bool Available() const return fn != nullptr; void Get(FILETIME *out) if (fn) fn(out); return; GetInterpolatedFileTime(out); // from earlier code
Before Windows 8, developers primarily relied on GetSystemTimeAsFileTime . While functional, its resolution is limited by the system timer tick, typically ranging between 1ms and 15.6ms. For high-frequency trading, scientific simulations, or fine-grained logging, this jitter is unacceptable. getsystemtimepreciseasfiletime windows 7 patched
A robust implementation for a "Windows 7 patched" timing utility often looks like this in C++: typedef VOID (WINAPI *PGSTPAF)(LPFILETIME); bool Available() const return fn
// Path A: Windows 8+ Official API if (g_GetPreciseTime) A robust implementation for a "Windows 7 patched"
Calling GetSystemTimeAsFileTime to get the base wall-clock time.
Since we cannot link against a function that doesn't exist in the Windows 7 import tables, we have to write a wrapper that safely falls back to the best available method.