33 #ifndef _GLIBCXX_EXPERIMENTAL_MEMORY
34 #define _GLIBCXX_EXPERIMENTAL_MEMORY 1
36 #pragma GCC system_header
38 #if __cplusplus <= 201103L
48 namespace std _GLIBCXX_VISIBILITY(default)
50 namespace experimental
52 inline namespace fundamentals_v2
54 _GLIBCXX_BEGIN_NAMESPACE_VERSION
56 #define __cpp_lib_experimental_observer_ptr 201411
58 template <
typename _Tp>
63 using element_type = _Tp;
64 using __pointer = add_pointer_t<_Tp>;
65 using __reference = add_lvalue_reference_t<_Tp>;
69 constexpr observer_ptr() noexcept
74 constexpr observer_ptr(nullptr_t) noexcept
78 constexpr
explicit observer_ptr(__pointer __p) noexcept
83 template <
typename _Up,
84 typename =
typename enable_if<
85 is_convertible<typename add_pointer<_Up>::type, __pointer
88 constexpr observer_ptr(observer_ptr<_Up> __p) noexcept
100 constexpr __reference
107 operator->() const noexcept
112 constexpr
explicit operator bool() const noexcept
114 return get() !=
nullptr;
118 constexpr
explicit operator __pointer() const noexcept
127 __pointer __tmp =
get();
133 reset(__pointer __p =
nullptr) noexcept
139 swap(observer_ptr& __p) noexcept
141 std::swap(__t, __p.__t);
148 template<
typename _Tp>
150 swap(observer_ptr<_Tp>& __p1, observer_ptr<_Tp>& __p2) noexcept
155 template<
typename _Tp>
157 make_observer(_Tp* __p) noexcept
159 return observer_ptr<_Tp>(__p);
162 template<
typename _Tp,
typename _Up>
164 operator==(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
166 return __p1.get() == __p2.get();
169 template<
typename _Tp,
typename _Up>
171 operator!=(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
173 return !(__p1 == __p2);
176 template<
typename _Tp>
178 operator==(observer_ptr<_Tp> __p, nullptr_t) noexcept
183 template<
typename _Tp>
185 operator==(nullptr_t, observer_ptr<_Tp> __p) noexcept
190 template<
typename _Tp>
192 operator!=(observer_ptr<_Tp> __p, nullptr_t) noexcept
197 template<
typename _Tp>
199 operator!=(nullptr_t, observer_ptr<_Tp> __p) noexcept
204 template<
typename _Tp,
typename _Up>
206 operator<(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
209 typename add_pointer<_Up>::type
211 >{}(__p1.get(), __p2.get());
214 template<
typename _Tp,
typename _Up>
216 operator>(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
221 template<
typename _Tp,
typename _Up>
223 operator<=(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
225 return !(__p2 < __p1);
228 template<
typename _Tp,
typename _Up>
230 operator>=(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
232 return !(__p1 < __p2);
235 _GLIBCXX_END_NAMESPACE_VERSION
239 template <
typename _Tp>
240 struct hash<experimental::observer_ptr<_Tp>>
242 using result_type = size_t;
243 using argument_type = experimental::observer_ptr<_Tp>;
246 operator()(
const experimental::observer_ptr<_Tp>& __t)
const
247 noexcept(noexcept(hash<
typename add_pointer<_Tp>::type> {}(__t.get())))
249 return hash<typename add_pointer<_Tp>::type> {}(__t.get());
255 #endif // __cplusplus <= 201103L
257 #endif // _GLIBCXX_EXPERIMENTAL_MEMORY
complex< _Tp > operator*(const complex< _Tp > &__x, const complex< _Tp > &__y)
Return new complex value x times y.
One of the comparison functors.