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+/* Copyright 2003-2013 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See http://www.boost.org/libs/multi_index for library home page.
+ */
+
+#ifndef BOOST_MULTI_INDEX_DETAIL_ITER_ADAPTOR_HPP
+#define BOOST_MULTI_INDEX_DETAIL_ITER_ADAPTOR_HPP
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
+#include <boost/mpl/apply.hpp>
+#include <boost/operators.hpp>
+
+namespace boost{
+
+namespace multi_index{
+
+namespace detail{
+
+/* Poor man's version of boost::iterator_adaptor. Used instead of the
+ * original as compile times for the latter are significantly higher.
+ * The interface is not replicated exactly, only to the extent necessary
+ * for internal consumption.
+ */
+
+/* NB. The purpose of the (non-inclass) global operators ==, < and - defined
+ * above is to partially alleviate a problem of MSVC++ 6.0 by * which
+ * friend-injected operators on T are not visible if T is instantiated only
+ * in template code where T is a dependent type.
+ */
+
+class iter_adaptor_access
+{
+public:
+  template<class Class>
+    static typename Class::reference dereference(const Class& x)
+  {
+    return x.dereference();
+  }
+
+  template<class Class>
+  static bool equal(const Class& x,const Class& y)
+  {
+    return x.equal(y);
+  }
+
+  template<class Class>
+  static void increment(Class& x)
+  {
+    x.increment();
+  }
+
+  template<class Class>
+  static void decrement(Class& x)
+  {
+    x.decrement();
+  }
+
+  template<class Class>
+  static void advance(Class& x,typename Class::difference_type n)
+  {
+    x.advance(n);
+  }
+
+  template<class Class>
+  static typename Class::difference_type distance_to(
+    const Class& x,const Class& y)
+  {
+    return x.distance_to(y);
+  }
+};
+
+template<typename Category>
+struct iter_adaptor_selector;
+
+template<class Derived,class Base>
+class forward_iter_adaptor_base:
+  public forward_iterator_helper<
+    Derived,
+    typename Base::value_type,
+    typename Base::difference_type,
+    typename Base::pointer,
+    typename Base::reference>
+{
+public:
+  typedef typename Base::reference reference;
+
+  reference operator*()const
+  {
+    return iter_adaptor_access::dereference(final());
+  }
+
+  friend bool operator==(const Derived& x,const Derived& y)
+  {
+    return iter_adaptor_access::equal(x,y);
+  }
+
+  Derived& operator++()
+  {
+    iter_adaptor_access::increment(final());
+    return final();
+  }
+
+private:
+  Derived& final(){return *static_cast<Derived*>(this);}
+  const Derived& final()const{return *static_cast<const Derived*>(this);}
+};
+
+template<class Derived,class Base>
+bool operator==(
+  const forward_iter_adaptor_base<Derived,Base>& x,
+  const forward_iter_adaptor_base<Derived,Base>& y)
+{
+  return iter_adaptor_access::equal(
+    static_cast<const Derived&>(x),static_cast<const Derived&>(y));
+}
+
+template<>
+struct iter_adaptor_selector<std::forward_iterator_tag>
+{
+  template<class Derived,class Base>
+  struct apply
+  {
+    typedef forward_iter_adaptor_base<Derived,Base> type;
+  };
+};
+
+template<class Derived,class Base>
+class bidirectional_iter_adaptor_base:
+  public bidirectional_iterator_helper<
+    Derived,
+    typename Base::value_type,
+    typename Base::difference_type,
+    typename Base::pointer,
+    typename Base::reference>
+{
+public:
+  typedef typename Base::reference reference;
+
+  reference operator*()const
+  {
+    return iter_adaptor_access::dereference(final());
+  }
+
+  friend bool operator==(const Derived& x,const Derived& y)
+  {
+    return iter_adaptor_access::equal(x,y);
+  }
+
+  Derived& operator++()
+  {
+    iter_adaptor_access::increment(final());
+    return final();
+  }
+
+  Derived& operator--()
+  {
+    iter_adaptor_access::decrement(final());
+    return final();
+  }
+
+private:
