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:
“Neighboring farmers and visitors at White Sulphur drove out occasionally to watch ‘those funny Scotchmen’ with amused superiority; when one member imported clubs from Scotland, they were held for three weeks by customs officials who could not believe that any game could be played with ‘such elongated blackjacks or implements of murder.’”
—For the State of West Virginia, U.S. public relief program (1935-1943)
“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)