#define outpsize
#define some(f) \
    foo(f)

class CRC
{
public:
    int foo;
// Initial CRC Start Value
    #define 24BITCRC ((ULONG) 0x00864CFB) // This line is not aligned with the other lines
    char ch;
    #define MULTI LINE DEFINE \
        in column 0 \
        that spans
//// Operations ////
public:
    ...
}

{
#if defined(WIN32)
    SYSTEMTIME st;
    DWORD ThreadId;
#else
    struct timeval mytv;
    struct tm *mytm;
    pid_t ProcessId;
#endif

#if SOME COND
    (void)loop;
#endif
}