30 #ifndef _GLIBCXX_CONCEPTS
31 #define _GLIBCXX_CONCEPTS 1
33 #if __cplusplus > 201703L && __cpp_concepts >= 201907L
35 #pragma GCC system_header
44 #include <type_traits>
46 namespace std _GLIBCXX_VISIBILITY(default)
48 _GLIBCXX_BEGIN_NAMESPACE_VERSION
50 #define __cpp_lib_concepts 202002L
56 template<
typename _Tp,
typename _Up>
57 concept __same_as = std::is_same_v<_Tp, _Up>;
61 template<
typename _Tp,
typename _Up>
63 = __detail::__same_as<_Tp, _Up> && __detail::__same_as<_Up, _Tp>;
66 template<
typename _Derived,
typename _Base>
67 concept derived_from = __is_base_of(_Base, _Derived)
68 && is_convertible_v<const volatile _Derived*, const volatile _Base*>;
71 template<
typename _From,
typename _To>
72 concept convertible_to = is_convertible_v<_From, _To>
73 && requires {
static_cast<_To
>(std::declval<_From>()); };
76 template<
typename _Tp,
typename _Up>
77 concept common_reference_with
78 = same_as<common_reference_t<_Tp, _Up>, common_reference_t<_Up, _Tp>>
79 && convertible_to<_Tp, common_reference_t<_Tp, _Up>>
80 && convertible_to<_Up, common_reference_t<_Tp, _Up>>;
83 template<
typename _Tp,
typename _Up>
85 = same_as<common_type_t<_Tp, _Up>, common_type_t<_Up, _Tp>>
87 static_cast<common_type_t<_Tp, _Up>
>(std::declval<_Tp>());
88 static_cast<common_type_t<_Tp, _Up>
>(std::declval<_Up>());
90 && common_reference_with<add_lvalue_reference_t<const _Tp>,
91 add_lvalue_reference_t<const _Up>>
92 && common_reference_with<add_lvalue_reference_t<common_type_t<_Tp, _Up>>,
94 add_lvalue_reference_t<const _Tp>,
95 add_lvalue_reference_t<const _Up>>>;
99 template<
typename _Tp>
100 concept integral = is_integral_v<_Tp>;
102 template<
typename _Tp>
103 concept signed_integral = integral<_Tp> && is_signed_v<_Tp>;
105 template<
typename _Tp>
106 concept unsigned_integral = integral<_Tp> && !signed_integral<_Tp>;
108 template<
typename _Tp>
109 concept floating_point = is_floating_point_v<_Tp>;
113 template<
typename _Tp>
114 using __cref =
const remove_reference_t<_Tp>&;
116 template<
typename _Tp>
117 concept __class_or_enum
118 = is_class_v<_Tp> || is_union_v<_Tp> || is_enum_v<_Tp>;
122 template<
typename _Lhs,
typename _Rhs>
123 concept assignable_from
124 = is_lvalue_reference_v<_Lhs>
125 && common_reference_with<__detail::__cref<_Lhs>, __detail::__cref<_Rhs>>
126 && requires(_Lhs __lhs, _Rhs&& __rhs) {
127 { __lhs =
static_cast<_Rhs&&
>(__rhs) } -> same_as<_Lhs>;
131 template<
typename _Tp>
132 concept destructible = is_nothrow_destructible_v<_Tp>;
135 template<
typename _Tp,
typename... _Args>
136 concept constructible_from
137 = destructible<_Tp> && is_constructible_v<_Tp, _Args...>;
140 template<
typename _Tp>
141 concept default_initializable = constructible_from<_Tp>
149 template<
typename _Tp>
150 concept move_constructible
151 = constructible_from<_Tp, _Tp> && convertible_to<_Tp, _Tp>;
154 template<
typename _Tp>
155 concept copy_constructible
156 = move_constructible<_Tp>
157 && constructible_from<_Tp, _Tp&> && convertible_to<_Tp&, _Tp>
