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< div class = "document" id = "readable-iterator-concept" >
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< h1 class = "title" > Readable Iterator Concept< / h1 >
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
<!-- Software License, Version 1.0. (See accompanying -->
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
< p > A class or built-in type < tt class = "docutils literal" > < span class = "pre" > X< / span > < / tt > models the < em > Readable Iterator< / em > concept
for value type < tt class = "docutils literal" > < span class = "pre" > T< / span > < / tt > if, in addition to < tt class = "docutils literal" > < span class = "pre" > X< / span > < / tt > being Assignable and
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Copy Constructible, the following expressions are valid and respect
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the stated semantics. < tt class = "docutils literal" > < span class = "pre" > U< / span > < / tt > is the type of any specified member of
type < tt class = "docutils literal" > < span class = "pre" > T< / span > < / tt > .< / p >
< table border = "1" class = "docutils" >
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< col width = "20%" / >
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< thead valign = "bottom" >
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< tr > < th class = "head" colspan = "3" > Readable Iterator Requirements (in addition to Assignable and 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" > Note/Precondition< / th >
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< / tr >
< / thead >
< tbody valign = "top" >
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< tr > < td > < tt class = "docutils literal" > < span class = "pre" > iterator_traits< X> ::value_type< / span > < / tt > < / td >
< td > < tt class = "docutils literal" > < span class = "pre" > T< / span > < / tt > < / td >
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< td > Any non-reference,
non-cv-qualified type< / td >
< / tr >
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< tr > < td > < tt class = "docutils literal" > < span class = "pre" > *a< / span > < / tt > < / td >
< td > Convertible to < tt class = "docutils literal" > < span class = "pre" > T< / span > < / tt > < / td >
< td > < dl class = "first last docutils" >
< dt > pre: < tt class = "docutils literal" > < span class = "pre" > a< / span > < / tt > is dereferenceable. If < tt class = "docutils literal" > < span class = "pre" > a< / span > < span class = "pre" > ==< / span > < span class = "pre" > b< / span > < / tt > then < tt class = "docutils literal" > < span class = "pre" > *a< / span > < / tt > < / dt >
< dd > is equivalent to < tt class = "docutils literal" > < span class = "pre" > *b< / span > < / tt > .< / dd >
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< / dl >
< / td >
< / tr >
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< tr > < td > < tt class = "docutils literal" > < span class = "pre" > a-> m< / span > < / tt > < / td >
< td > < tt class = "docutils literal" > < span class = "pre" > U& < / span > < / tt > < / td >
< td > pre: < tt class = "docutils literal" > < span class = "pre" > pre:< / span > < span class = "pre" > (*a).m< / span > < / tt > is well-defined. Equivalent to < tt class = "docutils literal" > < span class = "pre" > (*a).m< / span > < / tt > .< / td >
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