tuple_first_ntuple_first_nTupleFirstNTupleFirstN (Operator)


tuple_first_ntuple_first_nTupleFirstNTupleFirstN — Select the first elements of a tuple up to the index “n”.


tuple_first_n( : : Tuple, Index : Selected)

Herror tuple_first_n(const Hlong Tuple, const Hlong Index, Hlong* Selected)

Herror T_tuple_first_n(const Htuple Tuple, const Htuple Index, Htuple* Selected)

void TupleFirstN(const HTuple& Tuple, const HTuple& Index, HTuple* Selected)

HTuple HTuple::TupleFirstN(const HTuple& Index) const

static void HOperatorSet.TupleFirstN(HTuple tuple, HTuple index, out HTuple selected)

HTuple HTuple.TupleFirstN(HTuple index)


tuple_first_ntuple_first_nTupleFirstNTupleFirstNTupleFirstN selects the first elements of TupleTupleTupleTupletuple up to the index IndexIndexIndexIndexindex and returns them in SelectedSelectedSelectedSelectedselected. Indices of tuple elements start at 0, that means, the first tuple element has got the index 0. In total, IndexIndexIndexIndexindex+1 elements are returned.

IndexIndexIndexIndexindex must contain a single integer value (or a floating point number that represents an integer value without fraction).

Exception: Empty input tuple

If TupleTupleTupleTupletuple is empty, an exception is raised.

HDevelop In-line Operation

HDevelop provides an in-line operation for tuple_first_ntuple_first_nTupleFirstNTupleFirstNTupleFirstN, which can be used in an expression in the following syntax:

Selected := firstn(Tuple, Index)

Execution Information


TupleTupleTupleTupletuple (input_control)  tuple(-array) HTupleHTupleHtuple (integer / real / string) (int / long / double / string) (Hlong / double / HString) (Hlong / double / char*)

Input tuple.

IndexIndexIndexIndexindex (input_control)  integer HTupleHTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Index of the last element to select.

SelectedSelectedSelectedSelectedselected (output_control)  tuple(-array) HTupleHTupleHtuple (integer / real / string) (int / long / double / string) (Hlong / double / HString) (Hlong / double / char*)

Selected tuple elements.


tuple_last_ntuple_last_nTupleLastNTupleLastNTupleLastN, tuple_selecttuple_selectTupleSelectTupleSelectTupleSelect, tuple_str_bit_selecttuple_str_bit_selectTupleStrBitSelectTupleStrBitSelectTupleStrBitSelect, tuple_concattuple_concatTupleConcatTupleConcatTupleConcat, tuple_select_masktuple_select_maskTupleSelectMaskTupleSelectMaskTupleSelectMask

See also