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< div class = "section" title = "invoke_function_object" >
< div class = "titlepage" >< div >< div >< h5 class = "title" >
< a name = "fusion.functional.invocation.functions.invoke_fobj" ></ a >< a class = "link" href = "invoke_fobj.html" title = "invoke_function_object" >
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invoke_function_object</ a >
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</ h5 ></ div ></ div ></ div >
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< a name = "fusion.functional.invocation.functions.invoke_fobj.description" ></ a >< h6 >
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< a name = "id824931" ></ 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 class = "link" href = "../../concepts/poly.html" title = "Polymorphic Function Object" > Polymorphic Function
Object</ a > with the arguments from a < a class = "link" 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 = "id824974" ></ 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 >
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< span class = "keyword" > class</ span > < span class = "identifier" > Sequence</ span >
< span class = "special" > > </ span >
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< span class = "keyword" > typename</ span > < a class = "link" href = "../metafunctions/invoke_fobj.html" title = "invoke_function_object" >< code class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > invoke_function_object</ span ></ code ></ 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 >
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< span class = "keyword" > typename</ span > < span class = "identifier" > Function</ span >< span class = "special" > ,</ span >
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< span class = "keyword" > class</ span > < span class = "identifier" > Sequence</ span >
< span class = "special" > > </ span >
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< span class = "keyword" > typename</ span > < a class = "link" href = "../metafunctions/invoke_fobj.html" title = "invoke_function_object" >< code class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > invoke_function_object</ span ></ code ></ 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 = "id825243" ></ 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 >
< code class = "computeroutput" >< span class = "identifier" > f</ span ></ code >
</ p >
</ td >
< td >
< p >
Model of < a class = "link" 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 >
< code class = "computeroutput" >< span class = "identifier" > s</ span ></ code >
</ p >
</ td >
< td >
< p >
Model of < a class = "link" 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 = "id825367" ></ a >
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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" >< strong > Return type</ strong ></ span > : Return type of < code class = "computeroutput" >< span class = "identifier" > f</ span ></ code > when invoked with the elements in
< code class = "computeroutput" >< span class = "identifier" > s</ span ></ code > as its arguments.
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</ p >
< p >
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< span class = "bold" >< strong > Semantics</ strong ></ span > : Invokes < code class = "computeroutput" >< span class = "identifier" > f</ span ></ code >
with the elements in < code class = "computeroutput" >< span class = "identifier" > s</ span ></ code >
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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 = "id825455" ></ 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 = "id825529" ></ 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 >
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< 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 >
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< 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 class = "link" href = "../../../container/generation/functions/make_vector.html" title = "make_vector" >< code class = "computeroutput" >< span class = "identifier" > make_vector</ span ></ code ></ 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 = "id825936" ></ a >
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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 class = "itemizedlist" type = "disc" >
< li class = "listitem" >< a class = "link" href = "invoke.html" title = "invoke" >< code class = "computeroutput" >< span class = "identifier" > invoke</ span ></ code ></ a ></ li >
< li class = "listitem" >< a class = "link" href = "invoke_proc.html" title = "invoke_procedure" >< code class = "computeroutput" >< span class = "identifier" > invoke_procedure</ span ></ code ></ a ></ li >
< li class = "listitem" >< a class = "link" href = "../metafunctions/invoke_fobj.html" title = "invoke_function_object" >< code class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > invoke_function_object</ span ></ code ></ a ></ li >
< li class = "listitem" >< a class = "link" href = "../../adapters/fused_function_object.html" title = "fused_function_object" >< code class = "computeroutput" >< span class = "identifier" > fused_function_object</ span ></ code ></ a ></ li >
< li class = "listitem" >< a class = "link" href = "../../generation/functions/mk_fused_fobj.html" title = "make_fused_function_object" >< code class = "computeroutput" >< span class = "identifier" > make_fused_function_object</ span ></ code ></ a ></ li >
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</ ul ></ div >
</ 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 > )
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</ p >
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</ tr ></ table >
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