C++ å‚考手册
- C++11
- C++14
- C++17
- C++20
- C++ 编译器支æŒæƒ…况表
- 独立与宿主实现
- C++ è¯è¨€
- C++ 关键è¯
- 预处ç†å™¨
- C++ æ ‡å‡†åº“å¤´æ–‡ä»¶
- å…·åè¦æ±‚
- 功能特性测试 (C++20)
- 工具库
- 类型支æŒï¼ˆåŸºæœ¬ç±»åž‹ã€RTTIã€ç±»åž‹ç‰¹æ€§ï¼‰
- 概念库 (C++20)
- 错误处ç†
- 动æ€å†…å˜ç®¡ç†
- std::unique_ptr
- std::make_unique, std::make_unique_for_overwrite
- std::hash <std::unique_ptr>
- std::unique_ptr<T,Deleter>::operator<<
- std::swap(std::unique_ptr)
- std::unique_ptr<T,Deleter>::operator*
- std::unique_ptr<T,Deleter>::operator[]
- operator==,!=,<,<=,>,>=,<=>(std::unique_ptr)
- std::unique_ptr<T,Deleter>::get
- std::unique_ptr<T,Deleter>::get_deleter
- std::unique_ptr<T,Deleter>::operator bool
- std::unique_ptr<T,Deleter>::reset
- std::unique_ptr<T,Deleter>::swap
- std::unique_ptr<T,Deleter>::operator=
- std::unique_ptr<T,Deleter>::release
- std::unique_ptr<T,Deleter>::unique_ptr
- std::unique_ptr<T,Deleter>::~unique_ptr
- std::addressof
- std::allocator_traits
- std::default_delete
- std::allocator_arg_t
- std::allocator_arg
- std::weak_ptr
- std::enable_shared_from_this
- std::bad_weak_ptr
- std::scoped_allocator_adaptor
- std::auto_ptr
- std::destroy_at
- std::destroy
- std::destroy_n
- std::uninitialized_move
- std::uninitialized_value_construct
- std::owner_less
- std::shared_ptr
- std::to_address
- std::assume_aligned
- std::make_obj_using_allocator
- C 内å˜ç®¡ç†åº“
- 低层内å˜ç®¡ç†
- std::pmr::memory_resource
- std::allocator
- std::pointer_traits
- std::uses_allocator
- std::uses_allocator_construction_args
- std::uninitialized_construct_using_allocator
- std::pmr::polymorphic_allocator
- std::pmr::get_default_resource
- std::pmr::set_default_resource
- std::pmr::new_delete_resource
- std::pmr::null_memory_resource
- std::pmr::synchronized_pool_resource
- std::pmr::unsynchronized_pool_resource
- std::pmr::monotonic_buffer_resource
- std::pmr::pool_options
- std::raw_storage_iterator
- std::get_temporary_buffer
- std::return_temporary_buffer
- std::uninitialized_copy
- std::uninitialized_fill
- std::uninitialized_default_construct
- std::uninitialized_copy_n
- std::uninitialized_fill_n
- std::uninitialized_move_n
- std::uninitialized_default_construct_n
- std::uninitialized_value_construct_n
- std::construct_at
- std::align
- 注释
- 日期和时间工具
- å—符串库
- 容器库
- è¿ä»£å™¨åº“
- 范围库 (C++20)
- 算法库
- 数值库
- 输入/输出库
- 文件系统库
- 本地化库
- æ£åˆ™è¡¨è¾¾å¼åº“
- 原åæ“作库
- 线程支æŒåº“
- 实验性 C++ 特性
- 有用的资æº
- 索引
- std 符å·ç´¢å¼•
- åç¨‹æ”¯æŒ (C++20)
- C++ 关键è¯
ä½ç½®ï¼šé¦–页 > C++ å‚考手册 >动æ€å†…å˜ç®¡ç† >std::unique_ptr > operator==,!=,<,<=,>,>=,<=>(std::unique_ptr)
operator==,!=,<,<=,>,>=,<=>(std::unique_ptr)
  requires std::three_way_comparable_with<
    typename unique_ptr<T1, D1>::pointer,
    typename unique_ptr<T2, D2>::pointer>
std::compare_three_way_result_t<typename unique_ptr<T1, D1>::pointer,
                typename unique_ptr<T2, D2>::pointer>
template <class T, class D>
bool operator==(const unique_ptr<T, D>& x, std::nullptr_t) noexcept;
bool operator==(const unique_ptr<T, D>& x, std::nullptr_t) noexcept;
