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:
“I cannot be indifferent to the assassination of a member of my profession, We should be obliged to shut up business if we, the Kings, were to consider the assassination of Kings as of no consequence at all.”
—Edward VII (1841–1910)
“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)