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< div class = "titlepage" >< div >< div >< h3 class = "title" >
< a name = "fusion.support.is_sequence" ></ a >< a href = "is_sequence.html" title = "is_sequence" > is_sequence</ a ></ h3 ></ div ></ div ></ div >
< a name = "fusion.support.is_sequence.description" ></ a >< h4 >
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< a name = "id459681" ></ a >
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< a href = "is_sequence.html#fusion.support.is_sequence.description" > Description</ a >
</ h4 >
< p >
Metafunction that evaluates to < tt class = "computeroutput" >< span class = "identifier" > mpl</ span >< span class = "special" > ::</ span >< span class = "identifier" > true_</ span ></ tt >
if a certain type < tt class = "computeroutput" >< span class = "identifier" > T</ span ></ tt > is a
conforming Fusion < a href = "../sequence.html" title = "Sequence" > Sequence</ a > , < tt class = "computeroutput" >< span class = "identifier" > mpl</ span >< span class = "special" > ::</ span >< span class = "identifier" > false_</ span ></ tt >
otherwise. This may be specialized to accomodate clients which provide Fusion
conforming sequences.
</ p >
< a name = "fusion.support.is_sequence.synopsis" ></ a >< h4 >
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< a name = "id459774" ></ a >
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< a href = "is_sequence.html#fusion.support.is_sequence.synopsis" > Synopsis</ a >
</ h4 >
< pre class = "programlisting" >
< span class = "keyword" > namespace</ span > < span class = "identifier" > traits</ span >
< span class = "special" > {</ span >
< span class = "keyword" > template</ span > < span class = "special" > < </ span >< span class = "keyword" > typename</ span > < span class = "identifier" > T</ span >< span class = "special" > > </ span >
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< span class = "keyword" > struct</ span > < span class = "identifier" > is_sequence</ span >
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< 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 >
< span class = "special" > }</ span >
</ pre >
< a name = "fusion.support.is_sequence.parameters" ></ a >< h4 >
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< a name = "id459906" ></ a >
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< a href = "is_sequence.html#fusion.support.is_sequence.parameters" > Parameters</ a >
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< p >
Parameter
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</ th >
< th >
< p >
Requirement
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</ th >
< th >
< p >
Description
</ p >
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< tbody >< tr >
< td >
< p >
< tt class = "computeroutput" >< span class = "identifier" > T</ span ></ tt >
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< p >
Any type
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< td >
< p >
The type to query.
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</ td >
</ tr ></ tbody >
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< a name = "fusion.support.is_sequence.expression_semantics" ></ a >< h4 >
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< a name = "id460012" ></ a >
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< a href = "is_sequence.html#fusion.support.is_sequence.expression_semantics" > Expression
Semantics</ a >
</ h4 >
< pre class = "programlisting" >
< span class = "keyword" > typedef</ span > < span class = "identifier" > traits</ span >< span class = "special" > ::</ span >< span class = "identifier" > is_sequence</ span >< span class = "special" > < </ span >< span class = "identifier" > T</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span > < span class = "identifier" > c</ span >< span class = "special" > ;</ span >
</ pre >
< p >
< span class = "bold" >< b > Return type</ b ></ span > : An < a href = "http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target = "_top" > MPL
Boolean Constant</ a > .
</ p >
< p >
< span class = "bold" >< b > Semantics</ b ></ span > : Metafunction that evaluates to
< tt class = "computeroutput" >< span class = "identifier" > mpl</ span >< span class = "special" > ::</ span >< span class = "identifier" > true_</ span ></ tt > if a certain type < tt class = "computeroutput" >< span class = "identifier" > T</ span ></ tt >
is a conforming Fusion sequence, < tt class = "computeroutput" >< span class = "identifier" > mpl</ span >< span class = "special" > ::</ span >< span class = "identifier" > false_</ span ></ tt >
otherwise.
</ p >
< a name = "fusion.support.is_sequence.header" ></ a >< h4 >
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< a name = "id460182" ></ a >
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< a href = "is_sequence.html#fusion.support.is_sequence.header" > Header</ a >
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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" > support</ span >< span class = "special" > /</ span >< span class = "identifier" > is_sequence</ 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" > is_sequence</ span >< span class = "special" > .</ span >< span class = "identifier" > hpp</ span >< span class = "special" > > </ span >
</ pre >
< a name = "fusion.support.is_sequence.example" ></ a >< h4 >
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< a name = "id460339" ></ a >
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< a href = "is_sequence.html#fusion.support.is_sequence.example" > Example</ a >
</ h4 >
< pre class = "programlisting" >
< span class = "identifier" > BOOST_MPL_ASSERT_NOT</ span >< span class = "special" > ((</ span > < span class = "identifier" > traits</ span >< span class = "special" > ::</ span >< span class = "identifier" > is_sequence</ span >< span class = "special" > < </ span > < span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > vector</ span >< span class = "special" > < </ span >< span class = "keyword" > int</ span >< span class = "special" > > </ span > < span class = "special" > > </ span > < span class = "special" > ));</ span >
< span class = "identifier" > BOOST_MPL_ASSERT_NOT</ span >< span class = "special" > ((</ span > < span class = "identifier" > is_sequence</ span >< span class = "special" > < </ span > < span class = "keyword" > int</ span > < span class = "special" > > </ span > < span class = "special" > ));</ span >
< span class = "identifier" > BOOST_MPL_ASSERT</ span >< span class = "special" > ((</ span > < span class = "identifier" > traits</ span >< span class = "special" > ::</ span >< span class = "identifier" > is_sequence</ span >< span class = "special" > < </ span >< a href = "../container/list.html" title = "list" >< tt class = "computeroutput" >< span class = "identifier" > list</ span ></ tt ></ a >< span class = "special" > <> </ span > < span class = "special" > > </ span > < span class = "special" > ));</ span >
< span class = "identifier" > BOOST_MPL_ASSERT</ span >< span class = "special" > ((</ span > < span class = "identifier" > traits</ span >< span class = "special" > ::</ span >< span class = "identifier" > is_sequence</ span >< span class = "special" > < </ span >< a href = "../container/list.html" title = "list" >< tt class = "computeroutput" >< span class = "identifier" > list</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "keyword" > int</ span >< span class = "special" > > </ span > < span class = "special" > > </ span > < span class = "special" > ));</ span >
< span class = "identifier" > BOOST_MPL_ASSERT</ span >< span class = "special" > ((</ span > < span class = "identifier" > traits</ span >< span class = "special" > ::</ span >< span class = "identifier" > is_sequence</ span >< span class = "special" > < </ span >< a href = "../container/vector.html" title = "vector" >< tt class = "computeroutput" >< span class = "identifier" > vector</ span ></ tt ></ a >< span class = "special" > <> </ span > < span class = "special" > > </ span > < span class = "special" > ));</ span >
< span class = "identifier" > BOOST_MPL_ASSERT</ span >< span class = "special" > ((</ span > < span class = "identifier" > traits</ span >< span class = "special" > ::</ span >< span class = "identifier" > is_sequence</ span >< span class = "special" > < </ 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 = "special" > > </ span > < span class = "special" > ));</ span >
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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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