hazard_pointer_domain { public: hazard_pointer_domain() noexcept; explicit hazard_pointer_domain( pmr::polymorphic_allocator poly_alloc) noexcept; hazard_pointer_domain(const hazard_pointer_domain&) = delete; hazard_pointer_domain { public: hazard_pointer_domain() noexcept; explicit hazard_pointer_domain( pmr::polymorphic_allocator poly_alloc) noexcept; hazard_pointer_domain(const hazard_pointer_domain&) = delete;