#define SILC_PTR_TO_32 ...

    Type casts a pointer's value into a 32-bit integer.  Use this to
    avoid compiler warnings when type casting pointers to integers
    of different size.

    #if SILC_SIZEOF_VOID_P < 8
    #define SILC_PTR_TO_32(_ptr__) ((SilcUInt32)(_ptr__))
    #else
    #define SILC_PTR_TO_32(_ptr__)                                          \
      ((SilcUInt32)((SilcUInt64)(_ptr__) & (SilcUInt32)0xFFFFFFFFUL))
    #endif