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< a accesskey = "p" href = "size.html" > < img src = "../../../../../../../../doc/src/images/prev.png" alt = "Prev" > < / a > < a accesskey = "u" href = "../metafunctions.html" > < img src = "../../../../../../../../doc/src/images/up.png" alt = "Up" > < / a > < a accesskey = "h" href = "../../../../index.html" > < img src = "../../../../../../../../doc/src/images/home.png" alt = "Home" > < / a > < a accesskey = "n" href = "at_c.html" > < img src = "../../../../../../../../doc/src/images/next.png" alt = "Next" > < / a >
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< a name = "fusion.sequence.intrinsic.metafunctions.at" > < / a > < a class = "link" href = "at.html" title = "at" > at< / a >
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< a name = "fusion.sequence.intrinsic.metafunctions.at.description" > < / a > < h6 >
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< a name = "id891981" > < / a >
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< a class = "link" href = "at.html#fusion.sequence.intrinsic.metafunctions.at.description" > Description< / a >
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< / h6 >
< p >
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Returns the result type of < a class = "link" href = "../functions/at.html" title = "at" > < code class = "computeroutput" > < span class = "identifier" > at< / span > < / code > < / a > < sup > [< a name = "id892002" href = "#ftn.id892002" class = "footnote" > 6< / a > ]< / sup > .
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< / p >
< a name = "fusion.sequence.intrinsic.metafunctions.at.synopsis" > < / a > < h6 >
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< a name = "id892072" > < / a >
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< a class = "link" href = "at.html#fusion.sequence.intrinsic.metafunctions.at.synopsis" > Synopsis< / a >
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< / h6 >
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< pre class = "programlisting" > < span class = "keyword" > template< / span > < span class = "special" > < < / span >
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< span class = "keyword" > typename< / span > < span class = "identifier" > Seq< / span > < span class = "special" > ,< / span >
< span class = "keyword" > typename< / span > < span class = "identifier" > N< / span > < span class = "special" > > < / span >
< span class = "keyword" > struct< / span > < span class = "identifier" > at< / span >
< span class = "special" > {< / span >
< span class = "keyword" > typedef< / span > < span class = "emphasis" > < em > unspecified< / em > < / span > < span class = "identifier" > type< / span > < span class = "special" > ;< / span >
< span class = "special" > };< / span >
< / pre >
< div class = "table" >
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< a name = "id892156" > < / a > < p class = "title" > < b > Table  1.29.  Parameters< / b > < / p >
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< div class = "table-contents" > < table class = "table" summary = "Parameters" >
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< colgroup >
< col >
< col >
< col >
< / colgroup >
< thead > < tr >
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< th >
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< p >
Parameter
< / p >
< / th >
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< th >
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< p >
Requirement
< / p >
< / th >
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< th >
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< p >
Description
< / p >
< / th >
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< / tr > < / thead >
< tbody >
< tr >
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< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > Seq< / span > < / code >
< / p >
< / td >
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< td >
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< p >
A model of < a class = "link" href = "../../concepts/forward_sequence.html" title = "Forward Sequence" > Forward
Sequence< / a >
< / p >
< / td >
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< td >
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< p >
Argument sequence
< / p >
< / td >
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< / tr >
< tr >
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< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > N< / span > < / code >
< / p >
< / td >
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< td >
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< p >
An < a href = "http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target = "_top" > MPL
Integral Constant< / a >
< / p >
< / td >
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< td >
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< p >
Index of element
< / p >
< / td >
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< / tr >
< / tbody >
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< / table > < / div >
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< / div >
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< br class = "table-break" > < a name = "fusion.sequence.intrinsic.metafunctions.at.expression_semantics" > < / a > < h6 >
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< a name = "id892285" > < / a >
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< a class = "link" href = "at.html#fusion.sequence.intrinsic.metafunctions.at.expression_semantics" > Expression
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Semantics< / a >
< / h6 >
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< pre class = "programlisting" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > at< / span > < span class = "special" > < < / span > < span class = "identifier" > Seq< / span > < span class = "special" > ,< / span > < span class = "identifier" > N< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span >
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< / pre >
< p >
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< span class = "bold" > < strong > Return type< / strong > < / span > : Any type.
