ScopedForeignCallback

RAII struct to cover extern callbacks. This only deals with CPU identification and FPU control words save/restore. But when we used an enabled D runtime, this used to manage thread attachment and disappearance, so calling this on callbacks is still mandated.

struct ScopedForeignCallback (

bool dummyDeprecated

bool saveRestoreFPU

) {

void enter();

~this();

this(this);

}