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\item[\label{todo__todo000001}%
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Class \hyperlink{classfilval_1_1WrapperVector}{filval\+:\+:Wrapper\+Vector$<$ T $>$} ]avoid an unneccessary copy and set the vectors data directly.  
\item[\label{todo__todo000002}%
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Class \hyperlink{classfilval_1_1ZipMapFour}{filval\+:\+:Zip\+Map\+Four$<$ R, T $>$} ]find way to implement for arbitrary number(and possibly type) of vector inputs. 
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