Is the given 'filenames' iterator pointing at a valid filename.
When this function returns TRUE, notmuch_filenames_get will return
a valid string. Whereas when this function returns FALSE,
notmuch_filenames_get will return NULL.
It is acceptable to pass NULL for 'filenames', in which case this
function will always return FALSE.
Is the given 'filenames' iterator pointing at a valid filename.
When this function returns TRUE, notmuch_filenames_get will return a valid string. Whereas when this function returns FALSE, notmuch_filenames_get will return NULL.
It is acceptable to pass NULL for 'filenames', in which case this function will always return FALSE.