//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2005-2013. 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/container for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_CONTAINER_DETAIL_UTILITIES_HPP
#define BOOST_CONTAINER_DETAIL_UTILITIES_HPP

#ifndef BOOST_CONFIG_HPP
#  include <boost/config.hpp>
#endif

#if defined(BOOST_HAS_PRAGMA_ONCE)
#  pragma once
#endif

// container
#include <boost/container/allocator_traits.hpp>
// container/detail
#include <boost/container/detail/iterator.hpp>
#include <boost/container/detail/iterator_to_raw_pointer.hpp>
#include <boost/container/detail/mpl.hpp>
#include <boost/container/detail/type_traits.hpp>
// move
#include <boost/move/adl_move_swap.hpp>
#include <boost/move/iterator.hpp>
#include <boost/move/utility_core.hpp>
// other
#include <boost/core/no_exceptions_support.hpp>
// std
#include <cstring> //for emmove/memcpy

namespace boost {
namespace container {
namespace container_detail {

template<class I>
struct are_elements_contiguous
{
   static const bool value = false;
};

/////////////////////////
//    raw pointers
/////////////////////////

template<class T>
struct are_elements_contiguous<T*>
{
   static const bool value = true;
};

/////////////////////////
//    move iterators
/////////////////////////

template<class It>
struct are_elements_contiguous< ::boost::move_iterator<It> >
   : are_elements_contiguous<It>
{};

/////////////////////////
//    predeclarations
/////////////////////////

#ifndef BOOST_CONTAINER_VECTOR_ITERATOR_IS_POINTER

template<class Pointer>
class vector_iterator;

template<class Pointer>
class vector_const_iterator;

#endif   //BOOST_CONTAINER_VECTOR_ITERATOR_IS_POINTER

}  //namespace container_detail {
}  //namespace container {

namespace interprocess {

template <class PointedType, class DifferenceType, class OffsetType, std::size_t OffsetAlignment>
class offset_ptr;

}  //namespace interprocess {

namespace container {

namespace container_detail {

/////////////////////////
//vector_[const_]iterator
/////////////////////////

#ifndef BOOST_CONTAINER_VECTOR_ITERATOR_IS_POINTER

template<class Pointer>
struct are_elements_contiguous<boost::container::container_detail::vector_iterator<Pointer> >
{
   static const bool value = true;
};

template<class Pointer>
struct are_elements_contiguous<boost::container::container_detail::vector_const_iterator<Pointer> >
{
   static const bool value = true;
};

#endif   //BOOST_CONTAINER_VECTOR_ITERATOR_IS_POINTER

/////////////////////////
//    offset_ptr
/////////////////////////

template <class PointedType, class DifferenceType, class OffsetType, std::size_t OffsetAlignment>
struct are_elements_contiguous< ::boost::interprocess::offset_ptr<PointedType, DifferenceType, OffsetType, OffsetAlignment> >
{
   static const bool value = true;
};

template <typename I, typename O>
struct are_contiguous_and_same
   : boost::move_detail::and_
      < are_elements_contiguous<I>
      , are_elements_contiguous<O>
      , is_same< typename remove_const< typename ::boost::container::iterator_traits<I>::value_type >::type
               , typename ::boost::container::iterator_traits<O>::value_type
               >
      >
{};

template <typename I, typename O>
struct is_memtransfer_copy_assignable
   : boost::move_detail::and_
      < are_contiguous_and_same<I, O>
      , container_detail::is_trivially_copy_assignable< typename ::boost::container::iterator_traits<I>::value_type >
      >
{};

template <typename I, typename O>
struct is_memtransfer_copy_constructible
   : boost::move_detail::and_
      < are_contiguous_and_same<I, O>
      , container_detail::is_trivially_copy_constructible< typename ::boost::container::iterator_traits<I>::value_type >
      >
{};

template <typename I, typename O, typename R>
struct enable_if_memtransfer_copy_constructible
   : enable_if<container_detail::is_memtransfer_copy_constructible<I, O>, R>
{};

template <typename I, typename O, typename R>
struct disable_if_memtransfer_copy_constructible
   : disable_if<container_detail::is_memtransfer_copy_constructible<I, O>, R>
{};

template <typename I, typename O, typename R>
struct enable_if_memtransfer_copy_assignable
   : enable_if<container_detail::is_memtransfer_copy_assignable<I, O>, R>
{};

template <typename I, typename O, typename R>
struct disable_if_memtransfer_copy_assignable
   : disable_if<container_detail::is_memtransfer_copy_assignable<I, O>, R>
{};

