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I m sure that all of these rules about when you can and can t call an operator overload method seem very confusing and overly complicated . If compilers that supported operator overloading just didn t emit the specialname metadata flag, the rules would be a lot simpler, and programmers would have an easier time working with types that offer operator overload methods . Languages that support operator overloading would support the operator symbol syntax, and all languages would support calling the various op_ methods explicitly . I can t come up with any reason why Microsoft made this so difficult, and I hope that they ll loosen these rules in future versions of their compilers . For a type that defines operator overload methods, Microsoft recommends that the type also define friendlier public static methods that call the operator overload methods internally . For example, a public-friendly named method called Add should be defined by a type that overloads the op_Addition method . The third column in Tables 8-1 and 8-2 lists the recommended friendly name for each operator . So the Complex type shown earlier should be defined this way:

public sealed class OSHandle { // This field holds the Win32 handle of the unmanaged resource. private IntPtr handle; // This constructor initializes the handle. public OSHandle(IntPtr handle) { this.handle = handle; } // When garbage collected, the destructor (Finalize) method, which // will close the unmanaged resource s handle, is called. ~OSHandle() { CloseHandle(handle); } // Public method returns the value of the wrapped handle public IntPtr ToHandle() { return handle; } // Public implicit cast operator returns the value of the wrapped handle public static implicit operator IntPtr(OSHandle osHandle) { return osHandle.ToHandle(); } // Private method called to free the unmanaged resource [System.Runtime.InteropServices.DllImport("Kernel32")] private extern static Boolean CloseHandle(IntPtr handle); }

When I execute this line, I get the following output:

The following configuration file demonstrates the use of probing:

Using tables is problematic. It requires a great deal of code (especially if spacer images are used) and it is confusing to read. It is also difficult for search engines to understand, and that makes it less likely that your site will be found by people using the search engines. Furthermore, changes to the layout require a significant amount of code revision. Creating three columns using a style sheet, however, requires simple CSS code, like this:

The Handles keyword connects the subroutine with the fired event. The decoded message comes into the handler through the decodedMessage argument, and is splashed all over the screen with a simple yet powerful call to the MsgBox function. That s it for the sample code. Now it s time to roll up your sleeves and embark on a full Visual Basic 2008 project.

Null Value Display................................................................................................................................. 109 The Nature of Null Values ..................................................................................................................... 109 The IS NULL Operator ........................................................................................................................... 111 Null Values and the Equality Operator .................................................................................................. 112 Null Value Pitfalls.................................................................................................................................. 113

Just as it was important to know a set s universe U, it s important to know a relation s universe it s part of what de nes the relation. The symbol < can appear between numbers or strings in SQL, but the relation < between numbers is not the same thing as the relation < between strings. If you aren t careful, as the following T-SQL example shows, you can run into trouble or at least what looks like trouble:

Notice that the previous code iterates over an array of System.Type objects . The System.Type type is your starting point for doing type and object manipulations . System.Type is an abstract base type derived from System.Reflection.MemberInfo (because a Type can be a member of another type) . The FCL provides a few types that are derived from System.Type:System.RuntimeType, System.ReflectionOnlyType, System.Reflection.TypeDelegator, and some types defined in the System.Reflection. Emit namespace (EnumBuilder, GenericTypeParameterBuilder, and TypeBuilder) .

Use several different estimation techniques, and compare the results The list of estimation approaches at the beginning of the section identified several techniques. They won t all produce the same results, so try several of them. Study the different results from the different approaches.