Since you need an instance, you either have to create one, use a static instance, or pas it to call()
:
Class Test
{
private:
static Test instance;
public:
void Check(){//dosomething};
// use one of the following:
static void call(Test& t){ t.check(); };
static void call(){ Test t; t.check(); };
static void call(){ instance.check(); };
};