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< title > Writable Iterator Concept</ title >
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< h1 class = "title" > Writable Iterator Concept</ h1 >
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<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
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< p > A class or built-in type < tt class = "docutils literal" >< span class = "pre" > X</ span ></ tt > models the < em > Writable 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. Writable
Iterators have an associated < em > set of value types</ em > .</ p >
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< tr >< th class = "head" colspan = "3" > Writable 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" > Precondition</ th >
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< tr >< td >< tt class = "docutils literal" >< span class = "pre" > *a</ span > < span class = "pre" > =</ span > < span class = "pre" > o</ span ></ tt ></ td >
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< td > </ td >
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< td > pre: The type of < tt class = "docutils literal" >< span class = "pre" > o</ span ></ tt >
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is in the set of
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value types of < tt class = "docutils literal" >< span class = "pre" > X</ span ></ tt ></ td >
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