template
   <typename I, // I models InputIterator
    typename F> // F models ForwardIterator
inline F memmove(I f, I l, F r) BOOST_NOEXCEPT_OR_NOTHROW
{
   typedef typename boost::container::iterator_traits<I>::value_type value_type;
   typename boost::container::iterator_traits<I>::difference_type n = boost::container::iterator_distance(f, l);
   if(n){
      std::memmove((iterator_to_raw_pointer)(r), (iterator_to_raw_pointer)(f), sizeof(value_type)*n);
      boost::container::iterator_advance(r, n);
   }
   return r;
}

template
   <typename I, // I models InputIterator
    typename F> // F models ForwardIterator
F memmove_n(I f, typename boost::container::iterator_traits<I>::difference_type n, F r) BOOST_NOEXCEPT_OR_NOTHROW
{
   typedef typename boost::container::iterator_traits<I>::value_type value_type;
   if(n){
      std::memmove((iterator_to_raw_pointer)(r), (iterator_to_raw_pointer)(f), sizeof(value_type)*n);
      boost::container::iterator_advance(r, n);
   }
   return r;
}

template
   <typename I, // I models InputIterator
    typename F> // F models ForwardIterator
I memmove_n_source(I f, typename boost::container::iterator_traits<I>::difference_type n, F r) BOOST_NOEXCEPT_OR_NOTHROW
{
   if(n){
      typedef typename boost::container::iterator_traits<I>::value_type value_type;
      std::memmove((iterator_to_raw_pointer)(r), (iterator_to_raw_pointer)(f), sizeof(value_type)*n);
      boost::container::iterator_advance(f, n);
   }
   return f;
}

template
   <typename I, // I models InputIterator
    typename F> // F models ForwardIterator
I memmove_n_source_dest(I f, typename boost::container::iterator_traits<I>::difference_type n, F &r) BOOST_NOEXCEPT_OR_NOTHROW
{
   typedef typename boost::container::iterator_traits<I>::value_type value_type;
   if(n){
      std::memmove((iterator_to_raw_pointer)(r), (iterator_to_raw_pointer)(f), sizeof(value_type)*n);
      boost::container::iterator_advance(f, n);
      boost::container::iterator_advance(r, n);
   }
   return f;
}

template <typename O>
struct is_memzero_initializable
{
   typedef typename ::boost::container::iterator_traits<O>::value_type value_type;
   static const bool value = are_elements_contiguous<O>::value &&
      (  container_detail::is_integral<value_type>::value || container_detail::is_enum<value_type>::value
      #if defined(BOOST_CONTAINER_MEMZEROED_POINTER_IS_NULL)
      || container_detail::is_pointer<value_type>::value
      #endif
      #if defined(BOOST_CONTAINER_MEMZEROED_FLOATING_POINT_IS_ZERO)
      || container_detail::is_floating_point<value_type>::value
      #endif
      #if defined(BOOST_CONTAINER_MEMZEROED_FLOATING_POINT_IS_ZERO) && defined(BOOST_CONTAINER_MEMZEROED_POINTER_IS_NULL)
      || container_detail::is_pod<value_type>::value
      #endif
      );
};

template <typename O, typename R>
struct enable_if_memzero_initializable
   : enable_if_c<container_detail::is_memzero_initializable<O>::value, R>
{};

template <typename O, typename R>
struct disable_if_memzero_initializable
   : enable_if_c<!container_detail::is_memzero_initializable<O>::value, R>
{};

template <typename I, typename R>
struct enable_if_trivially_destructible
   : enable_if_c < false/*container_detail::is_trivially_destructible
                  <typename boost::container::iterator_traits<I>::value_type>::value*/
               , R>
{};

template <typename I, typename R>
struct disable_if_trivially_destructible
   : enable_if_c <true/*!container_detail::is_trivially_destructible
                  <typename boost::container::iterator_traits<I>::value_type>::value*/
               , R>
{};

}  //namespace container_detail {

//////////////////////////////////////////////////////////////////////////////
//
//                               uninitialized_move_alloc
//
//////////////////////////////////////////////////////////////////////////////


//! <b>Effects</b>:
//!   \code
//!   for (; f != l; ++r, ++f)
//!      allocator_traits::construct(a, &*r, boost::move(*f));
//!   \endcode
//!
//! <b>Returns</b>: r
template
   <typename Allocator,
    typename I, // I models InputIterator
    typename F> // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_constructible<I, F, F>::type
   uninitialized_move_alloc(Allocator &a, I f, I l, F r)
{
   F back = r;
   BOOST_TRY{
      while (f != l) {
         allocator_traits<Allocator>::construct(a, container_detail::iterator_to_raw_pointer(r), boost::move(*f));
         ++f; ++r;
      }
   }
   BOOST_CATCH(...){
      for (; back != r; ++back){
         allocator_traits<Allocator>::destroy(a, container_detail::iterator_to_raw_pointer(back));
      }
      BOOST_RETHROW;
   }
   BOOST_CATCH_END
   return r;
}

template
   <typename Allocator,
    typename I, // I models InputIterator
    typename F> // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_constructible<I, F, F>::type
   uninitialized_move_alloc(Allocator &, I f, I l, F r) BOOST_NOEXCEPT_OR_NOTHROW
{  return container_detail::memmove(f, l, r); }

