80 lines
2.5 KiB
C++
80 lines
2.5 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2010-2018 Danny Robson <danny@nerdcruft.net>
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*/
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#pragma once
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namespace cruft::iterator {
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///////////////////////////////////////////////////////////////////////////
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template <typename OutputIt, typename FunctionT>
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OutputIt
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_transform_by_block (
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const cruft::view<OutputIt> &,
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OutputIt cursor,
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FunctionT &&
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) {
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return cursor;
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}
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//-------------------------------------------------------------------------
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template <typename OutputIt, typename FunctionT, typename InputT, typename ...TailT>
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OutputIt
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_transform_by_block (
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const cruft::view<OutputIt> &dst,
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OutputIt cursor,
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FunctionT &&func,
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const InputT &_src,
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TailT &&...tail
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) {
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auto remain = _src;
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if (cursor != dst.begin ()) {
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auto infill = std::distance (cursor, dst.end ());
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if (remain.size () < static_cast<size_t> (infill)) {
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return _transform_by_block (
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dst,
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std::copy_n (remain.begin (), remain.size (), cursor),
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std::forward<FunctionT> (func),
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std::forward<TailT> (tail)...
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);
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}
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std::copy_n (remain.begin (), infill, cursor);
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func (dst);
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cursor = dst.begin ();
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remain = { remain.begin () + infill, remain.end () };
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}
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while (remain.size () >= dst.size ()) {
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std::copy_n (remain.begin (), dst.size (), dst.begin ());
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func (dst);
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remain = { remain.begin () + dst.size (), remain.end () };
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}
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return _transform_by_block (
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dst,
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std::copy (remain.begin (), remain.end (), cursor),
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std::forward<FunctionT> (func),
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std::forward<TailT> (tail)...
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);
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}
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//-------------------------------------------------------------------------
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template <typename OutputIt, typename FunctionT, typename ...Args>
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OutputIt
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transform_by_block (const cruft::view<OutputIt> &dst, FunctionT &&func, Args &&...src)
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{
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return _transform_by_block (
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dst,
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dst.begin (),
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std::forward<FunctionT> (func),
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std::forward<Args> (src)...
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);
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}
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};
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