There is no way to automatically capture those variables, but you can use an alternative approach. This is if you want to capture by reference: int main() { int y = 100; // mark y as final if possible class IB : public IA { public: IB(int& y) : _y(y) {} int f(int x) { … Read more
public class Employee {}
Note that the wording in the JLS of that particular section has changed significantly since then. It now (JLS 11) reads: 15.9.5. Anonymous Class Declarations: An anonymous class is never final (§8.1.1.2). The fact that an anonymous class is not final is relevant in casting, in particular the narrowing reference conversion allowed for the cast … Read more
There is no equivalent syntax, as far as I know. Regarding equivalent techniques, theoretically you could use closures and define structs and classes inside them. Sadly, I can’t get this to work in a playground or project without making it crash. Most likely this isn’t ready to be used in the current beta. Something like… … Read more
You can use the type(name, bases, dict) builtin function to create classes on the fly. For example: op = type(“MyOptionParser”, (OptionParser,object), {“foo”: lambda self: “foo” }) op().foo() Since OptionParser isn’t a new-style class, you have to explicitly include object in the list of base classes.
Immediately instantiated anonymous class — is it a bad idea? Yes, a very bad one. Just as bad as new function() { … } was in ES5. This writing style leads to the creation of a new constructor function and prototype object every time the expression is evaluated. If you create multiple objects with this … Read more
One advantage of anonymous inner classes is that no one can ever use it anywhere else, whereas a named inner class can be used (if only by the class that created it if made private). It’s a small distinction, but it does mean that you can protect an inner class from being accidentally used elsewhere. … Read more
Java doesn’t know that doWork is going to be synchronous and that the stack frame that result is in will still be there. You need to alter something that isn’t in the stack. I think this would work final Long[] result = new Long[1]; and then result[0] = st.getLong(4); in execute(). At the end, you … Read more
You could serialize to an intermediate format, just to deserialize it right thereafter. It’s not the most elegant or efficient way, but it might get your job done: Suppose this is your class: // Typed definition class C { public string A; public int B; } And this is your anonymous instance: // Untyped instance … Read more
No. Anonymous types always implicitly derive from object, and never implement any interfaces. From section 7.6.10.6 of the C# 5 specificiation: An anonymous object initializer declares an anonymous type and returns an instance of that type. An anonymous type is a nameless class type that inherits directly from object. So if you want a different … Read more