//////////////////////////////////////////////////////////////////////////////
//
//                               uninitialized_move_alloc_n
//
//////////////////////////////////////////////////////////////////////////////

//! <b>Effects</b>:
//!   \code
//!   for (; n--; ++r, ++f)
//!      allocator_traits::construct(a, &*r, boost::move(*f));
//!   \endcode
//!
//! <b>Returns</b>: r
template
   <typename Allocator,
    typename I, // I models InputIterator
    typename F> // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_constructible<I, F, F>::type
   uninitialized_move_alloc_n(Allocator &a, I f, typename boost::container::iterator_traits<I>::difference_type n, F r)
{
   F back = r;
   BOOST_TRY{
      while (n--) {
         allocator_traits<Allocator>::construct(a, container_detail::iterator_to_raw_pointer(r), boost::move(*f));
         ++f; ++r;
      }
   }
   BOOST_CATCH(...){
      for (; back != r; ++back){
         allocator_traits<Allocator>::destroy(a, container_detail::iterator_to_raw_pointer(back));
      }
      BOOST_RETHROW;
   }
   BOOST_CATCH_END
   return r;
}

template
   <typename Allocator,
    typename I, // I models InputIterator
    typename F> // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_constructible<I, F, F>::type
   uninitialized_move_alloc_n(Allocator &, I f, typename boost::container::iterator_traits<I>::difference_type n, F r) BOOST_NOEXCEPT_OR_NOTHROW
{  return container_detail::memmove_n(f, n, r); }

//////////////////////////////////////////////////////////////////////////////
//
//                               uninitialized_move_alloc_n_source
//
//////////////////////////////////////////////////////////////////////////////

//! <b>Effects</b>:
//!   \code
//!   for (; n--; ++r, ++f)
//!      allocator_traits::construct(a, &*r, boost::move(*f));
//!   \endcode
//!
//! <b>Returns</b>: f (after incremented)
template
   <typename Allocator,
    typename I, // I models InputIterator
    typename F> // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_constructible<I, F, I>::type
   uninitialized_move_alloc_n_source(Allocator &a, I f, typename boost::container::iterator_traits<I>::difference_type n, F r)
{
   F back = r;
   BOOST_TRY{
      while (n--) {
         allocator_traits<Allocator>::construct(a, container_detail::iterator_to_raw_pointer(r), boost::move(*f));
         ++f; ++r;
      }
   }
   BOOST_CATCH(...){
      for (; back != r; ++back){
         allocator_traits<Allocator>::destroy(a, container_detail::iterator_to_raw_pointer(back));
      }
      BOOST_RETHROW;
   }
   BOOST_CATCH_END
   return f;
}

template
   <typename Allocator,
    typename I, // I models InputIterator
    typename F> // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_constructible<I, F, I>::type
   uninitialized_move_alloc_n_source(Allocator &, I f, typename boost::container::iterator_traits<I>::difference_type n, F r) BOOST_NOEXCEPT_OR_NOTHROW
{  return container_detail::memmove_n_source(f, n, r); }

//////////////////////////////////////////////////////////////////////////////
//
//                               uninitialized_copy_alloc
//
//////////////////////////////////////////////////////////////////////////////

//! <b>Effects</b>:
//!   \code
//!   for (; f != l; ++r, ++f)
//!      allocator_traits::construct(a, &*r, *f);
//!   \endcode
//!
//! <b>Returns</b>: r
template
   <typename Allocator,
    typename I, // I models InputIterator
    typename F> // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_constructible<I, F, F>::type
   uninitialized_copy_alloc(Allocator &a, I f, I l, F r)
{
   F back = r;
   BOOST_TRY{
      while (f != l) {
         allocator_traits<Allocator>::construct(a, container_detail::iterator_to_raw_pointer(r), *f);
         ++f; ++r;
      }
   }
   BOOST_CATCH(...){
      for (; back != r; ++back){
         allocator_traits<Allocator>::destroy(a, container_detail::iterator_to_raw_pointer(back));
      }
      BOOST_RETHROW;
   }
   BOOST_CATCH_END
   return r;
}

template
   <typename Allocator,
    typename I, // I models InputIterator
    typename F> // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_constructible<I, F, F>::type
   uninitialized_copy_alloc(Allocator &, I f, I l, F r) BOOST_NOEXCEPT_OR_NOTHROW
{  return container_detail::memmove(f, l, r); }

