class

问题 I am trying to declare a variable in a VB6 module as follows: Public WithEvents MyObject As MyClass The help files say that WithEvents can only be used in class modules. Why can't it be used in .bas modules? The legacy code I am working has an object declared globally in a module. I want to add WithEvents to this declaration but I need to keep the object global because many other forms etc refer to the object. How can I achieve this with minimal disruption to the code? 回答1: Write a class that

问题 I need to create a array that holds objects from multiple classes. Example class baseClass { // }; class first : baseClass { // }; class second : baseClass { // }; How do I create array that can hold first and/or second object inside it? It is somewhat of a home-task for me so I am forced to use arrays, I already searched and know that it is done with boost libraries ans such but I have no option here guys... 回答1: baseClass *array[10]; baseClass **array2 = new baseClass *[size]; This is the

问题 Let's start with another behavior: even if you declare a method/variable as private, another instance of the same class can access it. That's OK I can live with it. I call these class-private and not instance-private. Now the question part: For example, at runtime I want to be able to check that all String variables in this class are not null, and if they are null they should be changed to the string "NULL". I can run through the variables using reflection and get their values. But if I

问题 I am writing a program which will use Java reflection (i.e., Class.forName() ) to dynamically create class instance based on user's input. One requirement is that the instance my program creates must extend one specific Class I defined, called it SomeClass . My question is: for storing this class type, should I use bounded generic, Class<? extends SomeClass> , or simply unbounded generic, Class ? I found some Java books say that Class is one of the good practices for using unbounded wildcard

问题 I currently have a solution with multiple projects that mostly use the same classes. As a result, it appeared to me that it would be a good idea to add a class library containing these classes in the solution instead of repeating the class in each project. However, one project I have requires a few additional properties to some of the classes that are specific to that project and will not be used anywhere else. As a result, I thought that I should use partial classes to add these properties.

问题 This question already has answers here : Private properties in JavaScript ES6 classes (35 answers) Closed 3 years ago . In ES5, you could emulate a class with private and public variables like this: car.js function Car() { // using var causes speed to be only available inside Car (private) var speed = 10; // public variable - still accessible outside Car this.model = "Batmobile"; // public method this.init = function(){ } } But in ES6, you can no longer declare vars outside the constructor,

问题 Python provides us many possibilities on instance/class attribute, for example: class A(object): def __init__(self): self.foo = "hello" a = A() There are many ways to access/change the value of self.foo : direct access a.foo inner dict a.__dict__['foo'] get and set a.__get__ and a.__set__ ,of course there two are pre-defined methods. getattribute a.__getattribute__ __getattr__ and __setattr__ maybe more. While reading source code, I always get lost of what's their ultimate access order? When

问题 Alright, in my main i have: void somefunction(); int main() { //bla bla bla SomeClass myclass = SomeClass(); void(*pointerfunc)() = somefunction; myclass.addThingy(pointerfunc); //then later i do myclass.actionWithDiffrentOutcomes(); } void somefunction() { //some code } and in the class: class SomeClass() { public: void addThingy(void (*function)()); void actionWithDiffrentOutcomes(); private: std::vector<void (**)()> vectoroffunctions; } SomeClass::addThingy(void (*function)()) {

问题 So, I am a bit confused over this simple thing, i've googled as much as i could, but i just dont know the right keywords for googling it, i tried CSS selectors, etc, no answer was enough to clear my confusion. So i've also tested and p.classname doesn't even seem to work, but by definition in a book i'm reading ( updated 2012 ) To create a class in CSS and select an element in that class, you write a class selector, like this: p.classname{ stuff } So now you have a way of selecting elements

问题 I have a question about interface and class implementing interface. This is my code: interface iMyInterface { public iMethod1(); } public class cMyClass implements iMyInterface { public iMethod1() { // some code } protected iMethod2() { // some code } } I would like to create an instance of iMyInterface as this : iMyInterface i = new cMyClass(); i.iMethod1(); It's ok, but how can I call iMethod2() from my interface instance? Is this working and safe: ((cMyClass)i).iMethod2(); Thanks for help.