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< title > find</ title >
< link rel = "stylesheet" href = "../../../../../../../../doc/html/boostbook.css" type = "text/css" >
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< link rel = "home" href = "../../../../index.html" title = "Chapter >
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< link rel = "home" href = "../../../../index.html" title = "Chapter 1. Fusion 2.0" >
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< link rel = "up" href = "../functions.html" title = "Functions" >
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< div class = "section" lang = "en" >
< div class = "titlepage" >
< div >< div >< h5 class = "title" >
< a name = "fusion.algorithm.query.functions.find" ></ a >< a href = "find.html" title = "find" > find</ a >
</ h5 ></ div ></ div >
< div ></ div >
</ div >
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< a name = "fusion.algorithm.query.functions.find.description" ></ a >< h6 >
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< a name = "id548407" ></ a >
< a href = "find.html#fusion.algorithm.query.functions.find.description" > Description</ a >
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< a class = "link" href = "find.html#fusion.algorithm.query.functions.find.description" > Description</ a >
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</ h6 >
< p >
Finds the first element of a given type within a sequence.
</ p >
< a name = "fusion.algorithm.query.functions.find.synopsis" ></ a >< h6 >
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< a name = "id548433" ></ a >
< a href = "find.html#fusion.algorithm.query.functions.find.synopsis" > Synopsis</ a >
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< a class = "link" href = "find.html#fusion.algorithm.query.functions.find.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" > T</ span >< span class = "special" > ,</ span >
< span class = "keyword" > typename</ span > < span class = "identifier" > Sequence</ span >
< span class = "special" > > </ span >
< span class = "emphasis" >< em > unspecified</ em ></ span > < span class = "identifier" > find</ span >< span class = "special" > (</ span >< span class = "identifier" > Sequence</ span > < span class = "keyword" > const</ span >< span class = "special" > & </ span > < span class = "identifier" > seq</ 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 = "keyword" > typename</ span > < span class = "identifier" > Sequence</ span >
< span class = "special" > > </ span >
< span class = "emphasis" >< em > unspecified</ em ></ span > < span class = "identifier" > find</ span >< span class = "special" > (</ span >< span class = "identifier" > Sequence</ span >< span class = "special" > & </ span > < span class = "identifier" > seq</ span >< span class = "special" > );</ span >
</ pre >
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< a name = "id548610" ></ a >< p class = "title" >< b > Table </ b ></ p >
< table class = "table" summary = "Parameters" >
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< a name = "id779009" ></ a >< p class = "title" >< b > Table  1.46.  Parameters</ b ></ p >
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< a name = "id763303" ></ a >< p class = "title" >< b > Table  1.46.  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 >< 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 = "../../../sequence/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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The sequence to search
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</ p ></ td >
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</ tr >
< tr >
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< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > T</ span ></ tt >
</ p ></ td >
< td >< p >
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Any type
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</ p ></ td >
< td >< p >
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The type to search for
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</ p ></ td >
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</ tr >
</ tbody >
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</ table >
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</ div >
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< a name = "fusion.algorithm.query.functions.find.expression_semantics" ></ a >< h6 >
< a name = "id548742" ></ a >
< a href = "find.html#fusion.algorithm.query.functions.find.expression_semantics" > Expression
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< br class = "table-break" >< a name = "fusion.algorithm.query.functions.find.expression_semantics" ></ a >< h6 >
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< a class = "link" href = "find.html#fusion.algorithm.query.functions.find.expression_semantics" > Expression
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Semantics</ a >
</ h6 >
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< pre class = "programlisting" >< a href = "find.html" title = "find" >< tt class = "computeroutput" >< span class = "identifier" > find</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "identifier" > T</ span >< span class = "special" > > (</ span >< span class = "identifier" > seq</ span >< span class = "special" > )</ span >
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</ pre >
< p >
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< span class = "bold" >< b > Return type</ b ></ span > : A model of the same iterator
category as the iterators of < tt class = "computeroutput" >< span class = "identifier" > seq</ span ></ tt > .
