Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/hb-cplusplus.hh @ 32:72c1b70d4f5c

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * Copyright © 2022 Behdad Esfahbod
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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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25 #ifndef HB_CPLUSPLUS_HH
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26 #define HB_CPLUSPLUS_HH
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28 #include "hb.h"
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30 HB_BEGIN_DECLS
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31 HB_END_DECLS
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33 #ifdef __cplusplus
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35 #include <functional>
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36 #include <utility>
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38 #if 0
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39 #if !(__cplusplus >= 201103L)
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40 #error "HarfBuzz C++ helpers require C++11"
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41 #endif
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42 #endif
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44 namespace hb {
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47 template <typename T>
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48 struct vtable;
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50 template <typename T>
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51 struct shared_ptr
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52 {
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53 using element_type = T;
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55 using v = vtable<T>;
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57 explicit shared_ptr (T *p = nullptr) : p (p) {}
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58 shared_ptr (const shared_ptr &o) : p (v::reference (o.p)) {}
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59 shared_ptr (shared_ptr &&o) : p (o.p) { o.p = nullptr; }
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60 shared_ptr& operator = (const shared_ptr &o) { if (p != o.p) { destroy (); p = o.p; reference (); } return *this; }
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61 shared_ptr& operator = (shared_ptr &&o) { v::destroy (p); p = o.p; o.p = nullptr; return *this; }
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62 ~shared_ptr () { v::destroy (p); p = nullptr; }
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64 T* get() const { return p; }
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66 void swap (shared_ptr &o) { std::swap (p, o.p); }
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67 friend void swap (shared_ptr &a, shared_ptr &b) { std::swap (a.p, b.p); }
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69 operator T * () const { return p; }
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70 T& operator * () const { return *get (); }
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71 T* operator -> () const { return get (); }
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72 operator bool () const { return p; }
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73 bool operator == (const shared_ptr &o) const { return p == o.p; }
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74 bool operator != (const shared_ptr &o) const { return p != o.p; }
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75
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76 static T* get_empty() { return v::get_empty (); }
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77 T* reference() { return v::reference (p); }
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78 void destroy() { v::destroy (p); }
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79 void set_user_data (hb_user_data_key_t *key,
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80 void *value,
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81 hb_destroy_func_t destroy,
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82 hb_bool_t replace) { v::set_user_data (p, key, value, destroy, replace); }
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83 void * get_user_data (hb_user_data_key_t *key) { return v::get_user_data (p, key); }
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85 private:
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86 T *p;
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87 };
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89 template<typename T> struct is_shared_ptr : std::false_type {};
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90 template<typename T> struct is_shared_ptr<shared_ptr<T>> : std::true_type {};
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92 template <typename T>
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93 struct unique_ptr
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94 {
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95 using element_type = T;
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97 using v = vtable<T>;
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diff changeset
99 explicit unique_ptr (T *p = nullptr) : p (p) {}
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100 unique_ptr (const unique_ptr &o) = delete;
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diff changeset
101 unique_ptr (unique_ptr &&o) : p (o.p) { o.p = nullptr; }
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102 unique_ptr& operator = (const unique_ptr &o) = delete;
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103 unique_ptr& operator = (unique_ptr &&o) { v::destroy (p); p = o.p; o.p = nullptr; return *this; }
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104 ~unique_ptr () { v::destroy (p); p = nullptr; }
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105
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106 T* get() const { return p; }
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107 T* release () { T* v = p; p = nullptr; return v; }
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108
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109 void swap (unique_ptr &o) { std::swap (p, o.p); }
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110 friend void swap (unique_ptr &a, unique_ptr &b) { std::swap (a.p, b.p); }
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111
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112 operator T * () const { return p; }
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113 T& operator * () const { return *get (); }
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114 T* operator -> () const { return get (); }
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115 operator bool () { return p; }
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116
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117 private:
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118 T *p;
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119 };
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120
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121 template<typename T> struct is_unique_ptr : std::false_type {};
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122 template<typename T> struct is_unique_ptr<unique_ptr<T>> : std::true_type {};
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123
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124 template <typename T,
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125 T * (*_get_empty) (void),
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126 T * (*_reference) (T *),
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127 void (*_destroy) (T *),
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128 hb_bool_t (*_set_user_data) (T *,
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129 hb_user_data_key_t *,
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130 void *,
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131 hb_destroy_func_t,
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132 hb_bool_t),
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133 void * (*_get_user_data) (const T *,
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134 hb_user_data_key_t *)>
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135 struct vtable_t
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136 {
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137 static constexpr auto get_empty = _get_empty;
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138 static constexpr auto reference = _reference;
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139 static constexpr auto destroy = _destroy;
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140 static constexpr auto set_user_data = _set_user_data;
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141 static constexpr auto get_user_data = _get_user_data;
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142 };
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143
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144 #define HB_DEFINE_VTABLE(name) \
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145 template<> \
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146 struct vtable<hb_##name##_t> \
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147 : vtable_t<hb_##name##_t, \
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148 &hb_##name##_get_empty, \
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149 &hb_##name##_reference, \
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150 &hb_##name##_destroy, \
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151 &hb_##name##_set_user_data, \
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152 &hb_##name##_get_user_data> {}
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153
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154 HB_DEFINE_VTABLE (buffer);
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155 HB_DEFINE_VTABLE (blob);
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156 HB_DEFINE_VTABLE (face);
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157 HB_DEFINE_VTABLE (font);
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158 HB_DEFINE_VTABLE (font_funcs);
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159 HB_DEFINE_VTABLE (map);
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diff changeset
160 HB_DEFINE_VTABLE (set);
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161 HB_DEFINE_VTABLE (shape_plan);
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162 HB_DEFINE_VTABLE (unicode_funcs);
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163
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diff changeset
164 #undef HB_DEFINE_VTABLE
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165
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166
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167 #ifdef HB_SUBSET_H
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168
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169 #define HB_DEFINE_VTABLE(name) \
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170 template<> \
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171 struct vtable<hb_##name##_t> \
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172 : vtable_t<hb_##name##_t, \
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173 nullptr, \
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174 &hb_##name##_reference, \
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175 &hb_##name##_destroy, \
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176 &hb_##name##_set_user_data, \
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177 &hb_##name##_get_user_data> {}
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178
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179
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180 HB_DEFINE_VTABLE (subset_input);
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181 HB_DEFINE_VTABLE (subset_plan);
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182
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diff changeset
183 #undef HB_DEFINE_VTABLE
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184
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185 #endif
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186
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187
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188 } // namespace hb
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189
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190 /* Workaround for GCC < 7, see:
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191 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56480
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192 * https://stackoverflow.com/a/25594741 */
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diff changeset
193 namespace std {
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194
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195
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diff changeset
196 template<typename T>
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diff changeset
197 struct hash<hb::shared_ptr<T>>
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198 {
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199 std::size_t operator()(const hb::shared_ptr<T>& v) const noexcept
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200 {
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201 std::size_t h = std::hash<decltype (v.get ())>{}(v.get ());
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202 return h;
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203 }
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204 };
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205
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206 template<typename T>
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207 struct hash<hb::unique_ptr<T>>
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208 {
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209 std::size_t operator()(const hb::unique_ptr<T>& v) const noexcept
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210 {
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211 std::size_t h = std::hash<decltype (v.get ())>{}(v.get ());
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212 return h;
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213 }
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214 };
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215
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216
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217 } // namespace std
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218
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219 #endif /* __cplusplus */
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220
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221 #endif /* HB_CPLUSPLUS_HH */