158 && constructible_from<_Tp, const _Tp&> && convertible_to<const _Tp&, _Tp>
159 && constructible_from<_Tp, const _Tp> && convertible_to<const _Tp, _Tp>;
165 namespace __cust_swap
167 template<
typename _Tp>
void swap(_Tp&, _Tp&) =
delete;
169 template<
typename _Tp,
typename _Up>
171 = (__detail::__class_or_enum<remove_reference_t<_Tp>>
172 || __detail::__class_or_enum<remove_reference_t<_Up>>)
173 && requires(_Tp&& __t, _Up&& __u) {
174 swap(
static_cast<_Tp&&
>(__t),
static_cast<_Up&&
>(__u));
180 template<
typename _Tp,
typename _Up>
181 static constexpr
bool
184 if constexpr (__adl_swap<_Tp, _Up>)
185 return noexcept(swap(std::declval<_Tp>(), std::declval<_Up>()));
187 return is_nothrow_move_constructible_v<remove_reference_t<_Tp>>
188 && is_nothrow_move_assignable_v<remove_reference_t<_Tp>>;
192 template<
typename _Tp,
typename _Up>
193 requires __adl_swap<_Tp, _Up>
194 || (same_as<_Tp, _Up> && is_lvalue_reference_v<_Tp>
195 && move_constructible<remove_reference_t<_Tp>>
196 && assignable_from<_Tp, remove_reference_t<_Tp>>)
198 operator()(_Tp&& __t, _Up&& __u)
const
199 noexcept(_S_noexcept<_Tp, _Up>())
201 if constexpr (__adl_swap<_Tp, _Up>)
202 swap(
static_cast<_Tp&&
>(__t),
static_cast<_Up&&
>(__u));
205 auto __tmp =
static_cast<remove_reference_t<_Tp>&&
>(__t);
206 __t =
static_cast<remove_reference_t<_Tp>&&
>(__u);
207 __u =
static_cast<remove_reference_t<_Tp>&&
>(__tmp);
211 template<
typename _Tp,
typename _Up,
size_t _Num>
212 requires requires(
const _Swap& __swap, _Tp& __e1, _Up& __e2) {
216 operator()(_Tp (&__e1)[_Num], _Up (&__e2)[_Num])
const
217 noexcept(noexcept(std::declval<const _Swap&>()(*__e1, *__e2)))
219 for (
size_t __n = 0; __n < _Num; ++__n)
220 (*
this)(__e1[__n], __e2[__n]);
225 inline namespace __cust
227 inline constexpr __cust_swap::_Swap swap{};
231 template<
typename _Tp>
233 = requires(_Tp& __a, _Tp& __b) { ranges::swap(__a, __b); };
235 template<
typename _Tp,
typename _Up>
236 concept swappable_with = common_reference_with<_Tp, _Up>
237 && requires(_Tp&& __t, _Up&& __u) {
238 ranges::swap(
static_cast<_Tp&&
>(__t),
static_cast<_Tp&&
>(__t));
239 ranges::swap(
static_cast<_Up&&
>(__u),
static_cast<_Up&&
>(__u));
240 ranges::swap(
static_cast<_Tp&&
>(__t),
static_cast<_Up&&
>(__u));
241 ranges::swap(
static_cast<_Up&&
>(__u),
static_cast<_Tp&&
>(__t));
246 template<
typename _Tp>
247 concept movable = is_object_v<_Tp> && move_constructible<_Tp>
248 && assignable_from<_Tp&, _Tp> && swappable<_Tp>;
250 template<
typename _Tp>
251 concept copyable = copy_constructible<_Tp> && movable<_Tp>
252 && assignable_from<_Tp&, _Tp&> && assignable_from<_Tp&, const _Tp&>
253 && assignable_from<_Tp&, const _Tp>;
255 template<
typename _Tp>
256 concept semiregular = copyable<_Tp> && default_initializable<_Tp>;
263 template<
typename _Tp>
264 concept __boolean_testable_impl = convertible_to<_Tp, bool>;
266 template<
typename _Tp>
267 concept __boolean_testable
268 = __boolean_testable_impl<_Tp>
269 && requires(_Tp&& __t)
270 { { !
