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> Set.ofList ["b";"a";"b";"b";"c" ];; val it : Set<string> = seq [ "a"; "b"; "c" ] > Set.toList (Set.ofList ["abc"; "ABC"]);; val it : string list = [ "ABC"; "abc" ] Here you can see several things: F# Interactive prints the contents of structured values such as lists and sets. Duplicate elements are removed by the conversion. The elements in the set are ordered. The default ordering on strings used by sets is case sensitive.

Members referenced by prefixing a type name are called static members, and members associated with a particular value of a type are called instance members; in other words, instance members are accessed through an object on the left of the dot We discuss the distinction between values, properties, and methods later in this chapter, and we discuss members in full in 6 Sometimes explicitly named functions play the role of members For example, we could have written the earlier code as follows:.

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Furthermore, and perhaps most importantly, the pluggable storage engine can be used to connect data that is not normally connected to database systems That is, you can create storage engines to read streaming data (eg, RSS) or other nontraditional, nondisk stored data Whatever your needs, MySQL can meet them by allowing you to create your own storage engines that will enable you to create an efficient specialize relational database system for your environment You can use the MySQL server as your relational database processing engine and wire it directly to your legacy data by providing a special storage engine that plugs directly into the server This may not sound like an easy thing to do, but it really is The most important architectural element is the use of an array of single objects to access the storage engines (one object per storage engine).

The following attributes control the comparison and equality semantics of type definitions: StructuralEquality and StructuralComparison: Indicate that a structural type must support equality and comparison

So far you ve developed graphical applications based on the composition of predeveloped graphical controls, but what do you do if no graphical control suits your needs You need to learn how to draw using the drawing primitives provided by the graphical system. To understand how drawing works, you need to review the model lying behind the rendering process of a graphical application. You know already that the event-driven programming paradigm is the one that best suits graphical applications; so far you have associated event handlers with user actions, but events are used by the graphical system as a general mechanism to communicate with the graphical application. An application uses resources provided by the graphical system, and these resources are mostly windows. A window is simply a rectangular area on the screen, not necessarily a toplevel window with buttons, a title bar, and all the amenities you usually associate with it. Windows can be nested and are the unit of traditional windowing systems. Windows can contain other windows, and the windowing system is responsible for ensuring that events are routed to the callbacks registered for handling the events for each window.

The control of these single objects is in the form of a complex structure called a handlerton (as in singleton see the sidebar on singletons) A special class called a handler is a base class that uses the handlerton to complete the interface and provide the basic connectivity to enable a storage engine All storage engines are derived from the base handler class, which acts as a police officer marshaling the common access methods and function calls to the storage engine and from the storage engine to the server In other words, the handler and handlerton structure act as an intermediary (or black box) between the storage engine and the server As long as your storage engine conforms to the handler interface, you can plug it in to the server All of the connection, authentication, parsing, and optimization is still performed by the server in the usual way.

NoComparison and NoEquality: Indicate that a type doesn t support equality or comparison CustomEquality and CustomComparison: Indicate that a structural type supports custom equality and comparison

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