.. SPDX-FileCopyrightText: 2019-2020 Intel Corporation .. .. SPDX-License-Identifier: CC-BY-4.0 ================ ParallelScanFunc ================ **[req.parallel_scan_func]** A type `Scan` satisfies `ParallelScanFunc` if it meets the following requirements: -------------------------------------------------------------------------------- **ParallelScanFunc Requirements: Pseudo-Signature, Semantics** .. cpp:function:: Value Scan::operator()(const Range& r, const Value& sum, bool is_final) const Starting with ``sum``, computes the summary and, for ``is_final == true``, the scan result for range ``r``. Returns the computed summary. ``Value`` type must be the same as a corresponding template parameter for the ``parallel_scan`` algorithm. See also: * :doc:`parallel_scan algorithm <../../algorithms/functions/parallel_scan_func>`