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< div class = "section" title = "deduce" >
< div class = "titlepage" >< div >< div >< h3 class = "title" >
< a name = "fusion.support.deduce" ></ a >< a class = "link" href = "deduce.html" title = "deduce" > deduce</ a >
</ h3 ></ div ></ div ></ div >
< a name = "fusion.support.deduce.description" ></ a >< h5 >
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< a name = "id617317" ></ a >
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< a class = "link" href = "deduce.html#fusion.support.deduce.description" > Description</ a >
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< p >
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Metafunction to apply < a class = "link" href = "../notes.html#fusion.notes.element_conversion" >< span class = "emphasis" >< em > element
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conversion</ em ></ span ></ a > to the full argument type.
</ p >
< p >
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It removes references to < code class = "computeroutput" >< span class = "keyword" > const</ span ></ code > ,
references to array types are kept, even if the array is < code class = "computeroutput" >< span class = "keyword" > const</ span ></ code > .
Reference wrappers are removed (see < a class = "link" href = "../notes.html#fusion.notes.boost__ref" >< code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > ref</ span ></ code ></ a > ).
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</ p >
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< a name = "fusion.support.deduce.header" ></ a >< h5 >
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< a name = "id617375" ></ a >
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< a class = "link" href = "deduce.html#fusion.support.deduce.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" > deduce</ 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" > deduce</ span >< span class = "special" > .</ span >< span class = "identifier" > hpp</ span >< span class = "special" > > </ span >
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< a name = "fusion.support.deduce.synopsis" ></ a >< h5 >
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< a name = "id617483" ></ a >
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< a class = "link" href = "deduce.html#fusion.support.deduce.synopsis" > Synopsis</ a >
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< pre class = "programlisting" >< span class = "keyword" > namespace</ span > < span class = "identifier" > traits</ span >
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< 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 >
< span class = "keyword" > struct</ span > < span class = "identifier" > deduce</ 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 >
< span class = "special" > }</ span >
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< a name = "fusion.support.deduce.example" ></ a >< h5 >
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< a name = "id617576" ></ a >
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< a class = "link" href = "deduce.html#fusion.support.deduce.example" > Example</ a >
</ h5 >
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< pre class = "programlisting" >< 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" > holder</ span >
< span class = "special" > {</ span >
< span class = "keyword" > typename</ span > < span class = "identifier" > traits</ span >< span class = "special" > ::</ span >< span class = "identifier" > deduce</ span >< span class = "special" > < </ span >< span class = "identifier" > T</ span > < span class = "keyword" > const</ span > < span class = "special" > &> ::</ span >< span class = "identifier" > type</ span > < span class = "identifier" > element</ span >< span class = "special" > ;</ span >
< span class = "identifier" > holder</ span >< span class = "special" > (</ span >< span class = "identifier" > T</ span > < span class = "keyword" > const</ span > < span class = "special" > & </ span > < span class = "identifier" > a</ span >< span class = "special" > )</ span >
< span class = "special" > :</ span > < span class = "identifier" > element</ span >< span class = "special" > (</ span >< span class = "identifier" > a</ span >< span class = "special" > )</ span >
< span class = "special" > {</ span > < span class = "special" > }</ 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 >
< span class = "identifier" > holder</ span >< span class = "special" > < </ span >< span class = "identifier" > T</ span >< span class = "special" > > </ span > < span class = "identifier" > make_holder</ span >< span class = "special" > (</ span >< span class = "identifier" > T</ span > < span class = "keyword" > const</ span > < span class = "special" > & </ span > < span class = "identifier" > a</ span >< span class = "special" > )</ span >
< span class = "special" > {</ span >
< span class = "keyword" > return</ span > < span class = "identifier" > holder</ span >< span class = "special" > < </ span >< span class = "identifier" > T</ span >< span class = "special" > > (</ span >< span class = "identifier" > a</ span >< span class = "special" > );</ span >
< span class = "special" > }</ span >
</ pre >
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< a name = "fusion.support.deduce.see_also" ></ a >< h5 >
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< a name = "id617844" ></ a >
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< a class = "link" href = "deduce.html#fusion.support.deduce.see_also" > See also</ a >
</ h5 >
< div class = "itemizedlist" >< ul class = "itemizedlist" type = "disc" >< li class = "listitem" >< a class = "link" href = "deduce_sequence.html" title = "deduce_sequence" >< code class = "computeroutput" >< span class = "identifier" > deduce_sequence</ span ></ code ></ a ></ li ></ ul ></ div >
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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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