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/gist:287791
Created Jan 27, 2010

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namespace result_of
{
template<class R1, class R2> struct chain
{
typedef typename
boost::range_detail::chain_iterator<
typename boost::range_const_iterator<R1>::type,
typename boost::range_const_iterator<R2>::type,
typename boost::add_const<typename boost::range_value<R1 const>::type>::type>
iterator;
typedef typename boost::iterator_range<iterator> type;
};
}
template<class R>
struct Chainer : public boost::iterator_range<typename R::const_iterator>
{
typedef boost::iterator_range<typename R::const_iterator> Base;
Chainer(R const & r) : Base(r)
{ }
template<class OtherR>
Chainer<typename result_of::chain<Base, OtherR>::type>
operator()(OtherR const & other) const
{
return Chainer<typename result_of::chain<Base, OtherR>::type>(
boost::chain(*this, other));
}
};
template<class R1, class R2>
typename result_of::chain<R1, Chainer<R2> >::type
operator|(R1 const & r1, Chainer<R2> const & r2)
{
return boost::chain(r1, r2);
}
template<class R>
Chainer<R> chain(R const & r)
{
return Chainer<R>(r);
}
void test()
{
namespace boost;
vector<int> a = force(counting_range(0, 5));
deque<int> b = force(counting_range(10, 15));
list<int> c = force(counting_range(20, 25));
copy(a | chain(b) | chain(c),
ostream_iterator<int>(cout, "\n"));
copy(chain(a)(b)(c),
ostream_iterator<int>(cout, "\n"));
}
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