+  Derived& final(){return *static_cast<Derived*>(this);}
+  const Derived& final()const{return *static_cast<const Derived*>(this);}
+};
+
+template<class Derived,class Base>
+bool operator==(
+  const bidirectional_iter_adaptor_base<Derived,Base>& x,
+  const bidirectional_iter_adaptor_base<Derived,Base>& y)
+{
+  return iter_adaptor_access::equal(
+    static_cast<const Derived&>(x),static_cast<const Derived&>(y));
+}
+
+template<>
+struct iter_adaptor_selector<std::bidirectional_iterator_tag>
+{
+  template<class Derived,class Base>
+  struct apply
+  {
+    typedef bidirectional_iter_adaptor_base<Derived,Base> type;
+  };
+};
+
+template<class Derived,class Base>
+class random_access_iter_adaptor_base:
+  public random_access_iterator_helper<
+    Derived,
+    typename Base::value_type,
+    typename Base::difference_type,
+    typename Base::pointer,
+    typename Base::reference>
+{
+public:
+  typedef typename Base::reference       reference;
+  typedef typename Base::difference_type difference_type;
+
+  reference operator*()const
+  {
+    return iter_adaptor_access::dereference(final());
+  }
+
+  friend bool operator==(const Derived& x,const Derived& y)
+  {
+    return iter_adaptor_access::equal(x,y);
+  }
+
+  friend bool operator<(const Derived& x,const Derived& y)
+  {
+    return iter_adaptor_access::distance_to(x,y)>0;
+  }
+
+  Derived& operator++()
+  {
+    iter_adaptor_access::increment(final());
+    return final();
+  }
+
+  Derived& operator--()
+  {
+    iter_adaptor_access::decrement(final());
+    return final();
+  }
+
+  Derived& operator+=(difference_type n)
+  {
+    iter_adaptor_access::advance(final(),n);
+    return final();
+  }
+
+  Derived& operator-=(difference_type n)
+  {
+    iter_adaptor_access::advance(final(),-n);
+    return final();
+  }
+
+  friend difference_type operator-(const Derived& x,const Derived& y)
+  {
+    return iter_adaptor_access::distance_to(y,x);
+  }
+
+private:
+  Derived& final(){return *static_cast<Derived*>(this);}
+  const Derived& final()const{return *static_cast<const Derived*>(this);}
+};
+
+template<class Derived,class Base>
+bool operator==(
+  const random_access_iter_adaptor_base<Derived,Base>& x,
+  const random_access_iter_adaptor_base<Derived,Base>& y)
+{
+  return iter_adaptor_access::equal(
+    static_cast<const Derived&>(x),static_cast<const Derived&>(y));
+}
+
+template<class Derived,class Base>
+bool operator<(
+  const random_access_iter_adaptor_base<Derived,Base>& x,
+  const random_access_iter_adaptor_base<Derived,Base>& y)
+{
+  return iter_adaptor_access::distance_to(
+    static_cast<const Derived&>(x),static_cast<const Derived&>(y))>0;
+}
+
+template<class Derived,class Base>
+typename random_access_iter_adaptor_base<Derived,Base>::difference_type
+operator-(
+  const random_access_iter_adaptor_base<Derived,Base>& x,
+  const random_access_iter_adaptor_base<Derived,Base>& y)
+{
+  return iter_adaptor_access::distance_to(
+    static_cast<const Derived&>(y),static_cast<const Derived&>(x));
+}
+
+template<>
+struct iter_adaptor_selector<std::random_access_iterator_tag>
+{
+  template<class Derived,class Base>
+  struct apply
+  {
+    typedef random_access_iter_adaptor_base<Derived,Base> type;
+  };
+};
+
+template<class Derived,class Base>
+struct iter_adaptor_base
+{
+  typedef iter_adaptor_selector<
+    typename Base::iterator_category> selector;
+  typedef typename mpl::apply2<
+    selector,Derived,Base>::type      type;
+};
+
+template<class Derived,class Base>
+class iter_adaptor:public iter_adaptor_base<Derived,Base>::type
+{
+protected:
+  iter_adaptor(){}
+  explicit iter_adaptor(const Base& b_):b(b_){}
+
+  const Base& base_reference()const{return b;}
+  Base&       base_reference(){return b;}
+
+private:
+  Base b;
+};
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif