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< html >
< head >
< meta http-equiv = "Content-Type" content = "text/html; charset=ISO-8859-1" >
< title > Iterator Facade< / title >
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< td valign = "top" > < img alt = "Boost C++ Libraries" width = "277" height = "86" src = "../../../../../../boost.png" > < / td >
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< td align = "center" > < a href = "../../../../../../index.html" > Home< / a > < / td >
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< a accesskey = "p" href = "sequence_facade.html" > < img src = "../../../../../../doc/html/images/prev.png" alt = "Prev" > < / a > < a accesskey = "u" href = "../extension.html" > < img src = "../../../../../../doc/html/images/up.png" alt = "Up" > < / a > < a accesskey = "h" href = "../../index.html" > < img src = "../../../../../../doc/html/images/home.png" alt = "Home" > < / a > < a accesskey = "n" href = "../functional.html" > < img src = "../../../../../../doc/html/images/next.png" alt = "Next" > < / a >
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< div class = "section" lang = "en" >
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< div class = "titlepage" >
< div > < div > < h3 class = "title" >
< a name = "fusion.extension.iterator_facade" > < / a > < a href = "iterator_facade.html" title = "Iterator Facade" > Iterator Facade< / a >
< / h3 > < / div > < / div >
< div > < / div >
< / div >
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< a name = "fusion.extension.iterator_facade.description" > < / a > < h4 >
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< a name = "id605224" > < / a >
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< a href = "iterator_facade.html#fusion.extension.iterator_facade.description" > Description< / a >
< / h4 >
< p >
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The < a href = "iterator_facade.html" title = "Iterator Facade" > < tt class = "computeroutput" > < span class = "identifier" > iterator_facade< / span > < / tt > < / a >
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template provides an intrusive mechanism for producing a conforming Fusion
iterator.
< / p >
< a name = "fusion.extension.iterator_facade.synopsis" > < / a > < h4 >
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< a name = "id605272" > < / a >
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< a href = "iterator_facade.html#fusion.extension.iterator_facade.synopsis" > Synopsis< / a >
< / h4 >
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< pre class = "programlisting" > < span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > typename< / span > < span class = "identifier" > Derived< / span > < span class = "special" > ,< / span > < span class = "keyword" > typename< / span > < span class = "identifier" > TravesalTag< / span > < span class = "special" > > < / span >
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< span class = "keyword" > struct< / span > < span class = "identifier" > iterator_facade< / span > < span class = "special" > ;< / span >
< / pre >
< a name = "fusion.extension.iterator_facade.usage" > < / a > < h4 >
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< a name = "id605364" > < / a >
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< a href = "iterator_facade.html#fusion.extension.iterator_facade.usage" > Usage< / a >
< / h4 >
< p >
The user of iterator_facade derives his iterator type from a specialization
of iterator_facade and passes the derived iterator type as the first template
parameter. The second template parameter should be the traversal category
of the iterator being implemented.
< / p >
< p >
The user must the implement the key expressions required by their iterator
type.