//////////////////////////////////////////////////////////////////////////////
//
//                               uninitialized_copy_alloc_n
//
//////////////////////////////////////////////////////////////////////////////

//! <b>Effects</b>:
//!   \code
//!   for (; n--; ++r, ++f)
//!      allocator_traits::construct(a, &*r, *f);
//!   \endcode
//!
//! <b>Returns</b>: r
template
   <typename Allocator,
    typename I, // I models InputIterator
    typename F> // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_constructible<I, F, F>::type
   uninitialized_copy_alloc_n(Allocator &a, I f, typename boost::container::iterator_traits<I>::difference_type n, F r)
{
   F back = r;
   BOOST_TRY{
      while (n--) {
         allocator_traits<Allocator>::construct(a, container_detail::iterator_to_raw_pointer(r), *f);
         ++f; ++r;
      }
   }
   BOOST_CATCH(...){
      for (; back != r; ++back){
         allocator_traits<Allocator>::destroy(a, container_detail::iterator_to_raw_pointer(back));
      }
      BOOST_RETHROW;
   }
   BOOST_CATCH_END
   return r;
}

template
   <typename Allocator,
    typename I, // I models InputIterator
    typename F> // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_constructible<I, F, F>::type
   uninitialized_copy_alloc_n(Allocator &, I f, typename boost::container::iterator_traits<I>::difference_type n, F r) BOOST_NOEXCEPT_OR_NOTHROW
{  return container_detail::memmove_n(f, n, r); }

//////////////////////////////////////////////////////////////////////////////
//
//                               uninitialized_copy_alloc_n_source
//
//////////////////////////////////////////////////////////////////////////////

//! <b>Effects</b>:
//!   \code
//!   for (; n--; ++r, ++f)
//!      allocator_traits::construct(a, &*r, *f);
//!   \endcode
//!
//! <b>Returns</b>: f (after incremented)
template
   <typename Allocator,
    typename I, // I models InputIterator
    typename F> // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_constructible<I, F, I>::type
   uninitialized_copy_alloc_n_source(Allocator &a, I f, typename boost::container::iterator_traits<I>::difference_type n, F r)
{
   F back = r;
   BOOST_TRY{
      while (n--) {
         allocator_traits<Allocator>::construct(a, container_detail::iterator_to_raw_pointer(r), *f);
         ++f; ++r;
      }
   }
   BOOST_CATCH(...){
      for (; back != r; ++back){
         allocator_traits<Allocator>::destroy(a, container_detail::iterator_to_raw_pointer(back));
      }
      BOOST_RETHROW;
   }
   BOOST_CATCH_END
   return f;
}

template
   <typename Allocator,
    typename I, // I models InputIterator
    typename F> // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_constructible<I, F, I>::type
   uninitialized_copy_alloc_n_source(Allocator &, I f, typename boost::container::iterator_traits<I>::difference_type n, F r) BOOST_NOEXCEPT_OR_NOTHROW
{  return container_detail::memmove_n_source(f, n, r); }

//////////////////////////////////////////////////////////////////////////////
//
//                               uninitialized_value_init_alloc_n
//
//////////////////////////////////////////////////////////////////////////////

//! <b>Effects</b>:
//!   \code
//!   for (; n--; ++r, ++f)
//!      allocator_traits::construct(a, &*r);
//!   \endcode
//!
//! <b>Returns</b>: r
template
   <typename Allocator,
    typename F> // F models ForwardIterator
inline typename container_detail::disable_if_memzero_initializable<F, F>::type
   uninitialized_value_init_alloc_n(Allocator &a, typename allocator_traits<Allocator>::difference_type n, F r)
{
   F back = r;
   BOOST_TRY{
      while (n--) {
         allocator_traits<Allocator>::construct(a, container_detail::iterator_to_raw_pointer(r));
         ++r;
      }
   }
   BOOST_CATCH(...){
      for (; back != r; ++back){
         allocator_traits<Allocator>::destroy(a, container_detail::iterator_to_raw_pointer(back));
      }
      BOOST_RETHROW;
   }
   BOOST_CATCH_END
   return r;
}

template
   <typename Allocator,
    typename F> // F models ForwardIterator
inline typename container_detail::enable_if_memzero_initializable<F, F>::type
   uninitialized_value_init_alloc_n(Allocator &, typename allocator_traits<Allocator>::difference_type n, F r)
{
   typedef typename boost::container::iterator_traits<F>::value_type value_type;
   std::memset((void*)container_detail::iterator_to_raw_pointer(r), 0, sizeof(value_type)*n);
   boost::container::iterator_advance(r, n);
   return r;
}