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< / p >
< p >
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< span class = "bold" > < strong > Semantics< / strong > < / span > : Returns the result type of
using < a class = "link" href = "../functions/at.html" title = "at" > < code class = "computeroutput" > < span class = "identifier" > at< / span > < / code > < / a > to access the < code class = "computeroutput" > < span class = "identifier" > N< / span > < / code > th element of < code class = "computeroutput" > < span class = "identifier" > Seq< / span > < / code > .
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< / p >
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< a name = "fusion.sequence.intrinsic.metafunctions.at.header" > < / a > < h6 >
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< a name = "id892380" > < / a >
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< a class = "link" href = "at.html#fusion.sequence.intrinsic.metafunctions.at.header" > Header< / a >
< / h6 >
< 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" > sequence< / span > < span class = "special" > /< / span > < span class = "identifier" > intrinsic< / span > < span class = "special" > /< / span > < span class = "identifier" > at< / span > < span class = "special" > .< / span > < span class = "identifier" > hpp< / span > < span class = "special" > > < / span >
< 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" > at< / span > < span class = "special" > .< / span > < span class = "identifier" > hpp< / span > < span class = "special" > > < / span >
< / pre >
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< a name = "fusion.sequence.intrinsic.metafunctions.at.example" > < / a > < h6 >
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< a name = "id892495" > < / a >
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< a class = "link" href = "at.html#fusion.sequence.intrinsic.metafunctions.at.example" > Example< / a >
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< / h6 >
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< pre class = "programlisting" > < span class = "keyword" > typedef< / span > < a class = "link" href = "../../../container/vector.html" title = "vector" > < code class = "computeroutput" > < span class = "identifier" > vector< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "keyword" > int< / span > < span class = "special" > ,< / span > < span class = "keyword" > float< / span > < span class = "special" > ,< / span > < span class = "keyword" > char< / span > < span class = "special" > > < / span > < span class = "identifier" > vec< / span > < span class = "special" > ;< / span >
< span class = "identifier" > BOOST_MPL_ASSERT< / span > < span class = "special" > ((< / span > < span class = "identifier" > boost< / span > < span class = "special" > ::< / span > < span class = "identifier" > is_same< / span > < span class = "special" > < < / span > < a class = "link" href = "at.html" title = "at" > < code class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > at< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "identifier" > vec< / span > < span class = "special" > ,< / span > < span class = "identifier" > boost< / span > < span class = "special" > ::< / span > < span class = "identifier" > mpl< / span > < span class = "special" > ::< / span > < span class = "identifier" > int_< / span > < span class = "special" > < < / span > < span class = "number" > 1< / span > < span class = "special" > > < / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < span class = "special" > ,< / span > < span class = "keyword" > float< / span > < span class = "special" > & > ));< / span >
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< / pre >
< div class = "footnotes" >
< br > < hr width = "100" align = "left" >
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< div class = "footnote" > < p > < sup > [< a name = "ftn.id892002" href = "#id892002" class = "para" > 6< / a > ] < / sup >
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< a class = "link" href = "at.html" title = "at" > < code class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > at< / span > < / code > < / a > reflects the actual return
type of the function < a class = "link" href = "../functions/at.html" title = "at" > < code class = "computeroutput" > < span class = "identifier" > at< / span > < / code > < / a > . < a class = "link" href = "../../../sequence.html" title = "Sequence" > Sequence< / a > (s)
typically return references to its elements via the < a class = "link" href = "../functions/at.html" title = "at" > < code class = "computeroutput" > < span class = "identifier" > at< / span > < / code > < / a > function. If you want to
get the actual element type, use < a class = "link" href = "value_at.html" title = "value_at" > < code class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > value_at< / span > < / code > < / a >
< / p > < / div >
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< / div >
< / div >
< table xmlns:rev = "http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width = "100%" > < tr >
< td align = "left" > < / td >
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< td align = "right" > < div class = "copyright-footer" > Copyright © 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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