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This technique is very similar to the DependencyProperty concept used by WPF and WF.
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Vector3s, or Vector4s. For example, if you want to know which Vector2 is 70 percent between (5,8) and (2,9), you could use Vector2.Lerp(new Vector2(5,8), new Vector2(2,9), 0.7f).
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In this example, an instance of Bicycle is upcast to the object and then tested using the is operator. The results of the tests are written to the console. The is operator is used following an object reference and is itself followed by the type you want to test for. If the object is of the specified type or the specified type is a base class for the object, the is operator returns true; otherwise, it returns false. Compiling and running the code in Listing 6-24 produces the following results: Is Car False Is Bike True Is Object True Press enter to finish You can use the is operator to check an object s type before performing an explicit cast, like this: if (myObject is Bicycle) { Bicycle myBike = (Bicycle) myObject; } else if (myObject is Car) { Car myCar = (Car) myObject; }
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Table created. ops$tkyte@ORA11GR2> insert /*+ APPEND */ 2 select rownum, rownum, rownum 3 from all_objects 4 / 72089 rows created. ops$tkyte@ORA11GR2> commit; Commit complete. we then execute the same query against each type of column, using a complex mathematical function such as LN (natural log). We observe in a TKPROF report radically different CPU utilization: select sum(ln(num_type)) from t call count cpu elapsed ------- ------ -------- ---------total 4 4.45 4.66 select sum(ln(float_type)) from t call count ------- -----total 4 cpu elapsed -------- ---------0.07 0.08 into t
One primary use for the types in Csla.Core is to allow people to extend the framework. For instance, Core.BusinessBase could easily act as a starting point for creating some different or more advanced BusinessBase-style class. Likewise, Core.ReadOnlyBindingList is useful as a base for creating any type of read-only collection that supports data binding. There are also numerous interfaces in Csla.Core, which are very useful if you are building a UI framework that interacts with business objects. The base classes exposed by CSLA .NET are generic types, such as BusinessBase<T>. While generics are a powerful tool, they have a major drawback in that generic types are not polymorphic. For example, a List<string> and List<int> are two different types that do not inherit from List<T>. In fact, their common base type is IList, which is not a generic type. The same thing is true for BusinessBase<Customer> and BusinessBase<Product>. If you want to write code that can work with either type, you need to fall back to Csla.Core.BusinessBase, which is not a generic type. But if you want more focused behavior, such as the ability to save any editable object, you d want to use the Csla.Core.ISavable interface. That interface is implemented by both BusinessBase and BusinessListBase because both support editable objects that can be saved. Table 6-6 lists the most commonly used classes and interfaces in Csla.Core.
The concept of automatic disposal is also applied if you define managed classes with implicitly dereferenced member variables. The following code defines a managed class FileDumper with two fields of type FileStream and StreamReader: public ref class FileDumper { FileStream fs; StreamReader sr; public: FileDumper(String^ name) : fs(name, FileMode::Open), sr(%fs) {} void Dump() { Console::WriteLine(sr.ReadToEnd()); } }; For these fields, the compiler generates a constructor that ensures construction of the member variables and an IDisposable implementation that calls the destructors for the member variables. Both construction and destruction of the sub-objects is done in an exception-safe way. The following pseudocode describes what the compiler generates for the FileDumper constructor: FileDumper::FileDumper(String^ name) // pseudocode { // instantiate the first sub-object FileStream^ fs = gcnew FileStream(name, FileMode::Open); // if successful ... try { // ... assign tracking handle of new object to member variable this->fs = fs; // initialize second sub-object StreamReader^ sr = gcnew StreamReader(fs);
myStream.Seek(0, SeekOrigin.Begin);
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