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comparison 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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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /*
2 * Copyright © 2018 Google, Inc.
3 *
4 * This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Google Author(s): Behdad Esfahbod
25 */
26
27 #ifndef HB_META_HH
28 #define HB_META_HH
29
30 #include "hb.hh"
31
32 #include <memory>
33 #include <type_traits>
34 #include <utility>
35
36
37 /*
38 * C++ template meta-programming & fundamentals used with them.
39 */
40
41 /* Void! For when we need a expression-type of void. */
42 struct hb_empty_t {};
43
44 /* https://en.cppreference.com/w/cpp/types/void_t */
45 template<typename... Ts> struct _hb_void_t { typedef void type; };
46 template<typename... Ts> using hb_void_t = typename _hb_void_t<Ts...>::type;
47
48 template<typename Head, typename... Ts> struct _hb_head_t { typedef Head type; };
49 template<typename... Ts> using hb_head_t = typename _hb_head_t<Ts...>::type;
50
51 template <typename T, T v> struct hb_integral_constant { static constexpr T value = v; };
52 template <bool b> using hb_bool_constant = hb_integral_constant<bool, b>;
53 using hb_true_type = hb_bool_constant<true>;
54 using hb_false_type = hb_bool_constant<false>;
55
56 /* Static-assert as expression. */
57 template <bool cond> struct static_assert_expr;
58 template <> struct static_assert_expr<true> : hb_false_type {};
59 #define static_assert_expr(C) static_assert_expr<C>::value
60
61 /* Basic type SFINAE. */
62
63 template <bool B, typename T = void> struct hb_enable_if {};
64 template <typename T> struct hb_enable_if<true, T> { typedef T type; };
65 #define hb_enable_if(Cond) typename hb_enable_if<(Cond)>::type* = nullptr
66 /* Concepts/Requires alias: */
67 #define hb_requires(Cond) hb_enable_if((Cond))
68
69 template <typename T, typename T2> struct hb_is_same : hb_false_type {};
70 template <typename T> struct hb_is_same<T, T> : hb_true_type {};
71 #define hb_is_same(T, T2) hb_is_same<T, T2>::value
72
73 /* Function overloading SFINAE and priority. */
74
75 #define HB_RETURN(Ret, E) -> hb_head_t<Ret, decltype ((E))> { return (E); }
76 #define HB_AUTO_RETURN(E) -> decltype ((E)) { return (E); }
77 #define HB_VOID_RETURN(E) -> hb_void_t<decltype ((E))> { (E); }
78
79 template <unsigned Pri> struct hb_priority : hb_priority<Pri - 1> {};
80 template <> struct hb_priority<0> {};
81 #define hb_prioritize hb_priority<16> ()
82
83 #define HB_FUNCOBJ(x) static_const x HB_UNUSED
84
85
86 template <typename T> struct hb_type_identity_t { typedef T type; };
87 template <typename T> using hb_type_identity = typename hb_type_identity_t<T>::type;
88
89 template <typename T> static inline T hb_declval ();
90 #define hb_declval(T) (hb_declval<T> ())
91
92 template <typename T> struct hb_match_const : hb_type_identity_t<T>, hb_false_type {};
93 template <typename T> struct hb_match_const<const T> : hb_type_identity_t<T>, hb_true_type {};
94 template <typename T> using hb_remove_const = typename hb_match_const<T>::type;
95
96 template <typename T> struct hb_match_reference : hb_type_identity_t<T>, hb_false_type {};
97 template <typename T> struct hb_match_reference<T &> : hb_type_identity_t<T>, hb_true_type {};
98 template <typename T> struct hb_match_reference<T &&> : hb_type_identity_t<T>, hb_true_type {};
99 template <typename T> using hb_remove_reference = typename hb_match_reference<T>::type;
100 template <typename T> auto _hb_try_add_lvalue_reference (hb_priority<1>) -> hb_type_identity<T&>;
101 template <typename T> auto _hb_try_add_lvalue_reference (hb_priority<0>) -> hb_type_identity<T>;
