non-static vs. static function and variable

Question

I have one question about static and non-static function and variable.

1) non-static function access static variable.

It\'s OK!

class Bar
{
publ         


        

Answer 1

static function access non-static variable

It's OK or not OK? I am puzzled about this!

When called, a static function isn't bound to an instance of the class. Class instances (objects) are going to be the entities that hold the "non-static" variables. Therefore, from the static function, you won't be able to access them without actually being passed or storing elsewhere a specific instance to operate on.

So yes, the code in your last example is valid, because you are passed in an instance. However, you could not do:

static void staticFunction()
{
    // error, this function is static, and is therefore
    // not bound to a specific instance when called
    i = 5;


}