1.-3.You cannot exactly know when it happens and so you cannot depend on it. A static constructor will give you a little control what happens when it get called. public class UtilityClass { // // Resources // // r1 will be initialized by the static constructor static Resource1 r1 = null; // r2 will be … Read more
You can rely on this. The ODR (One Definition Rule) says at 3.2/5 in the Standard, where D stands for the non-static function template (cursive font by me) If D is a template, and is defined in more than one translation unit, then the last four requirements from the list above shall apply to names … Read more
Oh, that is complex. It depends on whether the beforefieldinit flag is set, which in turn (in C#) depends on whether there is a static constructor. And worse; in .NET 4 I believe the behaviour changed to make it more “lazy” than it used to be. Frankly, I wouldn’t code to any specific behaviour here; … Read more
A simple solution is to guard the add_subdirectory calls in both the client and the server CMake list file with an if using a TARGET conditional, i.e.: if (NOT TARGET plugin) add_subdirectory(“${CMAKE_SOURCE_DIR}/common/libplugin”) endif() This prevents the libplugin sub-directory from being added more than once.
Initialization is not thread-safe. Two threads can enter the function and both may initialize the function-scope static variable. That’s not good. There’s no telling what the result might be. In C++0x, initialization of function-scope static variables will be thread-safe; the first thread to call the function will initialize the variable and any other threads calling … Read more
While it’s not strictly possible to do, as rightly pointed out, you could always “fake” it by redefining the method on instantiation, like this: class YourClass(object): def __init__(self): self.foo = self._instance_foo @staticmethod def foo(): print “Static!” def _instance_foo(self): print “Instance!” which would produce the desired result: >>> YourClass.foo() Static! >>> your_instance = YourClass() >>> your_instance.foo() … Read more
The differences are: The name is only accessible within the function, and has no linkage. It is initialised the first time execution reaches the definition, not necessarily during the program’s initialisation phases. The second difference can be useful to avoid the static intialisation order fiasco, where global variables can be accessed before they’re initialised. By … Read more
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
YES you can but only for int types. If you want your static member to be any other type, you’ll have to define it somewhere in a cpp file. class A{ private: static const int a = 4; // valid static const std::string t ; // can’t be initialized here … … }; // in … Read more
Anywhere in one compilation unit (usually a .cpp file) would do: foo.h class foo { static const string s; // Can never be initialized here. static const char* cs; // Same with C strings. static const int i = 3; // Integral types can be initialized here (*)… static const int j; // … OR … Read more