Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/Flags.h @ 14:59f1bd90b2a0

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author Franz Glasner <fzglas.hg@dom66.de>
date Wed, 17 Sep 2025 20:35:45 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * Copyright 2020 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 "BitHacks.h"
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10 #include <cstddef>
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11 #include <iterator>
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12 #include <type_traits>
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14 namespace ZXing {
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16 template<typename Enum>
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17 class Flags
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18 {
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19 static_assert(std::is_enum<Enum>::value, "Flags is only usable on enumeration types.");
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21 using Int = typename std::underlying_type<Enum>::type;
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22 Int i = 0;
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24 constexpr inline Flags(Int other) : i(other) {}
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25 constexpr static inline unsigned highestBitSet(Int x) noexcept { return x < 2 ? x : 1 + highestBitSet(x >> 1); }
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27 public:
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28 using enum_type = Enum;
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30 constexpr inline Flags() noexcept = default;
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31 constexpr inline Flags(Enum flag) noexcept : i(Int(flag)) {}
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33 // constexpr inline Flags(std::initializer_list<Enum> flags) noexcept
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34 // : i(initializer_list_helper(flags.begin(), flags.end()))
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35 // {}
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37 class iterator
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38 {
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39 friend class Flags;
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40 const Int _flags = 0;
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41 int _pos = 0;
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42 iterator(Int i, int p) : _flags(i), _pos(p) {}
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43 public:
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44 using iterator_category = std::input_iterator_tag;
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45 using value_type = Enum;
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46 using difference_type = std::ptrdiff_t;
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47 using pointer = Enum*;
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48 using reference = Enum&;
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50 Enum operator*() const noexcept { return Enum(1 << _pos); }
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52 iterator& operator++() noexcept
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53 {
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54 while (++_pos < BitHacks::HighestBitSet(_flags) && !((1 << _pos) & _flags))
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55 ;
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56 return *this;
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57 }
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59 bool operator==(const iterator& rhs) const noexcept { return _pos == rhs._pos; }
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60 bool operator!=(const iterator& rhs) const noexcept { return !(*this == rhs); }
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61 };
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63 iterator begin() const noexcept { return {i, BitHacks::NumberOfTrailingZeros(i)}; }
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64 iterator end() const noexcept { return {i, BitHacks::HighestBitSet(i) + 1}; }
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66 bool empty() const noexcept { return i == 0; }
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67 int count() const noexcept { return BitHacks::CountBitsSet(i); }
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69 constexpr inline bool operator==(Flags other) const noexcept { return i == other.i; }
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71 inline Flags& operator&=(Flags mask) noexcept { return i &= mask.i, *this; }
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72 inline Flags& operator&=(Enum mask) noexcept { return i &= Int(mask), *this; }
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73 inline Flags& operator|=(Flags other) noexcept { return i |= other.i, *this; }
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74 inline Flags& operator|=(Enum other) noexcept { return i |= Int(other), *this; }
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75 // inline Flags &operator^=(Flags other) noexcept { return i ^= other.i, *this; }
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76 // inline Flags &operator^=(Enum other) noexcept { return i ^= Int(other), *this; }
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78 constexpr inline Flags operator&(Flags other) const noexcept { return i & other.i; }
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79 constexpr inline Flags operator&(Enum other) const noexcept { return i & Int(other); }
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80 constexpr inline Flags operator|(Flags other) const noexcept { return i | other.i; }
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81 constexpr inline Flags operator|(Enum other) const noexcept { return i | Int(other); }
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82 // constexpr inline Flags operator^(Flags other) const noexcept { return i ^ other.i; }
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83 // constexpr inline Flags operator^(Enum other) const noexcept { return i ^ Int(other); }
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84 // constexpr inline Flags operator~() const noexcept { return ~i; }
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86 // constexpr inline operator Int() const noexcept { return i; }
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87 // constexpr inline bool operator!() const noexcept { return !i; }
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88 // constexpr inline Int asInt() const noexcept { return i; }
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90 constexpr inline bool testFlag(Enum flag) const noexcept
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91 {
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92 return (i & Int(flag)) == Int(flag) && (Int(flag) != 0 || i == Int(flag));
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93 }
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94 constexpr inline bool testFlags(Flags mask) const noexcept { return i & mask.i; }
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95 inline Flags& setFlag(Enum flag, bool on = true) noexcept
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96 {
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97 return on ? (*this |= flag) : (*this &= ~Int(flag));
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98 }
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99 inline void clear() noexcept { i = 0; }
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100
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101 constexpr static Flags all() noexcept { return ~(unsigned(~0) << highestBitSet(Int(Enum::_max))); }
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102
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103 private:
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104 // constexpr static inline Int
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105 // initializer_list_helper(typename std::initializer_list<Enum>::const_iterator it,
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106 // typename std::initializer_list<Enum>::const_iterator end) noexcept
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107 // {
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108 // return (it == end ? Int(0) : (Int(*it) | initializer_list_helper(it + 1, end)));
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109 // }
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110 };
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111
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112 #define ZX_DECLARE_FLAGS(FLAGS, ENUM) \
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113 using FLAGS = Flags<ENUM>; \
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114 constexpr inline FLAGS operator|(FLAGS::enum_type e1, FLAGS::enum_type e2) noexcept { return FLAGS(e1) | e2; } \
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115 constexpr inline FLAGS operator|(FLAGS::enum_type e, FLAGS f) noexcept { return f | e; } \
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116 constexpr inline bool operator==(FLAGS::enum_type e, FLAGS f) noexcept { return FLAGS(e) == f; } \
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117 constexpr inline bool operator==(FLAGS f, FLAGS::enum_type e) noexcept { return FLAGS(e) == f; }
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118
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119 } // ZXing
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120