cpp-useful-iterators/include/iterator/iterator_fwd.hpp

//
//  iterator_fwd.hpp
//  iterator
//
//  Created by Sam Jaffe on 2/18/17.
//

#pragma once

#include <cstdlib>
#include <iterator>

namespace iterator::recursive {
struct unbounded;
template <size_t N, size_t I = 1> struct bounded;
template <typename, typename = unbounded> class rimpl;
}

namespace iterator {
template <typename> class end_aware_iterator;
template <typename, bool = false> class filter_iterator;
template <typename> class joining_iterator;
template <typename> class unkeyed_iterator;
template <typename...> class zip_iterator;

template <typename Iter> using recursive_iterator = recursive::rimpl<Iter>;
template <typename Iter, std::size_t N>
using recursive_iterator_n = recursive::rimpl<Iter, recursive::bounded<N>>;

template <typename> class facade;
template <typename Iter, typename,
          typename = typename std::iterator_traits<Iter>::iterator_category>
class proxy;

template <typename C> using iter = decltype(std::begin(std::declval<C>()));
}