#if defined(_LIBCPP_WIN32API)
+#if _WIN32_WINNT < _WIN32_WINNT_WIN8
+
+namespace {
+
+typedef void(WINAPI *GetSystemTimeAsFileTimePtr)(LPFILETIME);
+
+class GetSystemTimeInit {
+public:
+ GetSystemTimeInit() {
+ fp = (GetSystemTimeAsFileTimePtr)GetProcAddress(
+ GetModuleHandleW(L"kernel32.dll"), "GetSystemTimePreciseAsFileTime");
+ if (fp == nullptr)
+ fp = GetSystemTimeAsFileTime;
+ }
+ GetSystemTimeAsFileTimePtr fp;
+};
+
+GetSystemTimeInit GetSystemTimeAsFileTimeFunc _LIBCPP_INIT_PRIORITY_MAX;
+} // namespace
+
+#endif
+
static system_clock::time_point __libcpp_system_clock_now() {
// FILETIME is in 100ns units
using filetime_duration =
static _LIBCPP_CONSTEXPR const seconds nt_to_unix_epoch{11644473600};
FILETIME ft;
-#if _WIN32_WINNT >= _WIN32_WINNT_WIN8 && WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+#if (_WIN32_WINNT >= _WIN32_WINNT_WIN8 && WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)) || \
+ (_WIN32_WINNT >= _WIN32_WINNT_WIN10)
GetSystemTimePreciseAsFileTime(&ft);
-#else
+#elif !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
GetSystemTimeAsFileTime(&ft);
+#else
+ GetSystemTimeAsFileTimeFunc.fp(&ft);
#endif
filetime_duration d{(static_cast<__int64>(ft.dwHighDateTime) << 32) |