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[container.node.observers]
23 Containers library [containers]
23.2 Requirements [container.requirements]
23.2.5 Node handles [container.node]
23.2.5.4 Observers [container.node.observers]
constexpr value_type& value() const;
Preconditions: empty() == false.
Returns: A reference to the value_type subobject in thecontainer_node_type object pointed to by ptr_.
Throws: Nothing.
key_type& key() const;
Preconditions: empty() == false.
Returns: A non-const reference to the key_type member of thevalue_type subobject in the container_node_type object pointed to by ptr_.
Throws: Nothing.
Remarks: Modifying the key through the returned reference is permitted.
constexpr mapped_type& mapped() const;
Preconditions: empty() == false.
Returns: A reference to the mapped_type member of thevalue_type subobject in the container_node_type object pointed to by ptr_.
Throws: Nothing.
constexpr allocator_type get_allocator() const;
Preconditions: empty() == false.
Returns: *alloc_.
Throws: Nothing.
constexpr explicit operator bool() const noexcept;
Returns: ptr_ != nullptr.
constexpr bool empty() const noexcept;
Returns: ptr_ == nullptr.