Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/hb-meta.hh @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 /*
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2 * Copyright © 2018 Google, Inc.
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3 *
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4 * This is part of HarfBuzz, a text shaping library.
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5 *
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6 * Permission is hereby granted, without written agreement and without
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7 * license or royalty fees, to use, copy, modify, and distribute this
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8 * software and its documentation for any purpose, provided that the
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9 * above copyright notice and the following two paragraphs appear in
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10 * all copies of this software.
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11 *
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12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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16 * DAMAGE.
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17 *
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18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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23 *
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24 * Google Author(s): Behdad Esfahbod
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25 */
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27 #ifndef HB_META_HH
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28 #define HB_META_HH
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30 #include "hb.hh"
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32 #include <memory>
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33 #include <type_traits>
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34 #include <utility>
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37 /*
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38 * C++ template meta-programming & fundamentals used with them.
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39 */
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41 /* Void! For when we need a expression-type of void. */
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42 struct hb_empty_t {};
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44 /* https://en.cppreference.com/w/cpp/types/void_t */
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45 template<typename... Ts> struct _hb_void_t { typedef void type; };
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46 template<typename... Ts> using hb_void_t = typename _hb_void_t<Ts...>::type;
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48 template<typename Head, typename... Ts> struct _hb_head_t { typedef Head type; };
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49 template<typename... Ts> using hb_head_t = typename _hb_head_t<Ts...>::type;
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51 template <typename T, T v> struct hb_integral_constant { static constexpr T value = v; };
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52 template <bool b> using hb_bool_constant = hb_integral_constant<bool, b>;
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53 using hb_true_type = hb_bool_constant<true>;
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54 using hb_false_type = hb_bool_constant<false>;
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56 /* Static-assert as expression. */
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57 template <bool cond> struct static_assert_expr;
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58 template <> struct static_assert_expr<true> : hb_false_type {};
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59 #define static_assert_expr(C) static_assert_expr<C>::value
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61 /* Basic type SFINAE. */
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63 template <bool B, typename T = void> struct hb_enable_if {};
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64 template <typename T> struct hb_enable_if<true, T> { typedef T type; };
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65 #define hb_enable_if(Cond) typename hb_enable_if<(Cond)>::type* = nullptr
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66 /* Concepts/Requires alias: */
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67 #define hb_requires(Cond) hb_enable_if((Cond))
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69 template <typename T, typename T2> struct hb_is_same : hb_false_type {};
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70 template <typename T> struct hb_is_same<T, T> : hb_true_type {};
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71 #define hb_is_same(T, T2) hb_is_same<T, T2>::value
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73 /* Function overloading SFINAE and priority. */
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75 #define HB_RETURN(Ret, E) -> hb_head_t<Ret, decltype ((E))> { return (E); }
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76 #define HB_AUTO_RETURN(E) -> decltype ((E)) { return (E); }
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77 #define HB_VOID_RETURN(E) -> hb_void_t<decltype ((E))> { (E); }
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79 template <unsigned Pri> struct hb_priority : hb_priority<Pri - 1> {};
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80 template <> struct hb_priority<0> {};
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81 #define hb_prioritize hb_priority<16> ()
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83 #define HB_FUNCOBJ(x) static_const x HB_UNUSED
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86 template <typename T> struct hb_type_identity_t { typedef T type; };
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87 template <typename T> using hb_type_identity = typename hb_type_identity_t<T>::type;
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89 template <typename T> static inline T hb_declval ();
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90 #define hb_declval(T) (hb_declval<T> ())
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92 template <typename T> struct hb_match_const : hb_type_identity_t<T>, hb_false_type {};
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93 template <typename T> struct hb_match_const<const T> : hb_type_identity_t<T>, hb_true_type {};
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94 template <typename T> using hb_remove_const = typename hb_match_const<T>::type;
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96 template <typename T> struct hb_match_reference : hb_type_identity_t<T>, hb_false_type {};
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97 template <typename T> struct hb_match_reference<T &> : hb_type_identity_t<T>, hb_true_type {};
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98 template <typename T> struct hb_match_reference<T &&> : hb_type_identity_t<T>, hb_true_type {};
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99 template <typename T> using hb_remove_reference = typename hb_match_reference<T>::type;
