overriding

I have created a class that extends Array. I want to execute arbitrary code before calling the inherited push function. class newArray extends Array{ //execute any logic require before pushing value onto array this.push(value) } Udesh The solution I found was to create a new function in the subclass that has the same name as the inherited function. In this case push. Then inside the overriding function the inherited function is called via the super keyword. class newArray extends Array{ push(value) { //execute any logic require before pushing value onto array console.log(`pushed ${value} on to

Let's suppose I have class User : public class User { private Long id; private String name; private Integer age; private BigDecimal account; // other fields, getters and setters } Is it proper to override the equals method as follows? @Override public boolean equals(Object ob) { if (ob == null) { return false; } if (this == ob) { return true; } if (ob instanceof User) { User other = (User) ob; return this.id.equals(other.getId()); } return false; } It turns out that the uniqueness of an object is determined only by its ID. But in my application, id is always unique. It's provided at the

I want to build a rails app with two different protect_from_forgery strategies: one for the web application, and one for the API. In my application controller I have this line of code: protect_from_forgery with: :exception in order to prevent CSRF attacks, it works just fine. In my API namespace, I created an api_controller that inherits from my application controller, and that is the parent class of all the other controllers in the API namespace, and I changed the code above with: protect_from_forgery with: :null_session . Sadly, I have an error when trying to make POST request: "Can't verify

I would like to overload only one type of subsref calls (the '()' type) for a particular class and leave any other calls to Matlab's built in subsref -- specifically, I want Matlab to handle property/method access via the '.' type. But, it seems like Matlab's 'builtin' function doesn't work when subsref is overloaded in a class. Consider this class: classdef TestBuiltIn properties testprop = 'This is the built in method'; end methods function v = subsref(this, s) disp('This is the overloaded method'); end end end To use the overloaded subsref method, I do this: t = TestBuiltIn; t.testprop >>

I found one source which successfully overrode Time.strftime like this: class Time alias :old_strftime :strftime def strftime #do something old_strftime end end The trouble is, strftime is an instance method. I need to override Time.now - a class method - in such away that any caller gets my new method, while the new method still calls the original .now method. I've looked at alias_method and have met with no success. This is kinda hard to get your head around sometimes, but you need to open the "eigenclass" which is the singleton associated with a specific class object. the syntax for this is

I am new to C++. Could anybody tell me the difference between method overriding and virtual function concepts in c++. The functionality of virtual functions can be over-ridden in its derived classes. Redefining a function in a derived class is called function overriding. why do we actually have virtual functions? pyon ABSTRACT In this paper, we discuss virtual functions in C++. Part zero explains how virtual functions are declared and overridden. Part one attempts (and perhaps fails) to explain how virtual functions are implemented. Part two is a sample program that uses the example classes

Here is a simple code in C++: #include <iostream> #include <typeinfo> template<typename T> void function() { std::cout << typeid(T).name() << std::endl; } int main() { function<int>(); function<double>(); return 0; } I have read that templates in C++ is a compile-time feature, which is not like generics in C#/Java. So as I understood, the C++ compiler will divide a single defined function into various number (depends on calls count with different type) of functions. Am I right or not? I'm not an expert in C++ compilers, so I'm asking a piece of advice from you. If my suggestion about compiler

I have a few months of experience developing Extjs web application. I ran into this problem: When I override a class, I modified the method and followed the previous implementation and invoke callParent() . The overriding part works but the callParent() invoked the old implementation. my overriding code Ext.override(Ext.layout.component.Draw, { finishedLayout: function (ownerContext) { console.log("new layouter being overriden"); this.callParent(arguments); } }); The Extjs class method to be overridden: finishedLayout: function (ownerContext) { var props = ownerContext.props, paddingInfo =

Possible Duplicate: When do you use Java's @Override annotation and why? I wonder what the functionality of adding @Override in front of the code we would like to override is. I have done with and without it, and it seemed that everything was just going well (at least, for me). It is not necessary , but it is highly recommended. It keeps you from shooting yourself in the foot. It helps prevent the case when you write a function that you think overrides another one but you misspelled something and you get completely unexpected behavior. what the functionality of adding @Override It lets the