Hi Sakamoto-san > > +#define snd_pcm_is_playback(x) _Generic((x), \ > > + int : snd_pcm_direction_is_playback, \ > > + unsigned int : snd_pcm_direction_is_playback, \ > > + unsigned char : snd_pcm_direction_is_playback, \ > > + unsigned short : snd_pcm_direction_is_playback, \ > > + struct snd_pcm_substream *: snd_pcm_substream_is_playback, \ > > + const struct snd_pcm_substream *: snd_pcm_substream_is_playback)(x) (snip) > In my opinion, it is not so important to distinguish some types which can > be converted to integer implicitly/explicitly in the above case. The > 'default' association is available in such case, like: > > +#define snd_pcm_is_playback(x) _Generic((x), \ > + struct snd_pcm_substream *: snd_pcm_substream_is_playback, \ > + const struct snd_pcm_substream *: snd_pcm_substream_is_playback, \ > + default: snd_pcm_direction_is_playback)(x) > > The association would match [u|i][8|16|32|64] and f[32|64] types, and would > not match to any type of pointers. However, it depends on your preference. Wow ! I didn't know _Generic() can use default, and more good things is that it could handle bit-field, too!! It is perfect. Thank you for your help !! Best regards --- Kuninori Morimoto