static_cast<_Tp&&
>(__t) } -> __boolean_testable_impl; };
277 template<
typename _Tp,
typename _Up>
278 concept __weakly_eq_cmp_with
279 = requires(__detail::__cref<_Tp> __t, __detail::__cref<_Up> __u) {
280 { __t == __u } -> __boolean_testable;
281 { __t != __u } -> __boolean_testable;
282 { __u == __t } -> __boolean_testable;
283 { __u != __t } -> __boolean_testable;
287 template<
typename _Tp>
288 concept equality_comparable = __detail::__weakly_eq_cmp_with<_Tp, _Tp>;
290 template<
typename _Tp,
typename _Up>
291 concept equality_comparable_with
292 = equality_comparable<_Tp> && equality_comparable<_Up>
293 && common_reference_with<__detail::__cref<_Tp>, __detail::__cref<_Up>>
294 && equality_comparable<common_reference_t<__detail::__cref<_Tp>,
295 __detail::__cref<_Up>>>
296 && __detail::__weakly_eq_cmp_with<_Tp, _Up>;
300 template<
typename _Tp,
typename _Up>
301 concept __partially_ordered_with
302 = requires(
const remove_reference_t<_Tp>& __t,
303 const remove_reference_t<_Up>& __u) {
304 { __t < __u } -> __boolean_testable;
305 { __t > __u } -> __boolean_testable;
306 { __t <= __u } -> __boolean_testable;
307 { __t >= __u } -> __boolean_testable;
308 { __u < __t } -> __boolean_testable;
309 { __u > __t } -> __boolean_testable;
310 { __u <= __t } -> __boolean_testable;
311 { __u >= __t } -> __boolean_testable;
316 template<
typename _Tp>
317 concept totally_ordered
318 = equality_comparable<_Tp>
319 && __detail::__partially_ordered_with<_Tp, _Tp>;
321 template<
typename _Tp,
typename _Up>
322 concept totally_ordered_with
323 = totally_ordered<_Tp> && totally_ordered<_Up>
324 && equality_comparable_with<_Tp, _Up>
325 && totally_ordered<common_reference_t<__detail::__cref<_Tp>,
326 __detail::__cref<_Up>>>
327 && __detail::__partially_ordered_with<_Tp, _Up>;
329 template<
typename _Tp>
330 concept regular = semiregular<_Tp> && equality_comparable<_Tp>;
335 template<
typename _Fn,
typename... _Args>
336 concept invocable = is_invocable_v<_Fn, _Args...>;
339 template<
typename _Fn,
typename... _Args>
340 concept regular_invocable = invocable<_Fn, _Args...>;
343 template<
typename _Fn,
typename... _Args>
344 concept predicate = regular_invocable<_Fn, _Args...>
345 && __detail::__boolean_testable<invoke_result_t<_Fn, _Args...>>;
348 template<
typename _Rel,
typename _Tp,
typename _Up>
350 = predicate<_Rel, _Tp, _Tp> && predicate<_Rel, _Up, _Up>
351 && predicate<_Rel, _Tp, _Up> && predicate<_Rel, _Up, _Tp>;
354 template<
typename _Rel,
typename _Tp,
typename _Up>
355 concept equivalence_relation = relation<_Rel, _Tp, _Up>;
358 template<
typename _Rel,
typename _Tp,
typename _Up>
359 concept strict_weak_order = relation<_Rel, _Tp, _Up>;
361 _GLIBCXX_END_NAMESPACE_VERSION
ISO C++ entities toplevel namespace is std.