102 template <typename T> using hb_add_lvalue_reference = decltype (_hb_try_add_lvalue_reference<T> (hb_prioritize));
103 template <typename T> auto _hb_try_add_rvalue_reference (hb_priority<1>) -> hb_type_identity<T&&>;
104 template <typename T> auto _hb_try_add_rvalue_reference (hb_priority<0>) -> hb_type_identity<T>;
105 template <typename T> using hb_add_rvalue_reference = decltype (_hb_try_add_rvalue_reference<T> (hb_prioritize));
106
107 template <typename T> struct hb_match_pointer : hb_type_identity_t<T>, hb_false_type {};
108 template <typename T> struct hb_match_pointer<T *> : hb_type_identity_t<T>, hb_true_type {};
109 template <typename T> using hb_remove_pointer = typename hb_match_pointer<T>::type;
110 template <typename T> auto _hb_try_add_pointer (hb_priority<1>) -> hb_type_identity<hb_remove_reference<T>*>;
111 template <typename T> auto _hb_try_add_pointer (hb_priority<1>) -> hb_type_identity<T>;
112 template <typename T> using hb_add_pointer = decltype (_hb_try_add_pointer<T> (hb_prioritize));
113
114
115 template <typename T> using hb_decay = typename std::decay<T>::type;
116
117 #define hb_is_convertible(From,To) std::is_convertible<From, To>::value
118
119 template <typename From, typename To>
120 using hb_is_cr_convertible = hb_bool_constant<
121 hb_is_same (hb_decay<From>, hb_decay<To>) &&
122 (!std::is_const<From>::value || std::is_const<To>::value) &&
123 (!std::is_reference<To>::value || std::is_const<To>::value || std::is_reference<To>::value)
124 >;
125 #define hb_is_cr_convertible(From,To) hb_is_cr_convertible<From, To>::value
126
127
128 struct
129 {
130 template <typename T> constexpr auto
131 operator () (T&& v) const HB_AUTO_RETURN (std::forward<T> (v))
132
133 template <typename T> constexpr auto
134 operator () (T *v) const HB_AUTO_RETURN (*v)
135
136 template <typename T> constexpr auto
137 operator () (const hb::shared_ptr<T>& v) const HB_AUTO_RETURN (*v)
138
139 template <typename T> constexpr auto
140 operator () (hb::shared_ptr<T>& v) const HB_AUTO_RETURN (*v)
141
142 template <typename T> constexpr auto
143 operator () (const hb::unique_ptr<T>& v) const HB_AUTO_RETURN (*v)
144
145 template <typename T> constexpr auto
146 operator () (hb::unique_ptr<T>& v) const HB_AUTO_RETURN (*v)
147 }
148 HB_FUNCOBJ (hb_deref);
149
150 template <typename T>
151 struct hb_reference_wrapper
152 {
153 hb_reference_wrapper (T v) : v (v) {}
154 bool operator == (const hb_reference_wrapper& o) const { return v == o.v; }
155 bool operator != (const hb_reference_wrapper& o) const { return v != o.v; }
156 operator T () const { return v; }
157 T get () const { return v; }
158 T v;
159 };
160 template <typename T>
161 struct hb_reference_wrapper<T&>
162 {
163 hb_reference_wrapper (T& v) : v (std::addressof (v)) {}
164 bool operator == (const hb_reference_wrapper& o) const { return v == o.v; }
165 bool operator != (const hb_reference_wrapper& o) const { return v != o.v; }
166 operator T& () const { return *v; }
167 T& get () const { return *v; }
168 T* v;
169 };
170
171
172 /* Type traits */
173
174 template <typename T> struct hb_int_min;
175 template <> struct hb_int_min<char> : hb_integral_constant<char, CHAR_MIN> {};
176 template <> struct hb_int_min<signed char> : hb_integral_constant<signed char, SCHAR_MIN> {};
177 template <> struct hb_int_min<unsigned char> : hb_integral_constant<unsigned char, 0> {};
178 template <> struct hb_int_min<signed short> : hb_integral_constant<signed short, SHRT_MIN> {};
179 template <> struct hb_int_min<unsigned short> : hb_integral_constant<unsigned short, 0> {};
