not sure about it.. but compiles..

Utilities/SMutex.cpp

@@ -1,6 +1,7 @@
 #include <stdafx.h>
 #include <Utilities/SMutex.h>
 
+
 __forceinline void SM_Sleep()
 {
 	Sleep(1);
@@ -8,7 +9,7 @@ __forceinline void SM_Sleep()
 
 __forceinline size_t SM_GetCurrentThreadId()
 {
-	return std::this_thread::get_id().hash();
+	return std::hash<std::thread::id>()(std::this_thread::get_id());
 }
 
 __forceinline u32 SM_GetCurrentCPUThreadId()