33 #ifndef _GLIBCXX_EXPERIMENTAL_MEMORY
34 #define _GLIBCXX_EXPERIMENTAL_MEMORY 1
36 #pragma GCC system_header
38 #if __cplusplus >= 201402L
46 namespace std _GLIBCXX_VISIBILITY(default)
48 _GLIBCXX_BEGIN_NAMESPACE_VERSION
50 namespace experimental
52 inline namespace fundamentals_v2
54 #define __cpp_lib_experimental_observer_ptr 201411
56 template <
typename _Tp>
61 using element_type = _Tp;
62 using __pointer = add_pointer_t<_Tp>;
63 using __reference = add_lvalue_reference_t<_Tp>;
72 constexpr observer_ptr(nullptr_t)
noexcept
76 constexpr
explicit observer_ptr(__pointer __p)
noexcept
81 template <
typename _Up,
82 typename =
typename enable_if<
83 is_convertible<typename add_pointer<_Up>::type, __pointer
86 constexpr observer_ptr(observer_ptr<_Up> __p)
noexcept
110 constexpr
explicit operator bool() const
noexcept
112 return get() !=
nullptr;
116 constexpr
explicit operator __pointer() const
noexcept
125 __pointer __tmp =
get();
131 reset(__pointer __p =
nullptr)
noexcept
139 std::swap(__t, __p.__t);
146 template<
typename _Tp>
148 swap(observer_ptr<_Tp>& __p1, observer_ptr<_Tp>& __p2)
noexcept
153 template<
typename _Tp>
157 return observer_ptr<_Tp>(__p);
160 template<
typename _Tp,
typename _Up>
162 operator==(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
164 return __p1.get() == __p2.get();
167 template<
typename _Tp,
typename _Up>
169 operator!=(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
171 return !(__p1 == __p2);
174 template<
typename _Tp>
176 operator==(observer_ptr<_Tp> __p, nullptr_t)
noexcept
181 template<
typename _Tp>
183 operator==(nullptr_t, observer_ptr<_Tp> __p)
noexcept
188 template<
typename _Tp>
190 operator!=(observer_ptr<_Tp> __p, nullptr_t)
noexcept
195 template<
typename _Tp>
197 operator!=(nullptr_t, observer_ptr<_Tp> __p)
noexcept
202 template<
typename _Tp,
typename _Up>
204 operator<(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
207 typename add_pointer<_Up>::type
209 >{}(__p1.get(), __p2.get());
212 template<
typename _Tp,
typename _Up>
214 operator>(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
219 template<
typename _Tp,
typename _Up>
221 operator<=(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
223 return !(__p2 < __p1);
226 template<
typename _Tp,
typename _Up>
228 operator>=(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
230 return !(__p1 < __p2);
235 template <
typename _Tp>
236 struct hash<experimental::observer_ptr<_Tp>>
238 using result_type = size_t;
239 using argument_type = experimental::observer_ptr<_Tp>;
242 operator()(
const experimental::observer_ptr<_Tp>& __t)
const
245 return hash<typename add_pointer<_Tp>::type> {}(__t.get());
250 _GLIBCXX_END_NAMESPACE_VERSION
253 #endif // __cplusplus <= 201103L
255 #endif // _GLIBCXX_EXPERIMENTAL_MEMORY
enable_if< ::__array_traits< _Tp, _Nm >::_Is_swappable::value >::type noexcept(noexcept(__one.swap(__two)))
swap
One of the comparison functors.
_GLIBCXX20_CONSTEXPR complex< _Tp > operator*(const complex< _Tp > &__x, const complex< _Tp > &__y)
Return new complex value x times y.