//////////////////////////////////////////////////////////////////////////////
//
//                               uninitialized_default_init_alloc_n
//
//////////////////////////////////////////////////////////////////////////////

//! <b>Effects</b>:
//!   \code
//!   for (; n--; ++r, ++f)
//!      allocator_traits::construct(a, &*r);
//!   \endcode
//!
//! <b>Returns</b>: r
template
   <typename Allocator,
    typename F> // F models ForwardIterator
inline F uninitialized_default_init_alloc_n(Allocator &a, typename allocator_traits<Allocator>::difference_type n, F r)
{
   F back = r;
   BOOST_TRY{
      while (n--) {
         allocator_traits<Allocator>::construct(a, container_detail::iterator_to_raw_pointer(r), default_init);
         ++r;
      }
   }
   BOOST_CATCH(...){
      for (; back != r; ++back){
         allocator_traits<Allocator>::destroy(a, container_detail::iterator_to_raw_pointer(back));
      }
      BOOST_RETHROW;
   }
   BOOST_CATCH_END
   return r;
}

//////////////////////////////////////////////////////////////////////////////
//
//                               uninitialized_fill_alloc
//
//////////////////////////////////////////////////////////////////////////////

//! <b>Effects</b>:
//!   \code
//!   for (; f != l; ++r, ++f)
//!      allocator_traits::construct(a, &*r, *f);
//!   \endcode
//!
//! <b>Returns</b>: r
template
   <typename Allocator,
    typename F, // F models ForwardIterator
    typename T>
inline void uninitialized_fill_alloc(Allocator &a, F f, F l, const T &t)
{
   F back = f;
   BOOST_TRY{
      while (f != l) {
         allocator_traits<Allocator>::construct(a, container_detail::iterator_to_raw_pointer(f), t);
         ++f;
      }
   }
   BOOST_CATCH(...){
      for (; back != l; ++back){
         allocator_traits<Allocator>::destroy(a, container_detail::iterator_to_raw_pointer(back));
      }
      BOOST_RETHROW;
   }
   BOOST_CATCH_END
}


//////////////////////////////////////////////////////////////////////////////
//
//                               uninitialized_fill_alloc_n
//
//////////////////////////////////////////////////////////////////////////////

//! <b>Effects</b>:
//!   \code
//!   for (; n--; ++r, ++f)
//!      allocator_traits::construct(a, &*r, v);
//!   \endcode
//!
//! <b>Returns</b>: r
template
   <typename Allocator,
    typename T,
    typename F> // F models ForwardIterator
inline F uninitialized_fill_alloc_n(Allocator &a, const T &v, typename allocator_traits<Allocator>::difference_type n, F r)
{
   F back = r;
   BOOST_TRY{
      while (n--) {
         allocator_traits<Allocator>::construct(a, container_detail::iterator_to_raw_pointer(r), v);
         ++r;
      }
   }
   BOOST_CATCH(...){
      for (; back != r; ++back){
         allocator_traits<Allocator>::destroy(a, container_detail::iterator_to_raw_pointer(back));
      }
      BOOST_RETHROW;
   }
   BOOST_CATCH_END
   return r;
}

//////////////////////////////////////////////////////////////////////////////
//
//                               copy
//
//////////////////////////////////////////////////////////////////////////////

template
<typename I,   // I models InputIterator
typename F>    // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_assignable<I, F, F>::type
   copy(I f, I l, F r)
{
   while (f != l) {
      *r = *f;
      ++f; ++r;
   }
   return r;
}

template
<typename I,   // I models InputIterator
typename F>    // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_assignable<I, F, F>::type
   copy(I f, I l, F r) BOOST_NOEXCEPT_OR_NOTHROW
{  return container_detail::memmove(f, l, r); }

//////////////////////////////////////////////////////////////////////////////
//
//                               copy_n
//
//////////////////////////////////////////////////////////////////////////////

template
<typename I,   // I models InputIterator
typename F>   // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_assignable<I, F, F>::type
   copy_n(I f, typename boost::container::iterator_traits<I>::difference_type n, F r)
{
   while (n--) {
      *r = *f;
      ++f; ++r;
   }
   return r;
}

template
<typename I,   // I models InputIterator
typename F>   // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_assignable<I, F, F>::type
   copy_n(I f, typename boost::container::iterator_traits<I>::difference_type n, F r) BOOST_NOEXCEPT_OR_NOTHROW
{  return container_detail::memmove_n(f, n, r); }

