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  • What is the impact of Thread.Sleep(1) in C#?

    - by Justin Tanner
    In a windows form application what is the impact of calling Thread.Sleep(1) as illustrated in the following code: public Constructor() { Thread thread = new Thread(Task); thread.IsBackground = true; thread.Start(); } private void Task() { while (true) { // do something Thread.Sleep(1); } } Will this thread hog all of the available CPU? What profiling techniques can I use to measure this Thread's CPU usage ( other than task manager )?

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  • Use of @keyword in C# -- bad idea?

    - by Robert Fraser
    In my naming convention, I use _name for private member variables. I noticed that if I auto-generate a constructor with ReSharper, if the member is a keyword, it will generate an escaped keyword. For example: class IntrinsicFunctionCall { private Parameter[] _params; public IntrinsicFunctionCall(Parameter[] @params) { _params = @params; } } Is this generally considered bad practice or is it OK? It happens quite frequently with @params and @interface.

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  • Can a stack have an exception safe method for returning and removing the top element with move seman

    - by Motti
    In an answer to a question about std::stack::pop() I claimed that the reason pop does not return the value is for exception safety reason (what happens if the copy constructor throws). @Konrad commented that now with move semantics this is no longer relevant. Is this true? AFAIK, move constructors can throw, but perhaps with noexcept it can still be achieved. For bonus points what thread safety guarantees can this operation supply?

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  • Must Dependency Injection come at the expense of Encapsulation?

    - by urig
    If I understand correctly, the typical mechanism for Dependency Injection is to inject either through a class' constructor or through a public property (member) of the class. This exposes the dependency being injected and violates the OOP principle of encapsulation. Am I correct in identifying this tradeoff? How do you deal with this issue? Please also see my answer to my own question below.

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  • How come nobody wrote RadioMenuItems class for Winforms?

    - by Pavel Radzivilovsky
    Or maybe google is just not so friendly to me? What I want is this simple thing: constructor that accepts an array of menu item objects Value get/set property that would set all the Checked properties right bind to all Clicked events of the supplied items and provide One event Working DataBind facilities If you encountered such a nice thing around, please direct me. No need for manual do-it-in-your-form1.cs-class links, please. This I can do myself.

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  • how to use intent from receiver android

    - by ng93
    hi ive got a working sms receiver but when i try to load another class using: Intent intent = new Intent(SMSReceiver.this, SMSNotifier.class); startActivityForResult(intent, 0); i get the error: The constructor Intent(SMSReceiver, Class<SMSNotifier>) is undefined for the first line and: The method startActivityForResult(Intent, int) is undefined for the type SMSReceiver for the second line id really appreciate some advice as to whats going wrong thanks, ng93

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  • Debugging a GEF Eclipse plugin

    - by darkie15
    All, How can we debug a Eclipse plug-in based on GEF? Currently, I have a Activator class and custom editor from Example . Yet I am not able to find any output for the plugin. I tried using the "Launch Eclipse in Debug Mode" and setting a breakpoint in the Activator constructor method, but do not find any debugging activities taking place. Can anyone please guide on how to go about with debugging?

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  • Why static fields are not initialized in time?

    - by Tom Brito
    Somebody tell me: class MyClass { private static MyClass myClass = new MyClass(); private static final Object obj = new Object(); public MyClass() { System.out.println(obj); // will print null once } } I wonder, isn't this a bug? Why static objects are not initialized before the constructor runs?

