programming:cpp:Cpp Class Static data and functionsWhat links here?
A static member of a class is created once, when the program starts. There is only one static member, but each instance of the class can access it as if it were part of that particular instance.

A static data member can be initialized in a source file like a regular global variable:

int Test::public_int = 3;


class Test {
public:
    static int public_int;
private:
    static int private_int;
}


int main() { Test::public_int = 145; // ok Test::private_int = 12; // wrong, don't touch // the private parts return (0); }


A static function can only access the static data of the member. A public static function can be called without specifying an existing object:
Test::static_method(data)
or with an object:

    Test    foo;
    foo.static_method(data)


A C++ static member is like a Programming Ruby:Ruby Programming Ruby:Ruby Data Storage.
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last edit:April 09 2009 23:03:08 (6000 days ago)
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