< / p >
< div class = "table" >
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< a name = "id605390" > < / a > < p class = "title" > < b > Table<EFBFBD> 1.93.<2E> Parameters< / b > < / p >
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< table class = "table" summary = "Parameters" >
< colgroup >
< col >
< col >
< / colgroup >
< thead > < tr >
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< th > < p >
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Name
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< / p > < / th >
< th > < p >
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Description
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< / p > < / th >
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< / tr > < / thead >
< tbody >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > iterator< / span > < / tt > , < tt class = "computeroutput" > < span class = "identifier" > It< / span > < / tt > , < tt class = "computeroutput" > < span class = "identifier" > It1< / span > < / tt > ,
< tt class = "computeroutput" > < span class = "identifier" > It2< / span > < / tt >
< / p > < / td >
< td > < p >
A type derived from < a href = "iterator_facade.html" title = "Iterator Facade" > < tt class = "computeroutput" > < span class = "identifier" > iterator_facade< / span > < / tt > < / a >
< / p > < / td >
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< / tr >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > N< / span > < / tt >
< / p > < / td >
< td > < p >
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An < a href = "http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target = "_top" > MPL
Integral Constant< / a >
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< / p > < / td >
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< / tr >
< / tbody >
< / table >
< / div >
< div class = "table" >
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< a name = "id605548" > < / a > < p class = "title" > < b > Table<EFBFBD> 1.94.<2E> Key Expressions< / b > < / p >
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< table class = "table" summary = "Key Expressions" >
< colgroup >
< col >
< col >
< col >
< / colgroup >
< thead > < tr >
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< th > < p >
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Expression
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< / p > < / th >
< th > < p >
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Result
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< / p > < / th >
< th > < p >
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Default
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< / p > < / th >
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< / tr > < / thead >
< tbody >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > iterator< / span > < span class = "special" > ::< / span > < span class = "keyword" > template< / span > < span class = "identifier" > value_of< / span > < span class = "special" > < < / span > < span class = "identifier" > It< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < / tt >
< / p > < / td >
< td > < p >
The element stored at iterator position < tt class = "computeroutput" > < span class = "identifier" > It< / span > < / tt >
< / p > < / td >
< td > < p >
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None
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< / p > < / td >
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< / tr >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > iterator< / span > < span class = "special" > ::< / span > < span class = "keyword" > template< / span > < span class = "identifier" > deref< / span > < span class = "special" > < < / span > < span class = "identifier" > It< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < / tt >
< / p > < / td >
< td > < p >
The type returned when dereferencing an iterator of type < tt class = "computeroutput" > < span class = "identifier" > It< / span > < / tt >
< / p > < / td >
< td > < p >
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None
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< / p > < / td >
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< / tr >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > iterator< / span > < span class = "special" > ::< / span > < span class = "keyword" > template< / span > < span class = "identifier" > deref< / span > < span class = "special" > < < / span > < span class = "identifier" > It< / span > < span class = "special" > > ::< / span > < span class = "identifier" > call< / span > < span class = "special" > (< / span > < span class = "identifier" > it< / span > < span class = "special" > )< / span > < / tt >
< / p > < / td >
< td > < p >
Dereferences iterator < tt class = "computeroutput" > < span class = "identifier" > it< / span > < / tt >
< / p > < / td >
< td > < p >
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None
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< / p > < / td >
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< / tr >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > iterator< / span > < span class = "special" > ::< / span > < span class = "keyword" > template< / span > < span class = "identifier" > next< / span > < span class = "special" > < < / span > < span class = "identifier" > It< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < / tt >
< / p > < / td >
< td > < p >
The type of the next element from < tt class = "computeroutput" > < span class = "identifier" > It< / span > < / tt >
< / p > < / td >
< td > < p >
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None
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< / p > < / td >
