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Swappable Iterator Concept
..........................
A class or built-in type ``X`` models the *Swappable Iterator* concept
if, in addition to ``X`` being Copy Constructible, the following
expressions are valid and respect the stated semantics.
+---------------------------------------------------------------------+
|Swappable Iterator Requirements (in addition to Copy Constructible) |
+-------------------------+-------------+-----------------------------+
|Expression |Return Type |Postcondition |
+=========================+=============+=============================+
|``iter_swap(a, b)`` |``void`` |the pointed to values are |
| | |exchanged |
+-------------------------+-------------+-----------------------------+
[*Note:* An iterator that is a model of the *Readable* and *Writable Iterator* concepts
is also a model of *Swappable Iterator*. *--end note*]
|
