are even generic, giving an approximation to the simple and unified view of function types used by F#. Every .NET delegate type has a corresponding F# function type. For example, the F# function type for the .NET delegate type System.Windows.Forms.PaintEventHandler is obj -> System.Windows.Forms.PaintEventArgs -> unit. You can figure out this type by looking at the signature for the Invoke method of the given delegate type. .NET also comes with definitions for some generic delegate types. F# tends to use function types instead of these, so you don t see them often in your coding. However, Table 10-16 shows these delegate types just in case you meet them.

INSERT INTO characters (ID, LastName, FirstName, Gender) VALUES (3, 'Flintstone', 'Fred', 'M'); INSERT INTO characters (ID, LastName, FirstName, Gender) VALUES (5, 'Rubble', 'Barney', 'M'); INSERT INTO characters (ID, LastName, FirstName, Gender) VALUES (7, 'Flintstone', 'Wilma', 'F'); INSERT INTO characters (ID, LastName, FirstName, Gender) VALUES (9, 'Flintstone', 'Dino', 'M'); INSERT INTO characters (ID, LastName, FirstName, Gender) VALUES (4, 'Flintstone', 'Pebbles', 'F'); INSERT INTO characters (ID, LastName, FirstName, Gender) VALUES (1, 'Rubble', 'Betty', 'F'); INSERT INTO characters (ID, LastName, FirstName, Gender) VALUES (6, 'Rubble', 'Bam-Bam', 'M'); INSERT INTO characters (ID, LastName, FirstName, Gender) VALUES (8, 'Jetson', 'George', 'M'); # SELECT * FROM characters; # EXPLAIN (SELECT DISTINCT LASTNAME from characters); # SELECT DISTINCT LASTNAME from characters; # # Cleanup # DROP TABLE characters; # ..and we're done Notice that the contents of the test are simply SQL commands that create a table, insert some data, and then do a few simple selects.

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As it happens, you ve already met one important family of types whose implementations also vary from value to value: F# function types! In 3 you saw how functions can be used to model a range of concepts such as comparison functions, aggregation functions, and transformation functions In 5 you saw how records of function values can be used for the parameters needed to make an algorithm generic You ve also already met some other important object interface types such as System CollectionsGenericIEnumerable<'a> and SystemIDisposable Object interface types are always implemented, and the type definition itself doesn t specify how this is done Listing 6-5 shows an object interface type IShape and a number of implementations of it We now walk through the definitions in this code piece by piece, because they illustrate the key concepts behind object interface types and how they can be implemented.

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Most tests are a bit more complex than this, but you get the idea You create your test to exercise some set of commands (or data handling) Notice the first six lines The first three are comment lines and they begin with a # symbol You should always document your tests with a minimal explanation at the top of the file to indicate what the test is doing You should also use comments in the body of the test to explain any commands that aren t easily understood (eg, complex joins or user-defined functions) The fourth and sixth lines are interesting because they are issuing commands to the test suite Test suite commands always begin on a line with -- in front of them These lines are directing the test suite to temporarily disable and then enable any warning messages from the server.

Listing 6-5 An Object Interface Type IShape and Some Implementations open SystemDrawing type IShape = abstract Contains : Point -> bool abstract BoundingBox : Rectangle let circle(center:Point,radius:int) = { new IShape with member xContains(p:Point) = let dx = float32 (pX - centerX) let dy = float32 (pY - centerY) sqrt(dx*dx+dy*dy) <= float32 radius member xBoundingBox = Rectangle(centerX-radius,centerY-radius,2*radius+1,2*radius+1) } let square(center:Point,side:int) = { new IShape with member xContains(p:Point) = let dx = pX - centerX let dy = pY - centerY abs(dx) < side/2 && abs(dy) < side/2 member xBoundingBox = Rectangle(centerX-side,centerY-side,side*2,side*2) }.

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