cpp-lazy-stream/streams/source.hpp

#pragma once

namespace stream {
  namespace detail {
    namespace source {
      template <typename C>
      class iterator : public iterator_impl<typename C::value_type> {
      public:
        typedef iterator_impl<typename C::value_type> super;
        explicit iterator(typename C::iterator it) : impl_(it) {}
        ~iterator() {}
        typename C::value_type operator*() override { return *impl_; }
        DELEGATE_ITERATOR_IMPL(impl_)
      private:
        typename C::const_iterator impl_;
      };
    }
    
    template <typename C>
    class source_stream : public stream_impl<typename C::value_type> {
    public:
      typedef typename C::value_type value_type;
      
      explicit source_stream(C const& cont) : source_(cont) {}
      explicit source_stream(C && cont) : source_(std::forward(cont)) {}
      ~source_stream() override {}
      iterator<value_type> begin() override { return {new source::iterator<C>{source_.begin()}}; }
      iterator<value_type> end() override { return {new source::iterator<C>{source_.end()}}; }
    private:
      C source_;
    };
  }
  
  template <typename C>
  detail::stream_base<typename C::value_type> make_stream(C const& cont) {
    return {std::make_shared<detail::source_stream<C>>(cont)};
  }
}