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< html >
< head >
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< meta http-equiv = "Content-Type" content = "text/html; charset=US-ASCII" >
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< title >
invoke_function_object</ title >
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< link rel = "stylesheet" href = "../../../../../../../../doc/html/boostbook.css" type = "text/css" >
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<<<<<< < .working
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< meta name = "generator" content = "DocBook XSL Stylesheets V1.65.1" >
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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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< link rel = "previous" href = "invoke_proc.html" title = "
invoke_procedure" >
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< link rel = "next" href = "../metafunctions.html" title = "Metafunctions" >
</ head >
< body bgcolor = "white" text = "black" link = "#0000FF" vlink = "#840084" alink = "#0000FF" >
< table cellpadding = "2" width = "100%" >< tr >
< td valign = "top" >< img alt = "Boost C++ Libraries" width = "277" height = "86" src = "../../../../../../../../boost.png" ></ td >
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< td align = "center" >< a href = "../../../../../../../../index.html" > Home</ a ></ td >
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< td align = "center" >< a href = "http://www.boost.org/users/people.html" > People</ a ></ td >
< td align = "center" >< a href = "http://www.boost.org/users/faq.html" > FAQ</ a ></ td >
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< td align = "center" >< a href = "../../../../../../../../more/index.htm" > More</ a ></ td >
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< a accesskey = "p" href = "invoke_proc.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 = "../metafunctions.html" >< img src = "../../../../../../../../doc/html/images/next.png" alt = "Next" ></ a >
</ div >
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< div class = "section" lang = "en" >
< div class = "titlepage" >
< div >< div >< h5 class = "title" >
< a name = "fusion.functional.invocation.functions.invoke_fobj" ></ a >< a href = "invoke_fobj.html" title = "
invoke_function_object" >
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invoke_function_object</ a >
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</ h5 ></ div ></ div >
< div ></ div >
</ div >
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< a name = "fusion.functional.invocation.functions.invoke_fobj.description" ></ a >< h6 >
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< a name = "id615066" ></ a >
< a href = "invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.description" > Description</ a >
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< a class = "link" href = "invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.description" > Description</ a >
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</ h6 >
< p >
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Calls a < a href = "../../concepts/poly.html" title = " Polymorphic Function
Object" > Polymorphic Function
Object</ a > with the arguments from a < a href = "../../../sequence.html" title = "Sequence" > Sequence</ a > .
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</ p >
< p >
The first template parameter can be specialized explicitly to avoid copying
and/or to control the const qualification of a function object.
</ p >
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< p >
Constructors can be called applying < a href = "http://www.boost.org/libs/functional/factory/doc/html/index.html" target = "_top" > Boost.Functional/Factory</ a > .
</ p >
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< a name = "fusion.functional.invocation.functions.invoke_fobj.synopsis" ></ a >< h6 >
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< a name = "id615129" ></ a >
< a href = "invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.synopsis" > Synopsis</ a >
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< a class = "link" href = "invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.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" > Function</ span >< span class = "special" > ,</ span >
< span class = "keyword" > class</ span > < span class = "identifier" > Sequence</ span >
< span class = "special" > > </ span >
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< span class = "keyword" > typename</ span > < a href = "../metafunctions/invoke_fobj.html" title = "
invoke_function_object" >< tt class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > invoke_function_object</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "identifier" > Function</ span >< span class = "special" > ,</ span > < span class = "identifier" > Sequence</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span >
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< span class = "identifier" > invoke_function_object</ span >< span class = "special" > (</ span >< span class = "identifier" > Function</ span > < span class = "identifier" > f</ span >< span class = "special" > ,</ span > < span class = "identifier" > Sequence</ span > < span class = "special" > & </ span > < span class = "identifier" > s</ span >< span class = "special" > );</ span >
< span class = "keyword" > template</ span >< span class = "special" > < </ span >
< span class = "keyword" > typename</ span > < span class = "identifier" > Function</ span >< span class = "special" > ,</ span >
< span class = "keyword" > class</ span > < span class = "identifier" > Sequence</ span >
< span class = "special" > > </ span >
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< span class = "keyword" > typename</ span > < a href = "../metafunctions/invoke_fobj.html" title = "
invoke_function_object" >< tt class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > invoke_function_object</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "identifier" > Function</ span >< span class = "special" > ,</ span > < span class = "identifier" > Sequence</ span > < span class = "keyword" > const</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span >
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< span class = "identifier" > invoke_function_object</ span >< span class = "special" > (</ span >< span class = "identifier" > Function</ span > < span class = "identifier" > f</ span >< span class = "special" > ,</ span > < span class = "identifier" > Sequence</ span > < span class = "keyword" > const</ span > < span class = "special" > & </ span > < span class = "identifier" > s</ span >< span class = "special" > );</ span >
</ pre >
< a name = "fusion.functional.invocation.functions.invoke_fobj.parameters" ></ a >< h6 >
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< a name = "id615507" ></ a >
< a href = "invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.parameters" > Parameters</ a >
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< a class = "link" href = "invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.parameters" > Parameters</ a >
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</ h6 >
< div class = "informaltable" >< table class = "table" >
< 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" > f</ span ></ tt >
</ p ></ td >
< td >< p >
Model of < a href = "../../concepts/poly.html" title = " Polymorphic Function
Object" > Polymorphic
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Function Object</ a >
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</ p ></ td >
< td >< p >
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The function object to call.
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</ p ></ td >
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</ tr >
< tr >
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< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > s</ span ></ tt >
</ p ></ td >
< td >< p >
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 arguments.