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< / tr >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > iterator< / span > < span class = "special" > ::< / span > < span class = "keyword" > template< / span > < span class = "identifier" > next< / span > < span class = "special" > < < / span > < span class = "identifier" > It< / span > < span class = "special" > > ::< / span > < span class = "identifier" > call< / span > < span class = "special" > (< / span > < span class = "identifier" > it< / span > < span class = "special" > )< / span > < / tt >
< / p > < / td >
< td > < p >
The next iterator after < tt class = "computeroutput" > < span class = "identifier" > it< / span > < / tt >
< / p > < / td >
< td > < p >
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None
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< / p > < / td >
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< / tr >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > iterator< / span > < span class = "special" > ::< / span > < span class = "keyword" > template< / span > < span class = "identifier" > prior< / span > < span class = "special" > < < / span > < span class = "identifier" > It< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < / tt >
< / p > < / td >
< td > < p >
The type of the next element from < tt class = "computeroutput" > < span class = "identifier" > It< / span > < / tt >
< / p > < / td >
< td > < p >
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None
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< / p > < / td >
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< / tr >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > iterator< / span > < span class = "special" > ::< / span > < span class = "keyword" > template< / span > < span class = "identifier" > prior< / span > < span class = "special" > < < / span > < span class = "identifier" > It< / span > < span class = "special" > > ::< / span > < span class = "identifier" > call< / span > < span class = "special" > (< / span > < span class = "identifier" > it< / span > < span class = "special" > )< / span > < / tt >
< / p > < / td >
< td > < p >
The next iterator after < tt class = "computeroutput" > < span class = "identifier" > it< / span > < / tt >
< / p > < / td >
< td > < p >
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None
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< / p > < / td >
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< / tr >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > iterator< / span > < span class = "special" > ::< / span > < span class = "keyword" > template< / span > < span class = "identifier" > advance< / span > < span class = "special" > < < / span > < span class = "identifier" > It< / span > < span class = "special" > ,< / span > < span class = "identifier" > N< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < / tt >
< / p > < / td >
< td > < p >
The type of an iterator advanced < tt class = "computeroutput" > < span class = "identifier" > N< / span > < / tt >
elements from < tt class = "computeroutput" > < span class = "identifier" > It< / span > < / tt >
< / p > < / td >
< td > < p >
Implemented in terms of < tt class = "computeroutput" > < span class = "identifier" > next< / span > < / tt >
and < tt class = "computeroutput" > < span class = "identifier" > prior< / span > < / tt >
< / p > < / td >
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< / tr >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > iterator< / span > < span class = "special" > ::< / span > < span class = "keyword" > template< / span > < span class = "identifier" > advance< / span > < span class = "special" > < < / span > < span class = "identifier" > It< / span > < span class = "special" > ,< / span > < span class = "identifier" > N< / span > < span class = "special" > > ::< / span > < span class = "identifier" > call< / span > < span class = "special" > (< / span > < span class = "identifier" > it< / span > < span class = "special" > )< / span > < / tt >
< / p > < / td >
< td > < p >
An iterator advanced < tt class = "computeroutput" > < span class = "identifier" > N< / span > < / tt >
elements from < tt class = "computeroutput" > < span class = "identifier" > it< / span > < / tt >
< / p > < / td >
< td > < p >
Implemented in terms of < tt class = "computeroutput" > < span class = "identifier" > next< / span > < / tt >
and < tt class = "computeroutput" > < span class = "identifier" > prior< / span > < / tt >
< / p > < / td >
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< / tr >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > iterator< / span > < span class = "special" > ::< / span > < span class = "keyword" > template< / span > < span class = "identifier" > distance< / span > < span class = "special" > < < / span > < span class = "identifier" > It1< / span > < span class = "special" > ,< / span > < span class = "identifier" > It2< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < / tt >
< / p > < / td >
< td > < p >
The distance between iterators of type < tt class = "computeroutput" > < span class = "identifier" > It1< / span > < / tt >
and < tt class = "computeroutput" > < span class = "identifier" > It2< / span > < / tt > as an < a href = "http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target = "_top" > MPL
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Integral Constant< / a >
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< / p > < / td >
< td > < p >
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None
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< / p > < / td >
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< / tr >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > iterator< / span > < span class = "special" > ::< / span > < span class = "keyword" > template< / span > < span class = "identifier" > distance< / span > < span class = "special" > < < / span > < span class = "identifier" > It1< / span > < span class = "special" > ,< / span > < span class = "identifier" > It2< / span > < span class = "special" > > ::< / span > < span class = "identifier" > call< / span > < span class = "special" > (< / span > < span class = "identifier" > it1< / span > < span class = "special" > ,< / span > < span class = "identifier" > it2< / span > < span class = "special" > )< / span > < / tt >
