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< a name = "fusion.functional.invocation.functions.invoke" > < / a > < a href = "invoke.html" title = "invoke" > invoke< / a > < / h5 > < / div > < / div > < / div >
< a name = "fusion.functional.invocation.functions.invoke.description" > < / a > < h6 >
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< a name = "id657208" > < / a >
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< a href = "invoke.html#fusion.functional.invocation.functions.invoke.description" > Description< / a >
< / h6 >
< p >
Calls a < a href = "../../concepts/def_callable.html" title = " Deferred
Callable Object">Deferred
Callable Object< / a > with the arguments from a < a href = "../../../sequence.html" title = "Sequence" > Sequence< / a > .
< / p >
< p >
The first template parameter can be specialized explicitly to avoid copying
and/or to control the const qualification of a function object.
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If the target function is a pointer to a class members, the corresponding
object can be specified as a reference, pointer, or smart pointer. In
case of the latter, a freestanding < tt class = "literal" > get_pointer< / tt > function
must be defined (Boost provides this function for < tt class = "literal" > std::auto_ptr< / tt >
and < a href = "http://www.boost.org/libs/smart_ptr/shared_ptr.htm" target = "_top" > < tt class = "computeroutput" > < span class = "identifier" > boost< / span > < span class = "special" > ::< / span > < span class = "identifier" > shared_ptr< / span > < / tt > < / a > ).
< / p >
< a name = "fusion.functional.invocation.functions.invoke.synopsis" > < / a > < h6 >
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< a name = "id657311" > < / a >
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< a href = "invoke.html#fusion.functional.invocation.functions.invoke.synopsis" > Synopsis< / a >
< / h6 >
< 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 >
< span class = "keyword" > typename< / span > < a href = "../metafunctions/invoke.html" title = "invoke" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > invoke< / 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 >
< span class = "identifier" > invoke< / 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 href = "../metafunctions/invoke.html" title = "invoke" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > invoke< / 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< / 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.parameters" > < / a > < h6 >
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< a name = "id657689" > < / a >
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< a href = "invoke.html#fusion.functional.invocation.functions.invoke.parameters" > Parameters< / a >
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< div class = "informaltable" > < table class = "table" >
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Parameter
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< / th >
< th >
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Requirement
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< / th >
< th >
< p >
Description
< / p >
< / th >
< / tr > < / thead >
< tbody >
< tr >
< td >
< p >
< tt class = "computeroutput" > < span class = "identifier" > f< / span > < / tt >
< / p >
< / td >
< td >
< p >
A < a href = "../../concepts/def_callable.html" title = " Deferred
Callable Object">Deferred
Callable Object< / a >
< / p >
< / td >
< td >
< p >
The function to call.
< / p >
< / td >
< / tr >
< tr >
< td >
< p >
< tt class = "computeroutput" > < span class = "identifier" > s< / span > < / tt >
< / p >
< / td >
< td >
< p >
A < a href = "../../../sequence/concepts/forward_sequence.html" title = "Forward
Sequence">Forward
Sequence< / a >
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< / td >
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The arguments.
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< a name = "fusion.functional.invocation.functions.invoke.expression_semantics" > < / a > < h6 >
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< a name = "id657851" > < / a >
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< a href = "invoke.html#fusion.functional.invocation.functions.invoke.expression_semantics" > Expression
Semantics< / a >
< / h6 >
< pre class = "programlisting" >
< span class = "identifier" > invoke< / span > < span class = "special" > (< / span > < span class = "identifier" > f< / span > < span class = "special" > ,< / span > < span class = "identifier" > s< / span > < span class = "special" > );< / span >
< / pre >
< p >
< 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.
< / p >
< p >
< 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 >
as arguments and returns the result of the call expression.
< / p >
< p >
/functional/invocation/invoke.hpp>
< / p >
< a name = "fusion.functional.invocation.functions.invoke.example" > < / a > < h6 >
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< a name = "id657993" > < / a >
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< a href = "invoke.html#fusion.functional.invocation.functions.invoke.example" > Example< / a >
< / h6 >
< pre class = "programlisting" >
< a href = "http://www.sgi.com/tech/stl/plus.html" target = "_top" > < tt class = "computeroutput" > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > plus< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "keyword" > int< / span > < span class = "special" > > < / span > < span class = "identifier" > add< / span > < span class = "special" > ;< / span >
< span class = "identifier" > assert< / span > < span class = "special" > (< / span > < span class = "identifier" > invoke< / span > < span class = "special" > (< / span > < span class = "identifier" > add< / 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" > 1< / span > < span class = "special" > ,< / span > < span class = "number" > 1< / span > < span class = "special" > ))< / span > < span class = "special" > ==< / span > < span class = "number" > 2< / span > < span class = "special" > );< / span >
< / pre >
< a name = "fusion.functional.invocation.functions.invoke.see_also" > < / a > < h6 >
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< a name = "id658162" > < / a >
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< a href = "invoke.html#fusion.functional.invocation.functions.invoke.see_also" > See
also< / a >
< / h6 >
< div class = "itemizedlist" > < ul type = "disc" >
< li > < a href = "invoke_proc.html" title = "
invoke_procedure">< tt class = "computeroutput" > < span class = "identifier" > invoke_procedure< / span > < / tt > < / a > < / li >
< li > < a href = "invoke_fobj.html" title = "
invoke_function_object">< tt class = "computeroutput" > < span class = "identifier" > invoke_function_object< / span > < / tt > < / a > < / li >
< li > < a href = "../metafunctions/invoke.html" title = "invoke" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > invoke< / span > < / tt > < / a > < / li >
< li > < a href = "../../adapters/fused.html" title = "fused" > < tt class = "computeroutput" > < span class = "identifier" > fused< / span > < / tt > < / a > < / li >
< / ul > < / div >
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< td align = "right" > < div class = "copyright-footer" > Copyright <20> 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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