23 Containers library [containers]

23.2 Requirements [container.requirements]

23.2.5 Node handles [container.node]

23.2.5.4 Observers [container.node.observers]

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constexpr value_type& value() const;
1
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Preconditions: empty() == false.
2
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Returns: A reference to the value_type subobject in the container_node_type object pointed to by ptr_.
3
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Throws: Nothing.
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key_type& key() const;
4
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Preconditions: empty() == false.
5
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Returns: A non-const reference to the key_type member of the value_type subobject in the container_node_type object pointed to by ptr_.
6
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Throws: Nothing.
7
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Remarks: Modifying the key through the returned reference is permitted.
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constexpr mapped_type& mapped() const;
8
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Preconditions: empty() == false.
9
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Returns: A reference to the mapped_type member of the value_type subobject in the container_node_type object pointed to by ptr_.
10
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Throws: Nothing.
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constexpr allocator_type get_allocator() const;
11
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Preconditions: empty() == false.
12
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Returns: *alloc_.
13
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Throws: Nothing.
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constexpr explicit operator bool() const noexcept;
14
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Returns: ptr_ != nullptr.
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constexpr bool empty() const noexcept;
15
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Returns: ptr_ == nullptr.