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</ p ></ td >
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</ tr >
</ tbody >
</ table ></ div >
< a name = "fusion.functional.invocation.functions.invoke_fobj.expression_semantics" ></ a >< h6 >
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< a name = "id615667" ></ a >
< a href = "invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.expression_semantics" > Expression
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< a class = "link" href = "invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.expression_semantics" > Expression
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Semantics</ a >
</ h6 >
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< pre class = "programlisting" >< span class = "identifier" > invoke_function_object</ span >< span class = "special" > (</ span >< span class = "identifier" > f</ span >< span class = "special" > ,</ span >< span class = "identifier" > s</ span >< span class = "special" > );</ span >
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</ pre >
< p >
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< span class = "bold" >< b > Return type</ b ></ span > : Return type of < tt class = "computeroutput" >< span class = "identifier" > f</ span ></ tt > when invoked with the elements in
< tt class = "computeroutput" >< span class = "identifier" > s</ span ></ tt > as its arguments.
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</ p >
< p >
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< span class = "bold" >< b > Semantics</ b ></ span > : Invokes < tt class = "computeroutput" >< span class = "identifier" > f</ span ></ tt >
with the elements in < tt class = "computeroutput" >< span class = "identifier" > s</ span ></ tt >
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as arguments and returns the result of the call expression.
</ p >
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< a name = "fusion.functional.invocation.functions.invoke_fobj.header" ></ a >< h6 >
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< a name = "id615801" ></ a >
< a href = "invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.header" > Header</ a >
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< a class = "link" href = "invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.header" > Header</ a >
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</ 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" > functional</ span >< span class = "special" > /</ span >< span class = "identifier" > invocation</ span >< span class = "special" > /</ span >< span class = "identifier" > invoke_function_object</ span >< span class = "special" > .</ span >< span class = "identifier" > hpp</ span >< span class = "special" > > </ span >
</ pre >
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< a name = "fusion.functional.invocation.functions.invoke_fobj.example" ></ a >< h6 >
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< a name = "id615906" ></ a >
< a href = "invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.example" > Example</ a >
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< a class = "link" href = "invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.example" > Example</ a >
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</ h6 >
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< pre class = "programlisting" >< span class = "keyword" > struct</ span > < span class = "identifier" > sub</ 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" > Sig</ span >< span class = "special" > > </ span >
< span class = "keyword" > struct</ span > < span class = "identifier" > result</ span >< span class = "special" > ;</ span >
< span class = "keyword" > template</ span > < span class = "special" > < </ span >< span class = "keyword" > class</ span > < span class = "identifier" > Self</ 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" > result</ span >< span class = "special" > < </ span > < span class = "identifier" > Self</ span >< span class = "special" > (</ span >< span class = "identifier" > T</ span >< span class = "special" > ,</ span >< span class = "identifier" > T</ span >< span class = "special" > )</ span > < span class = "special" > > </ span >
< span class = "special" > {</ span > < span class = "keyword" > typedef</ span > < span class = "keyword" > typename</ span > < span class = "identifier" > remove_reference</ span >< span class = "special" > < </ span >< span class = "identifier" > T</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span > < span class = "identifier" > type</ 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" > T</ span > < span class = "keyword" > operator</ span >< span class = "special" > ()(</ span >< span class = "identifier" > T</ span > < span class = "identifier" > lhs</ span >< span class = "special" > ,</ span > < span class = "identifier" > T</ span > < span class = "identifier" > rhs</ span >< span class = "special" > )</ span > < span class = "keyword" > const</ span >
< span class = "special" > {</ span >
< span class = "keyword" > return</ span > < span class = "identifier" > lhs</ span > < span class = "special" > -</ span > < span class = "identifier" > rhs</ span >< span class = "special" > ;</ span >
< span class = "special" > }</ span >
< span class = "special" > };</ span >
< span class = "keyword" > void</ span > < span class = "identifier" > try_it</ span >< span class = "special" > ()</ span >
< span class = "special" > {</ span >
< span class = "identifier" > sub</ span > < span class = "identifier" > f</ span >< span class = "special" > ;</ span >
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< span class = "identifier" > assert</ span >< span class = "special" > (</ span >< span class = "identifier" > f</ span >< span class = "special" > (</ span >< span class = "number" > 2</ span >< span class = "special" > ,</ span >< span class = "number" > 1</ span >< span class = "special" > )</ span > < span class = "special" > ==</ span > < span class = "identifier" > invoke_function_object</ span >< span class = "special" > (</ span >< span class = "identifier" > f</ span >< span class = "special" > ,</ span >< a href = "../../../container/generation/functions/make_vector.html" title = "make_vector" >< tt class = "computeroutput" >< span class = "identifier" > make_vector</ span ></ tt ></ a >< span class = "special" > (</ span >< span class = "number" > 2</ span >< span class = "special" > ,</ span >< span class = "number" > 1</ span >< span class = "special" > )));</ span >
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< span class = "special" > }</ span >
</ pre >
< a name = "fusion.functional.invocation.functions.invoke_fobj.see_also" ></ a >< h6 >
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< a name = "id616452" ></ a >
< a href = "invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.see_also" > See
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< a class = "link" href = "invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.see_also" > See
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also</ a >
</ h6 >
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< div class = "itemizedlist" >< ul type = "disc" >
< li >< a href = "invoke.html" title = "invoke" >< tt class = "computeroutput" >< span class = "identifier" > invoke</ span ></ tt ></ a ></ li >
< li >< a href = "invoke_proc.html" title = "
invoke_procedure" >< tt class = "computeroutput" >< span class = "identifier" > invoke_procedure</ span ></ tt ></ a ></ li >
< li >< a href = "../metafunctions/invoke_fobj.html" title = "
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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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