Member Availability
| Has member? | Handler for missing member | |||
|---|---|---|---|---|
| Method | Field | Method | Field | |
| ABAP Objects | ||||
| C++ (STL) | ||||
| Objective-C (Cocoa) | forwardInvocation: | |||
| Smalltalk | x respondsTo: selector | doesNotUnderstand: | ||
| C# | (using reflection) | |||
| Java | ||||
| D | opDispatch | |||
| Eiffel | ||||
| Python | hasattr(x, "method") and callable(x.method) | hasattr(x, "field") | __getattr__ | |
| Visual Basic .NET | (using reflection) | |||
| Windows PowerShell | (using reflection) | |||
| F# | (using reflection) | |||
| Ruby | x.respond_to?(:method) | method_missing | ||
| PHP | method_exists(x, "method") | property_exists(x, "field") | __call | __get / __set |
| Perl | x->can("method") | exists x->{field} | AUTOLOAD | |
| Perl 6 | x.can("method") | x.field.defined | AUTOLOAD | |
| OCaml | ||||
| JavaScript | typeof x.method === "function" | field in x | ||
Read more about this topic: Comparison Of Programming Languages (object-oriented Programming)
Famous quotes containing the words member and/or availability:
“Every member of the family of the future will be a producer of some kind and in some degree. The only one who will have the right of exemption will be the mother ...”
—Ruth C. D. Havens, U.S. suffragist. As quoted in History of Woman Suffrage, vol. 4, ch. 13, by Susan B. Anthony and Ida Husted Harper (1902)
“Since ... six weeks ago, there has been no day in which I have not had letters and visits on the subject of my nomination for the Presidency.... I say very little. I have in no instance encouraged any one to work to that end.... I have said the whole talk about me is on the score of availability. Let availability do the work then.”
—Rutherford Birchard Hayes (1822–1893)