_bit_byte
((name)[_bit_byte(__tbit)] & _bit_mask(__tbit)); \
((name)[_bit_byte(__sbit)] |= _bit_mask(__sbit)); \
((name)[_bit_byte(__cbit)] &= ~_bit_mask(__cbit)); \
_bit_byte(i++);
i, _bit_byte(i), _bit_mask(i), bitstr_size(i));