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< title > Swappable Iterator Concept</ title >
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< h1 class = "title" > Swappable Iterator Concept</ h1 >
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<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
<!-- Software License, Version 1.0. (See accompanying -->
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< p > A class or built-in type < tt class = "docutils literal" >< span class = "pre" > X</ span ></ tt > models the < em > Swappable Iterator</ em > concept
if, in addition to < tt class = "docutils literal" >< span class = "pre" > X</ span ></ tt > being Copy Constructible, the following
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expressions are valid and respect the stated semantics.</ p >
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< tr >< th class = "head" colspan = "3" > Swappable Iterator Requirements (in addition to Copy Constructible)</ th >
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</ tr >
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< tr >< th class = "head" > Expression</ th >
< th class = "head" > Return Type</ th >
< th class = "head" > Postcondition</ th >
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< tr >< td >< tt class = "docutils literal" >< span class = "pre" > iter_swap(a,</ span > < span class = "pre" > b)</ span ></ tt ></ td >
< td >< tt class = "docutils literal" >< span class = "pre" > void</ span ></ tt ></ td >
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< td > the pointed to values are
exchanged</ td >
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< dt > [< em > Note:</ em > An iterator that is a model of the < em > Readable</ em > and < em > Writable Iterator</ em > concepts</ dt >
< dd > is also a model of < em > Swappable Iterator</ em > . < em > --end note</ em > ]</ dd >
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