cpp-lazy-stream/include/stream/source.hpp

#pragma once

#include <iterator>

namespace stream { namespace detail {
  template <typename C> class source_stream {
  public:
    explicit source_stream(C && cont) : source_(std::forward<C>(cont)) {}

    auto begin() { return iterator(source_.begin()); }
    auto end() { return iterator(source_.end()); }

  private:
    C source_;
  };

  template <typename It> class range_stream {
  public:
    explicit range_stream(It b, It e) : begin_(b), end_(e) {}

    auto begin() { return iterator(begin_); }
    auto end() { return iterator(end_); }

  private:
    It begin_, end_;
  };
}}