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Standard library header <hazard_pointer> (C++26)

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C++
Standard library headers

此头文件是 线程支持 库的组成部分。

目录

类

(C++26)
允许对象具备危险指针保护能力
(类模板)
(C++26)
单写者多读者指针，任意时刻最多只能被一个线程持有
(类)

函数

(C++26)
构造危险指针
(函数)
(C++26)
特化 std::swap 算法
(函数模板)

概要 

namespace std {
  // 危险指针对象基类
  template<class T, class D = default_delete<T>> class hazard_pointer_obj_base;
  // 危险指针
  class hazard_pointer;
  // 创建危险指针
  hazard_pointer make_hazard_pointer();
  void swap(hazard_pointer&, hazard_pointer&) noexcept;
}

类模板 std::hazard_pointer_obj_base 

namespace std {
  template<class T, class D = default_delete<T>>
  class hazard_pointer_obj_base {
  public:
    void retire(D d = D()) noexcept;
  protected:
    hazard_pointer_obj_base() = default;
    hazard_pointer_obj_base(const hazard_pointer_obj_base&) = default;
    hazard_pointer_obj_base(hazard_pointer_obj_base&&) = default;
    hazard_pointer_obj_base& operator=(const hazard_pointer_obj_base&) = default;
    hazard_pointer_obj_base& operator=(hazard_pointer_obj_base&&) = default;
    ~hazard_pointer_obj_base() = default;
  private:
    D deleter;      // 仅用于说明
  };
}

类 std::hazard_pointer 

namespace std {
  class hazard_pointer {
  public:
    hazard_pointer() noexcept;
    hazard_pointer(hazard_pointer&&) noexcept;
    hazard_pointer& operator=(hazard_pointer&&) noexcept;
    ~hazard_pointer();
    bool empty() const noexcept;
    template<class T> T* protect(const atomic<T*>& src) noexcept;
    template<class T> bool try_protect(T*& ptr, const atomic<T*>& src) noexcept;
    template<class T> void reset_protection(const T* ptr) noexcept;
    void reset_protection(nullptr_t = nullptr) noexcept;
    void swap(hazard_pointer&) noexcept;
  };
}