id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
10894,"Add an adaptor to iterate a range in pairs of (current element, next element)",Matthäus Brandl (brandl.matthaeus@… com),Neil Groves,"An often needed functionality is iterating a range and accessing the current and next element of the range.

Currently this can be done as follows:
{{{#!C++
assert(someVec.size > 1);
for(auto const & pair, boost::make_iterator_range(
    boost::make_zip_iterator(
        boost::make_tuple(
            someVec.cbegin(), std::next(someVec.cbegin()))),
    boost::make_zip_iterator(
        boost::make_tuple(
            std::prev(someVec.cend()), someVec.cend())))
        )
{
    auto current = boost::get<0>(pair);
    auto next    = boost::get<1>(pair);
}
}}}

An adaptor would strongly increase readability:
{{{#!C++
assert(someVec.size > 1);
using boost::adaptors::operator|;
for(auto const & pair, someVec | boost::adaptors::paired())
{
    pair.current();
    pair.next();
}
}}}

Of course the difference between current and next could be made customizable as well.",Feature Requests,new,To Be Determined,range,Boost Development Trunk,Not Applicable,,range adaptor pairwise,