Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/Range.h @ 16:bd5bb0742cc3

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author Franz Glasner <fzglas.hg@dom66.de>
date Wed, 17 Sep 2025 21:11:25 +0200
parents b50eed0cc0ef
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1 /*
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2 * Copyright 2022 Axel Waggershauser
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3 */
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4 // SPDX-License-Identifier: Apache-2.0
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6 #pragma once
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8 #include "ZXAlgorithms.h"
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10 #include <iterator>
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12 namespace ZXing {
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14 template <typename Iterator>
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15 struct StrideIter
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16 {
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17 Iterator pos;
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18 int stride;
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20 using iterator_category = std::random_access_iterator_tag;
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21 using difference_type = typename std::iterator_traits<Iterator>::difference_type;
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22 using value_type = typename std::iterator_traits<Iterator>::value_type;
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23 using pointer = Iterator;
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24 using reference = typename std::iterator_traits<Iterator>::reference;
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26 auto operator*() const { return *pos; }
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27 auto operator[](int i) const { return *(pos + i * stride); }
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28 StrideIter<Iterator>& operator++() { return pos += stride, *this; }
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29 StrideIter<Iterator> operator++(int) { auto temp = *this; ++*this; return temp; }
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30 bool operator!=(const StrideIter<Iterator>& rhs) const { return pos != rhs.pos; }
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31 StrideIter<Iterator> operator+(int i) const { return {pos + i * stride, stride}; }
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32 StrideIter<Iterator> operator-(int i) const { return {pos - i * stride, stride}; }
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33 int operator-(const StrideIter<Iterator>& rhs) const { return narrow_cast<int>((pos - rhs.pos) / stride); }
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34 };
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36 template <typename Iterator>
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37 StrideIter(const Iterator&, int) -> StrideIter<Iterator>;
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40 template <typename Iterator>
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41 struct Range
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42 {
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43 Iterator _begin, _end;
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45 Range(Iterator b, Iterator e) : _begin(b), _end(e) {}
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47 template <typename C>
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48 Range(const C& c) : _begin(std::begin(c)), _end(std::end(c)) {}
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50 Iterator begin() const noexcept { return _begin; }
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51 Iterator end() const noexcept { return _end; }
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52 explicit operator bool() const { return begin() < end(); }
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53 int size() const { return narrow_cast<int>(end() - begin()); }
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54 };
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56 template <typename C>
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57 Range(const C&) -> Range<typename C::const_iterator>;
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59 } // namespace ZXing