You can’t sort a pair of zip_iterators.
Firstly, make_zip_iterator takes a tuple of iterators as input, so you could call:
boost::make_zip_iterator(boost::make_tuple( ... ))
but that won’t compile either, because keys
and keys+N
doesn’t have the same type. We need to force keys
to become a pointer:
std::sort(boost::make_zip_iterator(boost::make_tuple(+keys, +values)),
boost::make_zip_iterator(boost::make_tuple(keys+N, values+N)));
this will compile, but the sorted result is still wrong, because a zip_iterator only models a Readable iterator, but std::sort
also needs the input to be Writable as described here, so you can’t sort using zip_iterator.