thirdparty/yaml-cpp-yaml-cpp-0.5.3/include/yaml-cpp/node/detail/iterator.h

#ifndef VALUE_DETAIL_ITERATOR_H_62B23520_7C8E_11DE_8A39_0800200C9A66
#define VALUE_DETAIL_ITERATOR_H_62B23520_7C8E_11DE_8A39_0800200C9A66

#if defined(_MSC_VER) ||                                            \
    (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || \
     (__GNUC__ >= 4))  // GCC supports "pragma once" correctly since 3.4
#pragma once
#endif

#include "yaml-cpp/dll.h"
#include "yaml-cpp/node/ptr.h"
#include "yaml-cpp/node/detail/node_iterator.h"
#include <boost/iterator/iterator_adaptor.hpp>
#include <boost/utility.hpp>

namespace YAML {
namespace detail {
struct iterator_value;

template <typename V>
class iterator_base
    : public boost::iterator_adaptor<iterator_base<V>, node_iterator, V,
                                     std::forward_iterator_tag, V> {
 private:
  template <typename>
  friend class iterator_base;
  struct enabler {};
  typedef typename iterator_base::base_type base_type;

 public:
  typedef typename iterator_base::value_type value_type;

 public:
  iterator_base() {}
  explicit iterator_base(base_type rhs, shared_memory_holder pMemory)
      : iterator_base::iterator_adaptor_(rhs), m_pMemory(pMemory) {}

  template <class W>
  iterator_base(const iterator_base<W>& rhs,
                typename boost::enable_if<boost::is_convertible<W*, V*>,
                                          enabler>::type = enabler())
      : iterator_base::iterator_adaptor_(rhs.base()),
        m_pMemory(rhs.m_pMemory) {}

 private:
  friend class boost::iterator_core_access;

  void increment() { this->base_reference() = boost::next(this->base()); }

  value_type dereference() const {
    const typename base_type::value_type& v = *this->base();
    if (v.pNode)
      return value_type(Node(*v, m_pMemory));
    if (v.first && v.second)
      return value_type(Node(*v.first, m_pMemory), Node(*v.second, m_pMemory));
    return value_type();
  }

 private:
  shared_memory_holder m_pMemory;
};
}
}

#endif  // VALUE_DETAIL_ITERATOR_H_62B23520_7C8E_11DE_8A39_0800200C9A66