//////////////////////////////////////////////////////////////////////////////
//
//                            copy_n_source
//
//////////////////////////////////////////////////////////////////////////////

template
<typename I,   // I models InputIterator
typename F>   // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_assignable<I, F, I>::type
   copy_n_source(I f, typename boost::container::iterator_traits<I>::difference_type n, F r)
{
   while (n--) {
      *r = *f;
      ++f; ++r;
   }
   return f;
}

template
<typename I,   // I models InputIterator
typename F>   // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_assignable<I, F, I>::type
   copy_n_source(I f, typename boost::container::iterator_traits<I>::difference_type n, F r) BOOST_NOEXCEPT_OR_NOTHROW
{  return container_detail::memmove_n_source(f, n, r); }

//////////////////////////////////////////////////////////////////////////////
//
//                            copy_n_source_dest
//
//////////////////////////////////////////////////////////////////////////////

template
<typename I,   // I models InputIterator
typename F>   // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_assignable<I, F, I>::type
   copy_n_source_dest(I f, typename boost::container::iterator_traits<I>::difference_type n, F &r)
{
   while (n--) {
      *r = *f;
      ++f; ++r;
   }
   return f;
}

template
<typename I,   // I models InputIterator
typename F>   // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_assignable<I, F, I>::type
   copy_n_source_dest(I f, typename boost::container::iterator_traits<I>::difference_type n, F &r) BOOST_NOEXCEPT_OR_NOTHROW
{  return container_detail::memmove_n_source_dest(f, n, r);  }

//////////////////////////////////////////////////////////////////////////////
//
//                         move
//
//////////////////////////////////////////////////////////////////////////////

template
<typename I,   // I models InputIterator
typename F>   // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_assignable<I, F, F>::type
   move(I f, I l, F r)
{
   while (f != l) {
      *r = ::boost::move(*f);
      ++f; ++r;
   }
   return r;
}

template
<typename I,   // I models InputIterator
typename F>   // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_assignable<I, F, F>::type
   move(I f, I l, F r) BOOST_NOEXCEPT_OR_NOTHROW
{  return container_detail::memmove(f, l, r); }

//////////////////////////////////////////////////////////////////////////////
//
//                         move_n
//
//////////////////////////////////////////////////////////////////////////////

template
<typename I,   // I models InputIterator
typename F>   // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_assignable<I, F, F>::type
   move_n(I f, typename boost::container::iterator_traits<I>::difference_type n, F r)
{
   while (n--) {
      *r = ::boost::move(*f);
      ++f; ++r;
   }
   return r;
}

template
<typename I,   // I models InputIterator
typename F>   // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_assignable<I, F, F>::type
   move_n(I f, typename boost::container::iterator_traits<I>::difference_type n, F r) BOOST_NOEXCEPT_OR_NOTHROW
{  return container_detail::memmove_n(f, n, r); }


//////////////////////////////////////////////////////////////////////////////
//
//                         move_backward
//
//////////////////////////////////////////////////////////////////////////////

template
<typename I,   // I models BidirectionalIterator
typename F>    // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_assignable<I, F, F>::type
   move_backward(I f, I l, F r)
{
   while (f != l) {
      --l; --r;
      *r = ::boost::move(*l);
   }
   return r;
}

template
<typename I,   // I models InputIterator
typename F>   // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_assignable<I, F, F>::type
   move_backward(I f, I l, F r) BOOST_NOEXCEPT_OR_NOTHROW
{
   typedef typename boost::container::iterator_traits<I>::value_type value_type;
   const typename boost::container::iterator_traits<I>::difference_type n = boost::container::iterator_distance(f, l);
   r -= n;
   std::memmove((container_detail::iterator_to_raw_pointer)(r), (container_detail::iterator_to_raw_pointer)(f), sizeof(value_type)*n);
   return r;
}

//////////////////////////////////////////////////////////////////////////////
//
//                         move_n_source_dest
//
//////////////////////////////////////////////////////////////////////////////

template
<typename I    // I models InputIterator
,typename F>   // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_assignable<I, F, I>::type
   move_n_source_dest(I f, typename boost::container::iterator_traits<I>::difference_type n, F &r)
{
   while (n--) {
      *r = ::boost::move(*f);
      ++f; ++r;
   }
   return f;
}

template
<typename I    // I models InputIterator
,typename F>   // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_assignable<I, F, I>::type
   move_n_source_dest(I f, typename boost::container::iterator_traits<I>::difference_type n, F &r) BOOST_NOEXCEPT_OR_NOTHROW
{  return container_detail::memmove_n_source_dest(f, n, r); }

