instance-methods

When sending mail in Rails, usually one would do something like this: UserMailer.password_reset(user).deliver But if we look inside UserMailer we can see this: def password_reset(user) # not self.password_reset # ... end Notice that the method name is not prefixed with self . Looking at it, it seems like you need to instantiate the object first as below. How does Rails do this? UserMailer.new.password_reset(user).deliver That's a great question. In the source ( https://github.com/rails/rails/blob/master/actionmailer/lib/action_mailer/base.rb ), Rails uses method_missing to create a new

I would like to know if I could force this to happen class A def bomb ; "bomb" ; end end class B ; end bomb = A.instance_method(:bomb) b = B.new bomb.bind(b) currently it throws the error TypeError: bind argument must be an instance of A I find this very limiting concerning what I can do with these unbound methods, the possibilities are a bit limiting. In cases like these (and I'm not referring only to idempotent functions) it would make sense right? And an execution error would have sufficed, In case I would be handling variables from A which are not replicated in B. I'd really like to know

This question already has an answer here: Static Classes In Java 14 answers So, in short. I have two classes. package rpg; public class Engine { public void main(String args[]) { Start.gameStart(); System.out.println(menuResult); } } and package rpg; public class Start { int menuResult = 3; public int gameStart() { return menuResult; } public int getMenuResult() { return Start.menuResult; } } It keeps throwing up the error 'Cannot make static reference to non-static method gameStart()'. I'm sure I'm missing something simple, but can't find it. Thanks! You need to create instance of Start class

While I understand the $this variable is not available when a method is called in a static context, to assist in decoupling my application components from one-another I figured it would make sense to call static methods from an instance. For example: class MyExample{ private static $_data = array(); public static function setData($key, $value){ self::$_data[$key] = $value; } // other non-static methods, using self::$_data } // to decouple, another class or something has been passed an instance of MyExample // rather than calling MyExample::setData() explicitly // however, this data is now

Let's say I have this program: class Foo { public: unsigned int bar () { static unsigned int counter = 0; return counter++; } }; int main () { Foo a; Foo b; } (Of course this example makes no sense since I'd obviously declare "counter" as a private attribute, but it's just to illustrate the problem). I'd like to know how C++ behaves in this kind of situation: will the variable "counter" in the bar() method be the same for every instance? Yes, counter will be shared across all instances of objects of type Foo in your executable. As long as you're in a singlethreaded environment, it'll work as

I'd like to be able to do this: class A(object): @staticandinstancemethod def B(self=None, x, y): print self is None and "static" or "instance" A.B(1,2) A().B(1,2) This seems like a problem that should have a simple solution, but I can't think of or find one. It is possible, but please don't. I couldn't help but implement it though: class staticandinstancemethod(object): def __init__(self, f): self.f = f def __get__(self, obj, klass=None): def newfunc(*args, **kw): return self.f(obj, *args, **kw) return newfunc ...and its use: >>> class A(object): ... @staticandinstancemethod ... def B(self, x