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  • Using array as map value: Cant see the error

    - by Tom
    Hi all, Im trying to create a map, where the key is an int, and the value is an array int red[3] = {1,0,0}; int green[3] = {0,1,0}; int blue[3] = {0,0,1}; std::map<int, int[3]> colours; colours.insert(std::pair<int,int[3]>(GLUT_LEFT_BUTTON,red)); //THIS IS LINE 24 ! colours.insert(std::pair<int,int[3]>(GLUT_MIDDLE_BUTTON,blue)); colours.insert(std::pair<int,int[3]>(GLUT_RIGHT_BUTTON,green)); However, when I try to compile this code, I get the following error. g++ (Ubuntu 4.4.1-4ubuntu8) 4.4.1 In file included from /usr/include/c++/4.4/bits/stl_algobase.h:66, from /usr/include/c++/4.4/bits/stl_tree.h:62, from /usr/include/c++/4.4/map:60, from ../src/utils.cpp:9: /usr/include/c++/4.4/bits/stl_pair.h: In constructor ‘std::pair<_T1, _T2>::pair(const _T1&, const _T2&) [with _T1 = int, _T2 = int [3]]’: ../src/utils.cpp:24: instantiated from here /usr/include/c++/4.4/bits/stl_pair.h:84: error: array used as initializer /usr/include/c++/4.4/bits/stl_pair.h: In constructor ‘std::pair<_T1, _T2>::pair(const std::pair<_U1, _U2>&) [with _U1 = int, _U2 = int [3], _T1 = const int, _T2 = int [3]]’: ../src/utils.cpp:24: instantiated from here /usr/include/c++/4.4/bits/stl_pair.h:101: error: array used as initializer In file included from /usr/include/c++/4.4/map:61, from ../src/utils.cpp:9: /usr/include/c++/4.4/bits/stl_map.h: In member function ‘_Tp& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](const _Key&) [with _Key = int, _Tp = int [3], _Compare = std::less<int>, _Alloc = std::allocator<std::pair<const int, int [3]> >]’: ../src/utils.cpp:30: instantiated from here /usr/include/c++/4.4/bits/stl_map.h:450: error: conversion from ‘int’ to non-scalar type ‘int [3]’ requested make: *** [src/utils.o] Error 1 I really cant see where the error is. Or even if there's an error. Any help (please include an explanation to help me avoid this mistake) will be appreciated. Thanks in advance.

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  • Is it possible to create static classes in PHP (like in C#)?

    - by aleemb
    I want to create a static class in PHP and have it behave like it does in C#, so Constructor is automatically called on the first call to the class No instantiation required Something of this sort... static class Hello { private static $greeting = 'Hello'; private __construct() { $greeting .= ' There!'; } public static greet(){ echo $greeting; } } Hello::greet(); // Hello There!

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  • How to convert a string into a Point?

    - by NateD
    I have a list of strings of the format "x,y". I would like to make them all into Points. The best Point constructor I can find takes two ints. What is the best way in C# to turn "14,42" into new Point(14,42);? I know the Regex for doing that is /(\d+),(\d+)/, but I'm having a hard time turning those two match groups into ints in C#.

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  • CodeDOM: Adding DebuggerStepThroughAttribute to property

    - by Dont Ask
    I know how to add a DebuggerStepThroughAttribute to a method or a constructor, usually you add it to the CustomAttributes collection of a code member. But I don't see a way to do this for the setter and getter of a C# property, because neither of them provides this collection where you add the attributes. Does anyone have a clue?

