From: "Paul Ranson" 

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"Geo"  wrote in message
news:41918a94$3{at}w3.nls.net...
> That's the other difference I saw with a type vs a class, a type =
defines
> certain operators and not others, it limits things. For example with
> unsigned int you are limited in that you can't use abs.

'abs' is a function in the library rather than an operator. It would be =
completely pointless to call it for an unsigned value....

But should you want to, here it is,

#include 

template  T geos_abs ( T t ) {
   if ( std::numeric_limits::is_signed )
      return abs ( t ) ;
   return t ;
}

The compiler should be clever enough to optimise it away completely in = all cases.

Paul
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"Geo" <mailto:georger{at}nls.net">
size=3D2>georger{at}nls.net> wrote in message =
news:41918a94$3{at}w3.nls.net...
> That's the other difference I saw
with a type =
vs a class,=20
a type defines> certain operators and not others, it
limits = things. For=20
example with> unsigned int you are limited in that you
can't use=20 abs.
'abs' is a function in the library rather than an =
operator. It=20
would be completely pointless to call it for an unsigned =
value....
 
But should you want to, here it
is,
 
#include=20
<limits>
 
template < =
typename T >=20
T geos_abs ( T t )
{
   if =
(=20
std::numeric_limits<T>::is_signed )
      return abs (
t ) ;
   =
return t=20
;
}
 
The compiler should be clever enough to optimise it =
away=20
completely in all cases.
 
Paul

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