< / p > < / td >
< td > < p >
The distance between iterator < tt class = "computeroutput" > < span class = "identifier" > it1< / span > < / tt >
and < tt class = "computeroutput" > < span class = "identifier" > it2< / span > < / tt >
< / p > < / td >
< td > < p >
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None
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< / p > < / td >
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< / tr >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > iterator< / span > < span class = "special" > ::< / span > < span class = "keyword" > template< / span > < span class = "identifier" > equal_to< / span > < span class = "special" > < < / span > < span class = "identifier" > It1< / span > < span class = "special" > ,< / span > < span class = "identifier" > It2< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < / tt >
< / p > < / td >
< td > < p >
The distance between iterators of type < tt class = "computeroutput" > < span class = "identifier" > It1< / span > < / tt >
and < tt class = "computeroutput" > < span class = "identifier" > It2< / span > < / tt >
< / p > < / td >
< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > boost< / span > < span class = "special" > ::< / span > < span class = "identifier" > same_type< / span > < span class = "special" > < < / span > < span class = "identifier" > It1< / span > < span class = "special" > ,< / span > < span class = "identifier" > It2< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < / tt >
< / p > < / td >
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< / tr >
< tr >
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< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > iterator< / span > < span class = "special" > ::< / span > < span class = "keyword" > template< / span > < span class = "identifier" > equal_to< / span > < span class = "special" > < < / span > < span class = "identifier" > It1< / span > < span class = "special" > ,< / span > < span class = "identifier" > It2< / span > < span class = "special" > > ::< / span > < span class = "identifier" > call< / span > < span class = "special" > (< / span > < span class = "identifier" > it1< / span > < span class = "special" > ,< / span > < span class = "identifier" > it2< / span > < span class = "special" > )< / span > < / tt >
< / p > < / td >
< td > < p >
The distance between iterators < tt class = "computeroutput" > < span class = "identifier" > it1< / span > < / tt >
and < tt class = "computeroutput" > < span class = "identifier" > it2< / span > < / tt >
< / p > < / td >
< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > boost< / span > < span class = "special" > ::< / span > < span class = "identifier" > same_type< / span > < span class = "special" > < < / span > < span class = "identifier" > It1< / span > < span class = "special" > ,< / span > < span class = "identifier" > It2< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < span class = "special" > ()< / span > < / tt >
< / p > < / td >
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< / tr >
< / tbody >
< / table >
< / div >
< a name = "fusion.extension.iterator_facade.header" > < / a > < h4 >
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< a name = "id607107" > < / a >
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< a href = "iterator_facade.html#fusion.extension.iterator_facade.header" > Header< / a >
< / h4 >
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< pre class = "programlisting" > < span class = "preprocessor" > #include< / span > < span class = "special" > < < / span > < span class = "identifier" > boost< / span > < span class = "special" > /< / span > < span class = "identifier" > fusion< / span > < span class = "special" > /< / span > < span class = "identifier" > iterator< / span > < span class = "special" > /< / span > < span class = "identifier" > iterator_facade< / span > < span class = "special" > .< / span > < span class = "identifier" > hpp< / span > < span class = "special" > > < / span >
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< span class = "preprocessor" > #include< / span > < span class = "special" > < < / span > < span class = "identifier" > boost< / span > < span class = "special" > /< / span > < span class = "identifier" > fusion< / span > < span class = "special" > /< / span > < span class = "identifier" > include< / span > < span class = "special" > /< / span > < span class = "identifier" > iterator_facade< / span > < span class = "special" > .< / span > < span class = "identifier" > hpp< / span > < span class = "special" > > < / span >
< / pre >
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< a name = "fusion.extension.iterator_facade.example" > < / a > < h4 >
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< a name = "id607264" > < / a >
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< a href = "iterator_facade.html#fusion.extension.iterator_facade.example" > Example< / a >
< / h4 >
< p >
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A full working example using < a href = "iterator_facade.html" title = "Iterator Facade" > < tt class = "computeroutput" > < span class = "identifier" > iterator_facade< / span > < / tt > < / a > is provided in triple.cpp
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in the extension examples.
< / p >
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< td align = "right" > < div class = "copyright-footer" > Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger< p >
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at < a href = "http://www.boost.org/LICENSE_1_0.txt" target = "_top" > http://www.boost.org/LICENSE_1_0.txt< / a > )
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