on Thu Oct 27 2011, Fernando Pelliccioni <fpelliccioni-AT-gmail.com> wrote:
Is there interest in adding a Top-Bounded adaptor into Boost.Range ?
Example:
using namespace boost::adaptors; using namespace boost::assign;
std::vector<int> input; input += 1,2,3,4,5,6,7,8,9;
boost::copy( input | bounded(0), std::ostream_iterator<int>(std::cout, ",")); // prints nothing boost::copy( input | bounded(1), std::ostream_iterator<int>(std::cout, ",")); // prints 1, boost::copy( input | bounded(2), std::ostream_iterator<int>(std::cout, ",")); // prints 1,2, boost::copy( input | bounded(8), std::ostream_iterator<int>(std::cout, ",")); // prints 1,2,3,4,5,7,8,
Is there interest in this for Boost?
There is an obvious generalization that stops the range when a predicate is satisfied, e.g. boost::copy( input | until(_1 == 8), std::ostream_iterator<int>(std::cout, ",")); That leads me to believe that the proper behavior of the less-generalized component, which you call "bounded," is to stop the range when the element reaches the bound, rather than including it. -- Dave Abrahams BoostPro Computing http://www.boostpro.com