By M. Schilli
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Additional info for Perl Power - A JumpStart Guide to Pgmg. With Perl 5
Example text
NET Runtime world, internal equates to allowing access to all classes that are in the same assembly as this class. In the C++ world, such accessibility is usually granted by the use of friends, Note which provide access to a specific class. Friend provides greater granularity in specifying who can access a class, but in practice, the access provided by internal is usually sufficient. In general, all classes should be internal unless users should be able to access them. Using internal on Members The internal modifier can also be used on a member, which then allows that member to be accessible from classes in the same assembly as itself, but not from classes outside the assembly.
If there’s a good predefined exception in the System namespace that describes the exception condition—one that will make sense to the users of the class—use that one rather than defining a new exception class, and put specific information in the message. If the user might want to differentiate one case from others where that same exception might occur, then that would be a good place for a new exception class. Finally, if code catches an exception that it isn’t going to handle, consider whether it should wrap that exception with additional information before rethrowing it.
A C# program calling this function will see the parameters as out parameters, but other languages will see them as ref parameters. Overloading Sometimes it may be useful to have two functions that do the same thing but take different parameters. This is especially common for constructors, when there may be several ways to create a new instance. y; } int x; int y; } class Test { public static void Main() { Point myPoint = new Point(10, 15); Point mySecondPoint = new Point(myPoint); } } The class has two constructors; one that can be called with x and y values, and one that can be called with another point.