What is the alternative to std::atexit in C++ - console

Question

I wanted to remove file when the program is closed, but not ended. I tried to do it with function std::atexit, but its parameter can't be pointer to a function if that's class member function. So I was wondering is there any simple alternative?
class User
{
std::experimental::filesystem::path file_path;
std::experimental::filesystem::path & get_file_path();
void clean_file_path();
void (User::*x)();
}
int main()
{
std::experimental::filesystem::path p = user.get_file_path();
user.x = & User::clean_file_path;
std::ofstream output(p, std::ios::binary | std::ios::trunc);
std::atexit(user.x);
}

Answer 1

You could have a static function inside your class and you could call "atexit" with a pointer to this static function:
class User
{
public:
void clean();
static void cleanStatic();
};
int main()
{
void (User:: * pClean)() = &User::clean;
void (*pCleanStatic)() = &User::cleanStatic;
std::atexit(pCleanStatic);
}
You can register multiple functions with "atexit" but there is a limit to that number so maybe registering only one function that will handle the work for all the objects is a better solution.
One more thing: the type of pCleanStatic and the type of pClean are not the same:
pCleanStatic is void(*)()
pClean is void(User::*)()
"atexit" expects a parameter of type void(*)(). So only pCleanStatic will be accepted as a parameter. In Visual Studio, if you try to compile the code
std::atexit(pClean);
you'll get the following error:
error C2664: 'int atexit(void (__cdecl *)(void))': cannot convert argument 1 from 'void (__thiscall User::* )(void)' to 'void (__cdecl *)(void)'
mentioning the two different types.