template <class T, class D>
bool operator==(std::nullptr_t, const unique_ptr<T, D>& x) noexcept;
bool operator==(std::nullptr_t, const unique_ptr<T, D>& x) noexcept;
(C++20 å‰)
template <class T, class D>
bool operator!=(const unique_ptr<T, D>& x, std::nullptr_t) noexcept;
bool operator!=(const unique_ptr<T, D>& x, std::nullptr_t) noexcept;
(C++20 å‰)
template <class T, class D>
bool operator!=(std::nullptr_t, const unique_ptr<T, D>& x) noexcept;
bool operator!=(std::nullptr_t, const unique_ptr<T, D>& x) noexcept;
(C++20 å‰)
template <class T, class D>
bool operator<(const unique_ptr<T, D>& x, std::nullptr_t);
bool operator<(const unique_ptr<T, D>& x, std::nullptr_t);
template <class T, class D>
bool operator<(std::nullptr_t, const unique_ptr<T, D>& y);
bool operator<(std::nullptr_t, const unique_ptr<T, D>& y);
template <class T, class D>
bool operator<=(const unique_ptr<T, D>& x, std::nullptr_t);
bool operator<=(const unique_ptr<T, D>& x, std::nullptr_t);
template <class T, class D>
bool operator<=(std::nullptr_t, const unique_ptr<T, D>& y);
bool operator<=(std::nullptr_t, const unique_ptr<T, D>& y);
template <class T, class D>
bool operator>(const unique_ptr<T, D>& x, std::nullptr_t);
bool operator>(const unique_ptr<T, D>& x, std::nullptr_t);
template <class T, class D>
bool operator>(std::nullptr_t, const unique_ptr<T, D>& y);
bool operator>(std::nullptr_t, const unique_ptr<T, D>& y);
template <class T, class D>
bool operator>=(const unique_ptr<T, D>& x, std::nullptr_t);
bool operator>=(const unique_ptr<T, D>& x, std::nullptr_t);
template <class T, class D>
bool operator>=(std::nullptr_t, const unique_ptr<T, D>& y);
bool operator>=(std::nullptr_t, const unique_ptr<T, D>& y);
template<class T, class D>
  requires std::three_way_comparable_with<
    typename unique_ptr<T, D>::pointer,
    std::nullptr_t>
std::compare_three_way_result_t<typename unique_ptr<T, D>::pointer,
                std::nullptr_t>
比较二个 unique_ptr 或 unique_ptr 与 nullptr 的指针值。
1-7) 比较二个
unique_ptr 。8-20) 比较
unique_ptr 与 nullptr 。å‚æ•°
| x, y | - | è¦æ¯”较的 unique_ptr
|
返回值
1) x.get() == y.get()
2) x.get() != y.get()
3) std::less<CT>()(x.get(), y.get()) ，其ä¸
CT 是 std::common_type<unique_ptr<T1, D1>::pointer, unique_ptr<T2, D2>::pointer>::type4) !(y < x)
5) y < x
6) !(x < y)
7) std::compare_three_way{}(x.get(), y.get())
8-9) !x
10-11) (bool)x
12) std::less<unique_ptr<T,D>::pointer>()(x.get(), nullptr)
13) std::less<unique_ptr<T,D>::pointer>()(nullptr, y.get())
14) !(nullptr < x)
15) !(y < nullptr)
16) nullptr < x
17) y < nullptr
18) !(x < nullptr)
19) !(nullptr < y)
20) std::compare_three_way{}(x.get(), nullptr)
示例
è¿è¡Œæ¤ä»£ç
#include <iostream> #include <memory>  int main() { std::unique_ptr<int> p1(new int(42)); std::unique_ptr<int> p2(new int(42));  std::cout << "p1 == p1: " << (p1 == p1) << '\n';  // p1 与 p2 指å‘ä¸åŒå†…å˜ä½ç½®ï¼Œæ•… p1 != p2 std::cout << "p1 == p2: " << (p1 == p2) << '\n'; }
输出：
p1 == p1: 1 p1 == p2: 0
å‚阅
| 返回指å‘被管ç†å¯¹è±¡çš„指针 (公开æˆå‘˜å‡½æ•°) |