| all_tail | Function (ROM Call 0x3B5)

AMS 1.01 or higher | estack.h

short all_tail (CESI_Callback_t f, ESI start_ptr);

Checks whether all elements in the list have some property.

all_tail is similar to map_tail, but callback function f is not void. It needs to return a Boolean value (TRUE or FALSE). If f returns FALSE, any further processing of the list tail will be stopped, even if END_TAG is not reached yet. The result of all_tail is the last value returned from f. In other words, it returns TRUE if and only if the callback function f returns TRUE for each expression in the tail of expressions indexed by element_ptr.
all_tail is very useful to check whether all elements of a list possess some property. Suppose that you defined the following function which checks whether an entry on the expression stack is a positive integer:

    short is_positive_integer (ESI ptr)
    {
      return (*ptr == POSINT_TAG);
    }

and suppose that start_ptr points to the first element of the list (one byte below LIST_TAG). Then, you can use the following call to check whether all elements of the lists are positive integers:

    are_all_positive_integers = all_tail (is_positive_integer, start_ptr);

Uses: next_expression_index
Used by: NG_graphESI, did_push_anti_deriv, did_push_series, push_1st_derivative, push_csolve, push_czeros, push_def_int, push_desolve, push_extended_prod, push_factor, push_lim, push_max, push_min, push_nsolve, push_rec_to_angle, push_solve, push_summation, push_zeros, push_equals, push_exponentiate, push_greater_than, push_greater_than_or_equals, push_less_than, push_less_than_or_equals, push_not_equals, push_product, push_sum, get_ub, is_cFloat_agg, is_constant, push_reciprocal, push_user_func, ROM Call 0x4D1