Would it make any sense to template the function object class below? $($i$.$e$.$ Would anyone ever need to scale anything besides doubles or their immediate built$-$in subsets?$)$

class Scale

$\{$

double scale$\_$factor;

public:

Scale$($ double actual, double desired $=100\mathrm{.}0)$

: scale$\_$factor$\{$desired $/$ actual$\}\{\}$

double operator $()($ double a $)$ const

$\{$ return a $*$ scale$\_$factor ; $\}$

void set$\_$scaling$($ double actual, double desired $)$

$\{$ scale$\_$factor $=$ desired $/$ actual ; return ; $\}$

void set$\_$scaling$($ double multiple $)$

$\{$ scale$\_$factor $=$ multiple ; return ; $\}$

$\}$;