22 Containers library [containers]

22.2 Container requirements [container.requirements]

22.2.4 Node handles [container.node]

22.2.4.4 Observers [container.node.observers]

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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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mapped_type& mapped() const;
8
#
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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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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explicit operator bool() const noexcept;
14
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Returns: ptr_­ != nullptr.
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[[nodiscard]] bool empty() const noexcept;
15
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Returns: ptr_­ == nullptr.