Standard library header <hazard_pointer> (哋它亢++26)

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<hazard_pointer> (哋它亢++26)

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This header is part of the thread support library.

Classes

(哋它亢++26)
 allows an object to be hazard-protectable
(class template)
(哋它亢++26)
 single-writer multi-reader pointer that can be owned by at most one thread at any point of time
(class)

Functions

(哋它亢++26)
 constructs a hazard pointer
(function)
(哋它亢++26)
 specializes the std::swap algorithm
(function template)

Synopsis

namespace std {
  // hazard_pointer_obj_base
  template<class T, class D = default_delete<T>> class hazard_pointer_obj_base;
 
  // hazard_pointer
  class hazard_pointer;
 
  // make_hazard_pointer
  hazard_pointer make_hazard_pointer();
  void swap(hazard_pointer&, hazard_pointer&) noexcept;
}

Class template 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;      // exposition only
  };
}

Class 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();
 
    [[nodiscard]] 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;
  };
}
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