180 template <> struct hb_int_min<signed int> : hb_integral_constant<signed int, INT_MIN> {};
181 template <> struct hb_int_min<unsigned int> : hb_integral_constant<unsigned int, 0> {};
182 template <> struct hb_int_min<signed long> : hb_integral_constant<signed long, LONG_MIN> {};
183 template <> struct hb_int_min<unsigned long> : hb_integral_constant<unsigned long, 0> {};
184 template <> struct hb_int_min<signed long long> : hb_integral_constant<signed long long, LLONG_MIN> {};
185 template <> struct hb_int_min<unsigned long long> : hb_integral_constant<unsigned long long, 0> {};
186 template <typename T> struct hb_int_min<T *> : hb_integral_constant<T *, nullptr> {};
187 #define hb_int_min(T) hb_int_min<T>::value
188 template <typename T> struct hb_int_max;
189 template <> struct hb_int_max<char> : hb_integral_constant<char, CHAR_MAX> {};
190 template <> struct hb_int_max<signed char> : hb_integral_constant<signed char, SCHAR_MAX> {};
191 template <> struct hb_int_max<unsigned char> : hb_integral_constant<unsigned char, UCHAR_MAX> {};
192 template <> struct hb_int_max<signed short> : hb_integral_constant<signed short, SHRT_MAX> {};
193 template <> struct hb_int_max<unsigned short> : hb_integral_constant<unsigned short, USHRT_MAX> {};
194 template <> struct hb_int_max<signed int> : hb_integral_constant<signed int, INT_MAX> {};
195 template <> struct hb_int_max<unsigned int> : hb_integral_constant<unsigned int, UINT_MAX> {};
196 template <> struct hb_int_max<signed long> : hb_integral_constant<signed long, LONG_MAX> {};
197 template <> struct hb_int_max<unsigned long> : hb_integral_constant<unsigned long, ULONG_MAX> {};
198 template <> struct hb_int_max<signed long long> : hb_integral_constant<signed long long, LLONG_MAX> {};
199 template <> struct hb_int_max<unsigned long long> : hb_integral_constant<unsigned long long, ULLONG_MAX> {};
200 #define hb_int_max(T) hb_int_max<T>::value
201
202 #if defined(__GNUC__) && __GNUC__ < 5 && !defined(__clang__)
203 #define hb_is_trivially_copyable(T) __has_trivial_copy(T)
204 #define hb_is_trivially_copy_assignable(T) __has_trivial_assign(T)
205 #define hb_is_trivially_constructible(T) __has_trivial_constructor(T)
206 #define hb_is_trivially_copy_constructible(T) __has_trivial_copy_constructor(T)
207 #define hb_is_trivially_destructible(T) __has_trivial_destructor(T)
208 #else
209 #define hb_is_trivially_copyable(T) std::is_trivially_copyable<T>::value
210 #define hb_is_trivially_copy_assignable(T) std::is_trivially_copy_assignable<T>::value
211 #define hb_is_trivially_constructible(T) std::is_trivially_constructible<T>::value
212 #define hb_is_trivially_copy_constructible(T) std::is_trivially_copy_constructible<T>::value
213 #define hb_is_trivially_destructible(T) std::is_trivially_destructible<T>::value
214 #endif
215
216 /* Class traits. */
217
218 #define HB_DELETE_COPY_ASSIGN(TypeName) \
219 TypeName(const TypeName&) = delete; \
220 void operator=(const TypeName&) = delete
221 #define HB_DELETE_CREATE_COPY_ASSIGN(TypeName) \
222 TypeName() = delete; \
223 TypeName(const TypeName&) = delete; \
224 void operator=(const TypeName&) = delete
225
226 /* hb_unwrap_type (T)
227 * If T has no T::type, returns T. Otherwise calls itself on T::type recursively.
228 */
229
230 template <typename T, typename>
231 struct _hb_unwrap_type : hb_type_identity_t<T> {};
232 template <typename T>
233 struct _hb_unwrap_type<T, hb_void_t<typename T::type>> : _hb_unwrap_type<typename T::type, void> {};
234 template <typename T>
235 using hb_unwrap_type = _hb_unwrap_type<T, void>;
236 #define hb_unwrap_type(T) typename hb_unwrap_type<T>::type
237
238 #endif /* HB_META_HH */