c('PL_get_stdbool')

Availability:C-language interface function

bool PL_get_bool(term_t +t, int *val)

bool PL_get_stdbool(term_t +t, bool *val)

If t has the value true, false, set val to the C constant TRUE or FALSE and return success, otherwise return failure. The values on, 1, off, 0 and are also accepted. PL_get_stdbool_ex() deals with the C11 bool type while PL_get_bool_ex() targetted C standard versions before the introduction of bool.