In what cases is it necessary to synchronize access to instance members? I understand that access to static members of a class always needs to be synchronized- because they are shared across all object instances of the class. My question is when would I be incorrect if I do not synchronize instance members? for example if my class is...
I'm in the process of creating a double-linked list, and have overloaded the operator= to make on list equal another: template<class T> void operator=(const list<T>& lst) { clear(); copy(lst); return; } but I get this error when I try to compile: container_def.h(74) : error C2801: 'operator =' must be a non-static member ...
Currently I have a web service (WCF) that exposes methods that are set to static. From a strictly memory/GC perspective, what is different in how the CLR and GC handle static versus non-static objects? ...
Hi, I'll first tell you what I am trying to do, and then how I am trying to do it. If there is a better way please let me know. I am working with two forms - lets call them form_main and form_preferences When the form_preferences form is up, I want form_main to be disabled until a button (save button) on the form_preferences is clicke...
Possible Duplicate: Static vs. non-static method which one is better for a good design or are there any difference? or is it just up to the developer? class Foo { int x; void add(Foo* f1) //Method 1 { x += f1->x; } static void add(Foo* f1, Foo* 2) //Method 2 { f1->x = f1->x + f2->x; ...
I've encountered a very strange problem. My program looks like this: class Outter{ class Inner extends Thread { public void run(){ // do something } } public void func() { new Inner().start(); // Thread.sleep() for a while to see if the above thread has fin...
hi, I have a weird issue using polymorphism. I have a base class that implements a static method. This method must be static for various reasons. The base class also has a pure virtual method run() that gets implemented by all the extended classes. I need to be able to call run() from the static class. The problem, of course, is that th...
i am reading records data from a file(records count can be up to thousands ).Now i want to insert each record in to database.I want to insert all of records in one hit to reduce performance hit. If i use addBatch(String sqlQuery ) on statment object,my sql query should be static .but in my case query will be non static.Please tell me pos...
I am writing a class library(API) in C#. The class is non-static and contains several public events. Is it possible to trigger those events from a static method in a separate class? For example... class nonStaticDLLCLASS { public event Event1; public CallStaticMethod() { StaticTestClass.GoStaticMethod(); } } class Stati...
Hi, I'm getting an error when I try to call a non-static method in a static class. "Cannot make a static reference to the non-static method methodName() from the type playback" I can't make the method static as this gives me an error too. "This static method cannot hide the instance method from xInterface" Is there any way to get ro...
I'm refactoring a large amount of code where I have to add an extra parameter to a number of functions, which will always have a value of a member of that object. Something like class MyClass { public: CMyObject A,B; void MyFunc(CMyObject &Object); // used to be void MyFunc(); }; Now, I'd actually like it to read class MyC...
This is probably a dumb question but I'm going to ask it anyways... I am programing in C#.NET. I have a class that contains a non-static, instance EventHandler. Is it possible to trigger that EventHandler for every instance of the class that exists from a static method?? I know this is a long shot! ...
Ok, so I'm working on a project for a class I'm taking.. simple music library. Now I'm having some issues, the main issue is I'm getting "non-static method cannot be referenced from a static context" Here is a function I have public void addSong() { Scanner scan = new Scanner(System.in); Song temp = new Song(); int index ...
I ask that you ignore all logic.. i was taught poorly at first and so i still dont understand everything about static crap and its killing me. My error is with every single variable that i declare then try to use later inside my methods... i get the non-static variable cannot~~ error I can simply put all the rough coding of my methods ...
$ javac TestFilter.java TestFilter.java:19: non-static variable this cannot be referenced from a static context for(File f : file.listFiles(this.filterFiles)){ ^ 1 error $ sed -i 's@this@TestFilter@g' TestFilter.java $ javac TestFilter.java $ java TestFilter file1 file2 file3 TestFilter.ja...
I have a class containing, among other things, a drop down menu. With the aim of saving space, and since the contents of the menu will never change, I've made a static DataProvider for the whole class that populates each instances menu. I was hoping to populate the list with actual functions like so: tmpArr.push({label:"Details...", fu...
public class Function { public static void main(String args[]) { System.out.println(power(3,2)); System.out.println(power(3,2)); System.out.println(power(2)); } public long power(int m) { return m*m; } public long power(int m,int n) { long product=1; for(int i=1;i<=n;i++) ...
This is driving me nuts. I have a working text based application. It has many many variables which now need a GUI. I'm starting with the basics. Whenever some data is sent to my log, I want it to display in my textbox. Here is a unified entry point for data to pass where it can be manipulated. public class Log { private static...