self

问题 This question is in relation to posts at What does 'super' do in Python? , How do I initialize the base (super) class? , and Python: How do I make a subclass from a superclass? which describes two ways to initialize a SuperClass from within a SubClass as class SuperClass: def __init__(self): return def superMethod(self): return ## One version of Initiation class SubClass(SuperClass): def __init__(self): SuperClass.__init__(self) def subMethod(self): return or class SuperClass: def __init__

问题 This question is in relation to posts at What does 'super' do in Python? , How do I initialize the base (super) class? , and Python: How do I make a subclass from a superclass? which describes two ways to initialize a SuperClass from within a SubClass as class SuperClass: def __init__(self): return def superMethod(self): return ## One version of Initiation class SubClass(SuperClass): def __init__(self): SuperClass.__init__(self) def subMethod(self): return or class SuperClass: def __init__

问题 I'm doing the following Ruby Tutorial http://rubymonk.com/learning/books/4-ruby-primer-ascent/chapters/48-advanced-modules/lessons/118-wrapping-up-modules One of the exercises asks me to ...define a static method square in the module Math. It should obviously return the square of the number passed to it... Why does it only work when I prefix the method definition with "self"? E.g. the following works: module Math def self.square(x) x ** 2 end end But the following does NOT work: module Math

问题 I'm doing the following Ruby Tutorial http://rubymonk.com/learning/books/4-ruby-primer-ascent/chapters/48-advanced-modules/lessons/118-wrapping-up-modules One of the exercises asks me to ...define a static method square in the module Math. It should obviously return the square of the number passed to it... Why does it only work when I prefix the method definition with "self"? E.g. the following works: module Math def self.square(x) x ** 2 end end But the following does NOT work: module Math

问题 I am new to Objective C.I am trying aout some example programs.I could not understand how the self and super methods work in objective C. In the pgm below CashTransaction.m [super trackSpending:amount] is called and in CreditCardTransaction.m [self trackSpending:amount] is called.I could not find difference between the self and super.super is for invoking the base class overriden method.and self is for invoking the child class overridden method.This is what my understanding is.please correct

问题 Can anyone explain the difference between setting someObject = someOtherObject; and self.someObject = someOtherObject; if someObject is a class property created with @property (nonatomic, retain) SomeType someObject; To clarify I have something like: @interface SomeClass : NSObject { SomeType* someObject; } @property (nonatomic, retain) SomeType* someObject; @end I have noticed I get EXC_BAD ACCESS sometimes when I use the property without self and it seems quite random. When I use self my

问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: Objective-C - When to use ‘self’ I can't understand very well the importance and the usage of the "self" keyword in objective-c. It's my first OOP language so i got stuck on some concepts. When i should use "self"? Why is it useful? Thanks for the answers! Edit: I can't understand why is this a duplicated post of Objective-C - When to use 'self' when there there is not the explanation of "Self" that i wanted.

问题 I'm having a really hard time understanding the intersection of OO Perl and my $self = shift; The documentation on these individual elements is great, but none of them that I've found touch on how they work together. I've been using Moose to make modules with attributes, and of course, it's useful to reference a module's attribute within said module. I've been told over and over again to use my $self = shift; within a subroutine to assign the module's attributes to that variable. This makes

问题 This isn't for anything I'm working on yet, it's just some test code as I'm just learning class methods and suck. But say I have the following code class Test(int): def __init__(self,arg): self = arg def thing(self): self += 10 and going, foo=Test(12) sets foo to 12. However I want it, so when I do, foo.thing(), foo increases by 10. So far, going foo.thing() just keeps it at 12. How would I change this code to do that. 回答1: Because int is a immutable, you cannot magically turn it into a

问题 This question already has answers here : Ruby Definition of Self (3 answers) Closed 3 years ago . What does ruby self represent? what is it? what does it mean? Could some please explain it to me? in simple terms please And what is its function in a class? class MyClass def method.self end end 回答1: self refers to the object that is currently in context. In your example, self is the class itself and def self.method is defining a class method. For example: class MyClass def self.method puts