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</ p >
< p >
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< span class = "bold" >< b > Semantics</ b ></ span > : Returns an iterator to the
first element of < tt class = "computeroutput" >< span class = "identifier" > seq</ span ></ tt >
of type < tt class = "computeroutput" >< span class = "identifier" > T</ span ></ tt > , or < tt class = "computeroutput" >< a href = "../../../sequence/intrinsic/functions/end.html" title = "end" >< tt class = "computeroutput" >< span class = "identifier" > end</ span ></ tt ></ a >< span class = "special" > (</ span >< span class = "identifier" > seq</ span >< span class = "special" > )</ span ></ tt > if there is no such element. Equivalent
to < tt class = "computeroutput" >< a href = "find_if.html" title = "find_if" >< tt class = "computeroutput" >< span class = "identifier" > find_if</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > is_same</ span >< span class = "special" > < </ span >< span class = "identifier" > _</ span >< span class = "special" > ,</ span > < span class = "identifier" > T</ span >< span class = "special" > > </ span > < span class = "special" > > (</ span >< span class = "identifier" > seq</ span >< span class = "special" > )</ span ></ tt >
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</ p >
< a name = "fusion.algorithm.query.functions.find.complexity" ></ a >< h6 >
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< a href = "find.html#fusion.algorithm.query.functions.find.complexity" > Complexity</ a >
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< a class = "link" href = "find.html#fusion.algorithm.query.functions.find.complexity" > Complexity</ a >
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</ h6 >
< p >
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Linear. At most < tt class = "computeroutput" >< a href = "../../../sequence/intrinsic/metafunctions/size.html" title = "size" >< tt class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > size</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "identifier" > Sequence</ span >< span class = "special" > > ::</ span >< span class = "identifier" > value</ span ></ tt > comparisons.
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</ p >
< a name = "fusion.algorithm.query.functions.find.header" ></ a >< h6 >
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< a href = "find.html#fusion.algorithm.query.functions.find.header" > Header</ a >
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< a class = "link" href = "find.html#fusion.algorithm.query.functions.find.header" > Header</ a >
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</ h6 >
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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" > algorithm</ span >< span class = "special" > /</ span >< span class = "identifier" > query</ span >< span class = "special" > /</ span >< span class = "identifier" > find</ 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" > find</ span >< span class = "special" > .</ span >< span class = "identifier" > hpp</ span >< span class = "special" > > </ span >
</ pre >
< a name = "fusion.algorithm.query.functions.find.example" ></ a >< h6 >
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< a href = "find.html#fusion.algorithm.query.functions.find.example" > Example</ a >
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< a class = "link" href = "find.html#fusion.algorithm.query.functions.find.example" > Example</ a >
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</ h6 >
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< pre class = "programlisting" >< span class = "keyword" > const</ 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" > char</ span >< span class = "special" > ,</ span >< span class = "keyword" > int</ span >< span class = "special" > > </ span > < span class = "identifier" > vec</ span >< span class = "special" > (</ span >< span class = "char" > 'a'</ span >< span class = "special" > ,</ span >< span class = "char" > '0'</ span >< span class = "special" > );</ span >
< span class = "identifier" > assert</ span >< span class = "special" > (*</ span >< a href = "find.html" title = "find" >< tt class = "computeroutput" >< span class = "identifier" > find</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "keyword" > int</ span >< span class = "special" > > (</ span >< span class = "identifier" > vec</ span >< span class = "special" > )</ span > < span class = "special" > ==</ span > < span class = "char" > '0'</ span >< span class = "special" > );</ span >
< span class = "identifier" > assert</ span >< span class = "special" > (</ span >< a href = "find.html" title = "find" >< tt class = "computeroutput" >< span class = "identifier" > find</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "keyword" > double</ span >< span class = "special" > > (</ span >< span class = "identifier" > vec</ span >< span class = "special" > )</ span > < span class = "special" > ==</ span > < a href = "../../../sequence/intrinsic/functions/end.html" title = "end" >< tt class = "computeroutput" >< span class = "identifier" > end</ span ></ tt ></ a >< span class = "special" > (</ span >< span class = "identifier" > vec</ span >< span class = "special" > ));</ span >
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</ pre >
</ 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 > )
</ p >
</ div ></ td >
</ tr ></ table >
< hr >
< div class = "spirit-nav" >
< a accesskey = "p" href = "none.html" >< img src = "../../../../../../../../doc/html/images/prev.png" alt = "Prev" ></ a >< a accesskey = "u" href = "../functions.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 = "find_if.html" >< img src = "../../../../../../../../doc/html/images/next.png" alt = "Next" ></ a >
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