//////////////////////////////////////////////////////////////////////////////
//
//                         move_n_source
//
//////////////////////////////////////////////////////////////////////////////

template
<typename I    // I models InputIterator
,typename F>   // F models ForwardIterator
inline typename container_detail::disable_if_memtransfer_copy_assignable<I, F, I>::type
   move_n_source(I f, typename boost::container::iterator_traits<I>::difference_type n, F r)
{
   while (n--) {
      *r = ::boost::move(*f);
      ++f; ++r;
   }
   return f;
}

template
<typename I    // I models InputIterator
,typename F>   // F models ForwardIterator
inline typename container_detail::enable_if_memtransfer_copy_assignable<I, F, I>::type
   move_n_source(I f, typename boost::container::iterator_traits<I>::difference_type n, F r) BOOST_NOEXCEPT_OR_NOTHROW
{  return container_detail::memmove_n_source(f, n, r); }

//////////////////////////////////////////////////////////////////////////////
//
//                               destroy_alloc_n
//
//////////////////////////////////////////////////////////////////////////////

template
   <typename Allocator
   ,typename I   // I models InputIterator
   ,typename U>  // U models unsigned integral constant
inline typename container_detail::disable_if_trivially_destructible<I, void>::type
   destroy_alloc_n(Allocator &a, I f, U n)
{
   while(n--){
      allocator_traits<Allocator>::destroy(a, container_detail::iterator_to_raw_pointer(f));
      ++f;
   }
}

template
   <typename Allocator
   ,typename I   // I models InputIterator
   ,typename U>  // U models unsigned integral constant
inline typename container_detail::enable_if_trivially_destructible<I, void>::type
   destroy_alloc_n(Allocator &, I, U)
{}

//////////////////////////////////////////////////////////////////////////////
//
//                         deep_swap_alloc_n
//
//////////////////////////////////////////////////////////////////////////////

template
   <std::size_t MaxTmpBytes
   ,typename Allocator
   ,typename F // F models ForwardIterator
   ,typename G // G models ForwardIterator
   >
inline typename container_detail::disable_if_memtransfer_copy_assignable<F, G, void>::type
   deep_swap_alloc_n( Allocator &a, F short_range_f, typename allocator_traits<Allocator>::size_type n_i
                    , G large_range_f, typename allocator_traits<Allocator>::size_type n_j)
{
   typename allocator_traits<Allocator>::size_type n = 0;
   for (; n != n_i ; ++short_range_f, ++large_range_f, ++n){
      boost::adl_move_swap(*short_range_f, *large_range_f);
   }
   boost::container::uninitialized_move_alloc_n(a, large_range_f, n_j - n_i, short_range_f);  // may throw
   boost::container::destroy_alloc_n(a, large_range_f, n_j - n_i);
}

static const std::size_t DeepSwapAllocNMaxStorage = std::size_t(1) << std::size_t(11); //2K bytes

template
   <std::size_t MaxTmpBytes
   ,typename Allocator
   ,typename F // F models ForwardIterator
   ,typename G // G models ForwardIterator
   >
inline typename container_detail::enable_if_c
   < container_detail::is_memtransfer_copy_assignable<F, G>::value && (MaxTmpBytes <= DeepSwapAllocNMaxStorage) && false
   , void>::type
   deep_swap_alloc_n( Allocator &a, F short_range_f, typename allocator_traits<Allocator>::size_type n_i
                    , G large_range_f, typename allocator_traits<Allocator>::size_type n_j)
{
   typedef typename allocator_traits<Allocator>::value_type value_type;
   typedef typename container_detail::aligned_storage
      <MaxTmpBytes, container_detail::alignment_of<value_type>::value>::type storage_type;
   storage_type storage;

   const std::size_t n_i_bytes = sizeof(value_type)*n_i;
   void *const large_ptr = static_cast<void*>(container_detail::iterator_to_raw_pointer(large_range_f));
   void *const short_ptr = static_cast<void*>(container_detail::iterator_to_raw_pointer(short_range_f));
   void *const stora_ptr = static_cast<void*>(container_detail::iterator_to_raw_pointer(storage));
   std::memcpy(stora_ptr, large_ptr, n_i_bytes);
   std::memcpy(large_ptr, short_ptr, n_i_bytes);
   std::memcpy(short_ptr, stora_ptr, n_i_bytes);
   boost::container::iterator_advance(large_range_f, n_i);
   boost::container::iterator_advance(short_range_f, n_i);
   boost::container::uninitialized_move_alloc_n(a, large_range_f, n_j - n_i, short_range_f);  // may throw
   boost::container::destroy_alloc_n(a, large_range_f, n_j - n_i);
}

