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Windows are allowed to draw in their own client area, and the drawing is performed through the device context, an object provided by the graphical system and used to perform the graphic primitives to draw the content The graphic primitives issued to the graphics system are not retained by it; therefore, when the window is covered for some reason, the portion that becomes hidden must be repainted once uncovered Since the information required to redraw the hidden portion is held by the application owning the window, the graphical system sends a paint message to the window To better understand the drawing model, consider a simple graphical application that shows how to draw a curved line using the B zier curve and canonical splines, given four control points.

The different storage engines merely pass the data to and from the server in a common format, translating it to and from the specialized storage medium MySQL AB has documented the process of creating a new storage engine fairly well As of this writing, 16 of the MySQL reference manual contains a complete explanation of the storage engine and all of the functions supported and required by the handler interface I recommend reading the MySQL reference manual after you have read this chapter and worked through building the example storage engine The MySQL reference manual in this case is best used as just that a reference..

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Let s look at examples of these. Sometimes you may want to assert that a structural type must support structural equality, and you want an error at the definition of the type if it doesn t. You do this by adding the StructuralEquality or StructuralComparison attribute to the type: [<StructuralEquality;StructuralComparison>] type MiniIntegerContainer = MiniIntegerContainer of int This adds extra checking. In the following example, the code gives an error at compile time the type can t logically support automatic structural comparison because one of the element types doesn t support ordered comparison: [<StructuralEquality;StructuralComparison>] type MyData = MyData of int * string * string * System.Windows.Forms.Form error FS1177: The struct, record or union type 'MyData' has the 'StructuralComparison' attribute but the component type 'System.Windows.Forms.Form' does not satisfy the 'comparison' constraint

Start by opening your namespaces and telling Windows Forms that your form can use the XP/Vista look rather than the classic Windows 95 style; also set a global flag to inform standard controls to use the new GDI+ text-rendering primitives rather than those of the traditional GDI (we ll omit this code from now on, but remember to use it later and that these must be before windows are created; otherwise, an exception is thrown): open System open SystemDrawing open SystemWindowsForms ApplicationEnableVisualStyles() ApplicationSetCompatibleTextRenderingDefault(false) You next create the form and define the initial values of the control points.

Many types in the .NET libraries come with custom equality, hashing and comparison implementations. For example, System.DateTime has custom implementations of these. F# also allows you to define custom equality, hashing, and comparison for new type definitions. For example, values of a type may carry a unique integer tag that can be used for this purpose. In such cases, we recommend that you take full control of your destiny and define custom comparison and equality operations on your type. For example, Listing 8-1 shows how to customize equality, hashing and comparison based on a unique stamp integer value. The type definition includes an implementation of System.IComparable and overrides of Object.Equals and Object.GetHashCode. Listing 8-1. Customizing Equality, Hashing, and Comparison for a Record Type Definition /// A type abbreviation indicating we're using integers for unique stamps /// on objects type stamp = int /// A structural type containing a function that can't be compared for equality [<CustomEquality; CustomComparison>] type MyThing = { Stamp: stamp; Behaviour: (int -> int) } override x.Equals(yobj) = match yobj with | : MyThing as y -> (x.Stamp = y.Stamp) | _ -> false

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