What will happen if we didn't release Direct2D objects?

Question

There are several device-dependent and device-independent resources in my Direct2D application.

I wonder, what if I didnt Release() them after the application exists? What will happen is likely a memory leak. Does window handles that automatically? Or we must release in order to free hardware memory?

Answer 1

All process resources are released when a process is terminated

There is In M. Russinovich book, Windows Internals :

In whatever way a process ceases to exist, there can never be any leaks. That is, all process’s private
memory is freed automatically by the kernel, the address space is destroyed, all handles to kernel
objects are closed, etc. If open handles to the process still exist (the EPROCESS structure still exists), then
other processes can still gain access to some process-management information, such as the process
exit code (GetExitCodeProcess). Once these handles are closed, the EPROCESS is properly destroyed,
and there’s truly nothing left of the process.