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  • Linked List Design

    - by Jim Scott
    The other day in a local .NET group I attend the following question came up: "Is it a valid interview question to ask about Linked Lists when hiring someone for a .NET development position?" Not having a computer sciense degree and being a self taught developer my response was that I did not feel it was appropriate as I in 5 years of developer with .NET had never been exposed to linked lists and did not hear any compeling reason for a use for one. However the person commented that it is a very common interview question so I decided when I left that I would do some reasearch on linked lists and see what I might be missing. I have read a number of posts on stack overflow and various google searches and decided the best way to learn about them was to write my own .NET classes to see how they worked from the inside out. Here is my class structure Single Linked List Constructor public SingleLinkedList(object value) Public Properties public bool IsTail public bool IsHead public object Value public int Index public int Count private fields not exposed to a property private SingleNode firstNode; private SingleNode lastNode; private SingleNode currentNode; Methods public void MoveToFirst() public void MoveToLast() public void Next() public void MoveTo(int index) public void Add(object value) public void InsertAt(int index, object value) public void Remove(object value) public void RemoveAt(int index) Questions I have: What are typical methods you would expect in a linked list? What is typical behaviour when adding new records? For example if I have 4 nodes and I am currently positioned in the second node and perform Add() should it be added after or before the current node? Or should it be added to the end of the list? Some of the designs I have seen explaining things seem to expose outside of the LinkedList class the Node object. In my design you simply add, get, remove values and know nothing about any node object. Should the Head and Tail be placeholder objects that are only used to define the head/tail of the list? I require my Linked List be instantiated with a value which creates the first node of the list which is essentially the head and tail of the list. Would you change that ? What should the rules be when it comes to removing nodes. Should someone be able to remove all nodes? Here is my Double Linked List Constructor public DoubleLinkedList(object value) Properties public bool IsHead public bool IsTail public object Value public int Index public int Count Private fields not exposed via property private DoubleNode currentNode; Methods public void AddFirst(object value) public void AddLast(object value) public void AddBefore(object existingValue, object value) public void AddAfter(object existingValue, object value) public void Add(int index, object value) public void Add(object value) public void Remove(int index) public void Next() public void Previous() public void MoveTo(int index)

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  • Get a QWidget to take up the entire QMainWindow

    - by Bad Man
    I have a class that inherits QMainWindow and I just want it to have a webview widget and nothing else, so here's what I tried doing for constructor: MyWindow::MyWindow(QWidget *parent) : QMainWindow(parent) { this->_webView = new QWebView(this); this->setCentralWidget(this->_webView); } This didnt work do I have to use some kind of layout to make this fill?

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  • boost::multi_array resize exception?

    - by Glen
    I'm trying to figure out if the boost::multi_array constructor or resize method can throw a bad_alloc exception (or some other exception indicating the allocation or resize failed). I can't find this information in the documentation anywhere.

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  • How do app servers inject into private fields?

    - by cibercitizen1
    I saw this question http://stackoverflow.com/questions/2021716/inject-into-private-package-or-public-field-or-provide-a-setter about how to manually inject into annotated private fields (The way is adding setters or through a constructor) But, the point is how do an application server (like glassfish, axis2, jboss, ...) is able to inject into a final private field (without adding setters or constructors to the user class)? Quoting the cited question: public SomeClass { @Inject private SomeResource resource; } Do they use a customized JVM (not the standard one) that allows to access private fields? Thanks

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  • Catching typos in scripting languages

    - by Geo
    If your scripting language of choice doesn't have something like Perl's strict mode, how are you catching typos? Are you unit testing everything? Every constructor, every method? Is this the only way to go about it?

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  • Tab control in Silverlight 3.0 and Dirty data

    - by Vinayak Bhosale
    We are using tab control in our project. While using this control i came across a few issues like - When the tab control loads, it invokes constructor of all the xaml pages that form the individual tabs. Can this be avoided? Is there any event with tab control that we can use to identify dirty data on the previous tab that i may have visited. I mean can i prevent user from navigating to some other tab before saving the changes on current tab.

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  • What are the causes and solutions to a CS0122 error when sending onto an MSMQ queue from C#?

    - by Erick
    Having created a System.Messaging.MessageQueue using the MessageQueue(string queuePath) constructor, attempting to use MessageQueue.Send(obj) results in a 'Unable to generate a temporary class (result=1)' exception with the additional text: 'error CS0122: 'System.__ComObject' is inaccessible due to its protection level'. The queue itself has full control given to EVERYONE. When querying the MessageQueue object for it's read write permissions, it returns SendAndReceive. What causes this error and how do you resolve it?

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  • can you explain this jquery method from jquery.js

    - by mrblah
    Trying to understand how jquery works under the covers, what's the difference between: jQuery.fn and jQuery.prototype jQuery = window.jQuery = window.$ = function( selector, context ) { // The jQuery object is actually just the init constructor 'enhanced' return new jQuery.fn.init( selector, context ); }, and then: jQuery.fn = jQuery.prototype = { init: function( selector, context ) {

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