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< a name = "fusion.sequence.intrinsic.metafunctions.at" > < / a > < a 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 = "id463892" > < / a >
< a 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 href = "../functions/at.html" title = "at" > < tt class = "computeroutput" > < span class = "identifier" > at< / span > < / tt > < / a >
< sup > [< a name = "id463929" href = "#ftn.id463929" > 6< / a > ]< / sup >
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.
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< a name = "fusion.sequence.intrinsic.metafunctions.at.synopsis" > < / a > < h6 >
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< a name = "id464047" > < / a >
< a 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 = "id464162" > < / a > < p class = "title" > < b > Table<EFBFBD> 1.25.<2E> Parameters< / b > < / p >
< table class = "table" summary = "Parameters" >
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< colgroup >
< col >
< col >
< col >
< / colgroup >
< thead > < tr >
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< th > < p >
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Parameter
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< / p > < / th >
< th > < p >
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Requirement
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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" > Seq< / span > < / tt >
< / p > < / td >
< td > < p >
A model of < a href = "../../concepts/forward_sequence.html" title = "Forward
Sequence">Forward
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Sequence< / a >
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< / p > < / td >
< td > < p >
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Argument sequence
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< / 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 >
< td > < p >
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Index of element
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< / p > < / td >
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< / tr >
< / tbody >
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< / table >
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< a name = "fusion.sequence.intrinsic.metafunctions.at.expression_semantics" > < / a > < h6 >
< a name = "id464305" > < / a >
< a 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" > < b > Return type< / b > < / span > : Any type.
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< / p >
< p >
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< span class = "bold" > < b > Semantics< / b > < / span > : Returns the result type of
using < a href = "../functions/at.html" title = "at" > < tt class = "computeroutput" > < span class = "identifier" > at< / span > < / tt > < / a > to access the < tt class = "computeroutput" > < span class = "identifier" > N< / span > < / tt > th element of < tt class = "computeroutput" > < span class = "identifier" > Seq< / span > < / tt > .
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< / p >
< p >
/sequence/intrinsic/at.hpp>
< / p >
< a name = "fusion.sequence.intrinsic.metafunctions.at.example" > < / a > < h6 >
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< a name = "id464452" > < / a >
< a 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 href = "../../../container/vector.html" title = "vector" > < tt class = "computeroutput" > < span class = "identifier" > vector< / span > < / tt > < / 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 href = "at.html" title = "at" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > at< / span > < / tt > < / 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.id463929" href = "#id463929" > 6< / a > ] < / sup >
< a href = "at.html" title = "at" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > at< / span > < / tt > < / a > reflects the actual return
type of the function < a href = "../functions/at.html" title = "at" > < tt class = "computeroutput" > < span class = "identifier" > at< / span > < / tt > < / a > . < a href = "../../../sequence.html" title = "Sequence" > Sequence< / a > (s)
typically return references to its elements via the < a href = "../functions/at.html" title = "at" > < tt class = "computeroutput" > < span class = "identifier" > at< / span > < / tt > < / a > function. If you want
to get the actual element type, use < a href = "value_at.html" title = "value_at" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > value_at< / span > < / tt > < / a >
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< td align = "right" > < div class = "copyright-footer" > Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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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