This feels like a dumb question, but what is the best way to initialize a private, static data member in C++? I tried this but it gives me weird linker errors: class foo { private: static int i; }; int foo::i = 0; I'm guessing this is because I can't initialize a private member from outside the class. So what's the best...
When I write code like this in VS 2008: .h struct Patterns { string ptCreate; string ptDelete; string ptDrop; string ptUpdate; string ptInsert; string ptSelect; }; class QueryValidate { string query; string pattern; static Patterns pts; public: friend class Query; QueryValidate...
When you lock an object is that object locked throughout the whole application? For Example, this snippet from C# 3.0 in a Nutshell Section 19.6.1 "Thread Safety and .NET Framework Types": static void AddItems( ) { for (int i = 0; i < 100; i++) lock (list) list.Add ("Item " + list.Count); string[] items; l...
Hi folks, if i have a standard ASP.NET application, is there any difference between making an object static as opposed to putting the object instance in the Application state? from my understanding, both objects exist ONCE for the app domain. Secondly, what happens if you have a static object in a referenced dll, for an ASP.NET site. ...
I'm looking at some open source Java projects to get into Java and notice a lot of them have some sort of 'constants' interface. For instance, processing.org has an interface called PConstants.java, and most other core classes implement this interface. The interface is riddled with static members. Is there a reason for this approach, or...
I have a WPF program to which I need to add a "Demo mode". Since I want my designers to be able to modify the demo mode without me having to recompile the program each time, I tough it would be a great idea to use a storyboard from an external XAML file. The "Demo mode" is basically a storyboard animating some of the application's depend...
Let's consider a C++ class. At the beginning of the execution I want to read a set of values from an XML file and assign them to 7 of the data members of this class. Those values do not change during the whole execution and they have to be shared by all the objects / instances of the class in question. Are static data members the most el...
Given an hypothetical utility class that is used only in program setup: class MyUtils { private static MyObject myObject = new MyObject(); /*package*/static boolean doStuff(Params... params) { // do stuff with myObject and params... } } will myObject be garbage collected when it is no longer being used, or will it stic...
I'm trying to create a generic function that removes duplicates from an std::vector. Since I don't want to create a function for each vector type, I want to make this a template function that can accept vectors of any type. Here is what I have: //foo.h Class Foo { template<typename T> static void RemoveVectorDuplicates(std::vector<T...
So I was looking at some code that was checked in and I got all puzzled over: // Amount of days before cancellation can't be done enum Cancellation { Limit = 2 }; Asking the guy who checked it in he argued that it's much better to use enums instead of static variables, bettern than this: private static int CANCELLATION_LIMIT = 2; S...
Every time I come across an implementation of the singleton pattern or any static classes (i.e. classes with (almost) only static members) I wonder whether this isn't actually a hack and therefore heavy abuse of the principle of classes and instances just to design single objects instead of designing classes and creating a single instanc...
I have an ASP.NET application with a lot of dynamic content. The content is the same for all users belonging to a particular client. To reduce the number of database hits required per request, I decided to cache client-level data. I created a static class ("ClientCache") to hold the data. The most-often used method of the class is by ...
(expert C/C++ question) What is the difference between a static member function and an extern "C" linkage function ? For instance, when using "makecontext" in C++, I need to pass a pointer to function. Google recommends using extern "C" linkage for it, because "makecontext" is C. But I found out that using static works as well. Am I just...
For a debugging and logging library, I want to be able to find, at runtime, a list of all of the source files that the project has compiled and linked. I assume I'll be including some kind of header in each source file, and the preprocessor __FILE__ macro can give me a character constant for that file, so I just need to somehow "broadcas...
Is a static variable in a webservice shared between all running invocations of the webservice on a server? In my case I want a server-wide sync-lock, and I beleive I can accomplish that with a single private static Object syncHandle = new Object(); Is that correct? ...
I have this code: private static $dates = array( 'start' => mktime( 0, 0, 0, 7, 30, 2009), // Start date 'end' => mktime( 0, 0, 0, 8, 2, 2009), // End date 'close' => mktime(23, 59, 59, 7, 20, 2009), // Date when registration closes 'early' => mktime( 0, 0, 0, 3, 19, 2009), // Date when early bird discount ends ...
I’m having some trouble with understanding how IIS is handling static variables on its threads. My understanding has always been that if IIS has 4 worker processes that it can handle 4 requests simultaneously and that it would be the same as having 4 separate threads running the website. Any static variables would persist in each indi...
I occasionally have classes with private static data members. I'm currently debating if I should replace these with static variables in an unnamed namespace in the implementation file. Other that not being able to use these variables in inline methods, are there any other drawbacks? The advantage that I see is that is hides them compl...
Say you want to share some resource, like a class or a variable across all threads/sessions within a ASP.NET web application. What is better? 1) A static variable having thread-safe accessors to that static variable? 2) Or a ASP.NET application session variable? ...
When we serialize objects, static members are not serialized, but if we need to do so, is there any way out? ...