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You only use static functions if you want to limit the access to a function to the file they are declared. So you actively restrict access by declaring it static... The only requirement for implementations in the header file, is for c++ template functions and template class member functions.
Yes there is difference between declaring a static variable as global and local. If it is local, it can be accessed only in the function where it's declared. But if it is global, all functions can access it.
Static Function MembersBy declaring a function member as static, you make it independent of any particular object of the class. A static member function can be called even if no objects of the class exist and the static functions are accessed using only the class name and the scope resolution operator ::.
A static function in C is a function that has a scope that is limited to its object file. This means that the static function is only visible in its object file. A function can be declared as static function by placing the static keyword before the function name.
Remove static keyword in method definition. Keep it just in your class definition.
static keyword placed in .cpp file means that a certain function has a static linkage, ie. it is accessible only from other functions in the same file.
Keywords static and virtual should not be repeated in the definition. They should only be used in the class declaration.
You don't need to have static in function definition
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