Accessing static class variables in C++?
You must add the following line in the implementation file: int Foo::bar = you_initial_value_here; This is required so the compiler has a place for the static variable.
static
Patterns or practices for unit testing methods that call a static method
Using dependency injection (either option 2 or 4) is definitely my preferred method of attacking this. Not only does it make testing easier it helps to separate concerns and keep classes from getting bloated. A clarification I need to make though is it is not true that static methods are hard to test. The problem … Read more
How to inherit static methods from base class in JavaScript?
In the classical (OO) inheritance pattern, the static methods do not actually get inherited down. Therefore if you have a static method, why not just call: SuperClass.static_method() whenever you need it, no need for JavaScript to keep extra references or copies of the same method. You can also read this JavaScript Override Patterns to get … Read more
C++, static vs. namespace vs. singleton
As noted, using global variables is generally bad engineering practice, unless absolutely needed of course (mapping hardware for example, but that doesn’t happen THAT often). Stashing everything in a class is something you would do in a Java-like language, but in C++ you don’t have to, and in fact using namespaces here is a superior … Read more
Quick Java question about private static final keywords for fields
I use Checkstyle with Eclipse, which results in a warning if the declaration is in a different order to the one you’ve specified, citing the Java Language Specification (JLS). For example, private final static String filename = “filename.txt”; results in ‘static’ modifier out of order with the JLS suggestions. They have this page which lists … Read more
Creating static Mac OS X C build
It is not supported in Mac OS X’s gcc: http://discussions.apple.com/message.jspa?messageID=11053384 Perhaps that “-static” flag flat out won’t work on MacOS X. Not all features of gcc are implemented on MacOS X. Apple won’t even be using gcc in future versions of the OS. I don’t know how to link using “-static”. I can’t think of … Read more
Use dependency injection in static class
You basically have two options: Change the class from static to an instance class and supply the dependency through Constructor Injection. Supply the dependency to the class’s public method through Method Injection. Here are examples for each option. Option 1. Change the class from static to an instance class Change the class from static to … Read more
static and extern global variables in C and C++
Global variables are not extern nor static by default on C and C++. When you declare a variable as static, you are restricting it to the current source file. If you declare it as extern, you are saying that the variable exists, but are defined somewhere else, and if you don’t have it defined elsewhere … Read more
Scope of static Variable in multi-user ASP.NET web application
Does static variables retain their values across user sessions? Yes, that’s why you should be VERY careful when you use static variables in a web app. You will run in concurrency issues as more than one thread servicing a request can modify the value of the variable. While this works in single-user environment, What happens … Read more