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100 template <typename T> auto _hb_try_add_lvalue_reference (hb_priority<1>) -> hb_type_identity<T&>;
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101 template <typename T> auto _hb_try_add_lvalue_reference (hb_priority<0>) -> hb_type_identity<T>;
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102 template <typename T> using hb_add_lvalue_reference = decltype (_hb_try_add_lvalue_reference<T> (hb_prioritize));
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103 template <typename T> auto _hb_try_add_rvalue_reference (hb_priority<1>) -> hb_type_identity<T&&>;
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104 template <typename T> auto _hb_try_add_rvalue_reference (hb_priority<0>) -> hb_type_identity<T>;
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105 template <typename T> using hb_add_rvalue_reference = decltype (_hb_try_add_rvalue_reference<T> (hb_prioritize));
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106
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107 template <typename T> struct hb_match_pointer : hb_type_identity_t<T>, hb_false_type {};
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108 template <typename T> struct hb_match_pointer<T *> : hb_type_identity_t<T>, hb_true_type {};
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109 template <typename T> using hb_remove_pointer = typename hb_match_pointer<T>::type;
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110 template <typename T> auto _hb_try_add_pointer (hb_priority<1>) -> hb_type_identity<hb_remove_reference<T>*>;
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111 template <typename T> auto _hb_try_add_pointer (hb_priority<1>) -> hb_type_identity<T>;
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112 template <typename T> using hb_add_pointer = decltype (_hb_try_add_pointer<T> (hb_prioritize));
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113
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114
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115 template <typename T> using hb_decay = typename std::decay<T>::type;
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116
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117 #define hb_is_convertible(From,To) std::is_convertible<From, To>::value
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118
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119 template <typename From, typename To>
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120 using hb_is_cr_convertible = hb_bool_constant<
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121 hb_is_same (hb_decay<From>, hb_decay<To>) &&
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122 (!std::is_const<From>::value || std::is_const<To>::value) &&
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123 (!std::is_reference<To>::value || std::is_const<To>::value || std::is_reference<To>::value)
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124 >;
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125 #define hb_is_cr_convertible(From,To) hb_is_cr_convertible<From, To>::value
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126
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127
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128 struct
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129 {
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130 template <typename T> constexpr auto
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131 operator () (T&& v) const HB_AUTO_RETURN (std::forward<T> (v))
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132
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133 template <typename T> constexpr auto
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134 operator () (T *v) const HB_AUTO_RETURN (*v)
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135
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136 template <typename T> constexpr auto
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137 operator () (const hb::shared_ptr<T>& v) const HB_AUTO_RETURN (*v)
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138
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139 template <typename T> constexpr auto
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140 operator () (hb::shared_ptr<T>& v) const HB_AUTO_RETURN (*v)
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141
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142 template <typename T> constexpr auto
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143 operator () (const hb::unique_ptr<T>& v) const HB_AUTO_RETURN (*v)
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144
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145 template <typename T> constexpr auto
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146 operator () (hb::unique_ptr<T>& v) const HB_AUTO_RETURN (*v)
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147 }
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148 HB_FUNCOBJ (hb_deref);
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149
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150 template <typename T>
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151 struct hb_reference_wrapper
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152 {
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153 hb_reference_wrapper (T v) : v (v) {}
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154 bool operator == (const hb_reference_wrapper& o) const { return v == o.v; }
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diff changeset
155 bool operator != (const hb_reference_wrapper& o) const { return v != o.v; }
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156 operator T () const { return v; }
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157 T get () const { return v; }
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158 T v;
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159 };
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diff changeset
160 template <typename T>
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161 struct hb_reference_wrapper<T&>
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162 {
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163 hb_reference_wrapper (T& v) : v (std::addressof (v)) {}
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164 bool operator == (const hb_reference_wrapper& o) const { return v == o.v; }
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165 bool operator != (const hb_reference_wrapper& o) const { return v != o.v; }
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diff changeset
166 operator T& () const { return *v; }
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167 T& get () const { return *v; }
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168 T* v;
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169 };
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170
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171
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172 /* Type traits */
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173
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174 template <typename T> struct hb_int_min;
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175 template <> struct hb_int_min<char> : hb_integral_constant<char, CHAR_MIN> {};
