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From: Jeff Paquette (paquette_at_[hidden])
Date: 2001-01-09 17:01:07

Stroustrup's book said that it was accidentally dropped from the standard
and provides an implementation:

  // copy_if was dropped from the standard library by accident.
  template<typename In, typename Out, typename Pred>
  Out copy_if(In first, In last, Out res, Pred Pr)
    while (first != last) {
      if (Pr(*first))
        *res++ = *first;

    return res;

Jeff Paquette
paquette at
> -----Original Message-----
> From: Dave Abrahams [mailto:abrahams_at_[hidden]]
> Sent: Tuesday, January 09, 2001 4:54 PM
> To: boost_at_[hidden]
> Subject: [boost] copy_if
> I just went through the SGI STL site looking for an algorithm fitting
> the following description:
>    Given a sequence s, a predicate p, and an output iterator r,
> copies the elements e of s for which p(e) is true to the range
> beginning with r.
> I was surprised not to find it. Have I missed something obvious? Time
> for boost/algorithm.hpp?
> -Dave
> P.S. yes, I know there are other obvious but missing algorithms.

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