class WinFFI::LARGE_INTEGER

msdn.microsoft.com/en-us/library/windows/desktop/aa383713(v=vs.85).aspx class LARGE_INTEGER_STRUCT < FFIAdditions::Struct

layout LowPart:  :dword,
       HighPart: :long

end

class LARGE_INTEGER < FFIAdditions::Union

layout s: LARGE_INTEGER_STRUCT,
       u: LARGE_INTEGER_STRUCT

end