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176 template <> struct hb_int_min<signed char> : hb_integral_constant<signed char, SCHAR_MIN> {};
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177 template <> struct hb_int_min<unsigned char> : hb_integral_constant<unsigned char, 0> {};
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178 template <> struct hb_int_min<signed short> : hb_integral_constant<signed short, SHRT_MIN> {};
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179 template <> struct hb_int_min<unsigned short> : hb_integral_constant<unsigned short, 0> {};
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180 template <> struct hb_int_min<signed int> : hb_integral_constant<signed int, INT_MIN> {};
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181 template <> struct hb_int_min<unsigned int> : hb_integral_constant<unsigned int, 0> {};
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182 template <> struct hb_int_min<signed long> : hb_integral_constant<signed long, LONG_MIN> {};
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183 template <> struct hb_int_min<unsigned long> : hb_integral_constant<unsigned long, 0> {};
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184 template <> struct hb_int_min<signed long long> : hb_integral_constant<signed long long, LLONG_MIN> {};
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185 template <> struct hb_int_min<unsigned long long> : hb_integral_constant<unsigned long long, 0> {};
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186 template <typename T> struct hb_int_min<T *> : hb_integral_constant<T *, nullptr> {};
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187 #define hb_int_min(T) hb_int_min<T>::value
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188 template <typename T> struct hb_int_max;
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189 template <> struct hb_int_max<char> : hb_integral_constant<char, CHAR_MAX> {};
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190 template <> struct hb_int_max<signed char> : hb_integral_constant<signed char, SCHAR_MAX> {};
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191 template <> struct hb_int_max<unsigned char> : hb_integral_constant<unsigned char, UCHAR_MAX> {};
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192 template <> struct hb_int_max<signed short> : hb_integral_constant<signed short, SHRT_MAX> {};
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193 template <> struct hb_int_max<unsigned short> : hb_integral_constant<unsigned short, USHRT_MAX> {};
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194 template <> struct hb_int_max<signed int> : hb_integral_constant<signed int, INT_MAX> {};
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195 template <> struct hb_int_max<unsigned int> : hb_integral_constant<unsigned int, UINT_MAX> {};
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196 template <> struct hb_int_max<signed long> : hb_integral_constant<signed long, LONG_MAX> {};
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197 template <> struct hb_int_max<unsigned long> : hb_integral_constant<unsigned long, ULONG_MAX> {};
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198 template <> struct hb_int_max<signed long long> : hb_integral_constant<signed long long, LLONG_MAX> {};
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199 template <> struct hb_int_max<unsigned long long> : hb_integral_constant<unsigned long long, ULLONG_MAX> {};
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200 #define hb_int_max(T) hb_int_max<T>::value
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201
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202 #if defined(__GNUC__) && __GNUC__ < 5 && !defined(__clang__)
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203 #define hb_is_trivially_copyable(T) __has_trivial_copy(T)
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204 #define hb_is_trivially_copy_assignable(T) __has_trivial_assign(T)
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205 #define hb_is_trivially_constructible(T) __has_trivial_constructor(T)
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206 #define hb_is_trivially_copy_constructible(T) __has_trivial_copy_constructor(T)
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207 #define hb_is_trivially_destructible(T) __has_trivial_destructor(T)
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208 #else
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209 #define hb_is_trivially_copyable(T) std::is_trivially_copyable<T>::value
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210 #define hb_is_trivially_copy_assignable(T) std::is_trivially_copy_assignable<T>::value
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211 #define hb_is_trivially_constructible(T) std::is_trivially_constructible<T>::value
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212 #define hb_is_trivially_copy_constructible(T) std::is_trivially_copy_constructible<T>::value
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213 #define hb_is_trivially_destructible(T) std::is_trivially_destructible<T>::value
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214 #endif
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215
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216 /* Class traits. */
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217
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218 #define HB_DELETE_COPY_ASSIGN(TypeName) \
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219 TypeName(const TypeName&) = delete; \
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220 void operator=(const TypeName&) = delete
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221 #define HB_DELETE_CREATE_COPY_ASSIGN(TypeName) \
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222 TypeName() = delete; \
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223 TypeName(const TypeName&) = delete; \
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224 void operator=(const TypeName&) = delete
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225
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226 /* hb_unwrap_type (T)
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227 * If T has no T::type, returns T. Otherwise calls itself on T::type recursively.
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228 */
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229
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230 template <typename T, typename>
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231 struct _hb_unwrap_type : hb_type_identity_t<T> {};
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232 template <typename T>
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233 struct _hb_unwrap_type<T, hb_void_t<typename T::type>> : _hb_unwrap_type<typename T::type, void> {};
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234 template <typename T>
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235 using hb_unwrap_type = _hb_unwrap_type<T, void>;
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236 #define hb_unwrap_type(T) typename hb_unwrap_type<T>::type
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237
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238 #endif /* HB_META_HH */