template
   <std::size_t MaxTmpBytes
   ,typename Allocator
   ,typename F // F models ForwardIterator
   ,typename G // G models ForwardIterator
   >
inline typename container_detail::enable_if_c
   < container_detail::is_memtransfer_copy_assignable<F, G>::value && true//(MaxTmpBytes > DeepSwapAllocNMaxStorage)
   , void>::type
   deep_swap_alloc_n( Allocator &a, F short_range_f, typename allocator_traits<Allocator>::size_type n_i
                    , G large_range_f, typename allocator_traits<Allocator>::size_type n_j)
{
   typedef typename allocator_traits<Allocator>::value_type value_type;
   typedef typename container_detail::aligned_storage
      <DeepSwapAllocNMaxStorage, container_detail::alignment_of<value_type>::value>::type storage_type;
   storage_type storage;
   const std::size_t sizeof_storage = sizeof(storage);

   std::size_t n_i_bytes = sizeof(value_type)*n_i;
   char *large_ptr = static_cast<char*>(static_cast<void*>(container_detail::iterator_to_raw_pointer(large_range_f)));
   char *short_ptr = static_cast<char*>(static_cast<void*>(container_detail::iterator_to_raw_pointer(short_range_f)));
   char *stora_ptr = static_cast<char*>(static_cast<void*>(&storage));

   std::size_t szt_times = n_i_bytes/sizeof_storage;
   const std::size_t szt_rem = n_i_bytes%sizeof_storage;

   //Loop unrolling using Duff's device, as it seems it helps on some architectures
   const std::size_t Unroll = 4;
   std::size_t n = (szt_times + (Unroll-1))/Unroll;
   const std::size_t branch_number = (!szt_times)*Unroll + (szt_times % Unroll);
   switch(branch_number){
      case 4:
         break;
      case 0: do{
         std::memcpy(stora_ptr, large_ptr, sizeof_storage);
         std::memcpy(large_ptr, short_ptr, sizeof_storage);
         std::memcpy(short_ptr, stora_ptr, sizeof_storage);
         large_ptr += sizeof_storage;
         short_ptr += sizeof_storage;
         BOOST_CONTAINER_FALLTHOUGH
      case 3:
         std::memcpy(stora_ptr, large_ptr, sizeof_storage);
         std::memcpy(large_ptr, short_ptr, sizeof_storage);
         std::memcpy(short_ptr, stora_ptr, sizeof_storage);
         large_ptr += sizeof_storage;
         short_ptr += sizeof_storage;
         BOOST_CONTAINER_FALLTHOUGH
      case 2:
         std::memcpy(stora_ptr, large_ptr, sizeof_storage);
         std::memcpy(large_ptr, short_ptr, sizeof_storage);
         std::memcpy(short_ptr, stora_ptr, sizeof_storage);
         large_ptr += sizeof_storage;
         short_ptr += sizeof_storage;
         BOOST_CONTAINER_FALLTHOUGH
      case 1:
         std::memcpy(stora_ptr, large_ptr, sizeof_storage);
         std::memcpy(large_ptr, short_ptr, sizeof_storage);
         std::memcpy(short_ptr, stora_ptr, sizeof_storage);
         large_ptr += sizeof_storage;
         short_ptr += sizeof_storage;
         } while(--n);
   }
   std::memcpy(stora_ptr, large_ptr, szt_rem);
   std::memcpy(large_ptr, short_ptr, szt_rem);
   std::memcpy(short_ptr, stora_ptr, szt_rem);
   boost::container::iterator_advance(large_range_f, n_i);
   boost::container::iterator_advance(short_range_f, n_i);
   boost::container::uninitialized_move_alloc_n(a, large_range_f, n_j - n_i, short_range_f);  // may throw
   boost::container::destroy_alloc_n(a, large_range_f, n_j - n_i);
}


//////////////////////////////////////////////////////////////////////////////
//
//                         copy_assign_range_alloc_n
//
//////////////////////////////////////////////////////////////////////////////

template
   <typename Allocator
   ,typename I // F models InputIterator
   ,typename O // G models OutputIterator
   >
void copy_assign_range_alloc_n( Allocator &a, I inp_start, typename allocator_traits<Allocator>::size_type n_i
                              , O out_start, typename allocator_traits<Allocator>::size_type n_o )
{
   if (n_o < n_i){
      inp_start = boost::container::copy_n_source_dest(inp_start, n_o, out_start);     // may throw
      boost::container::uninitialized_copy_alloc_n(a, inp_start, n_i - n_o, out_start);// may throw
   }
   else{
      out_start = boost::container::copy_n(inp_start, n_i, out_start);  // may throw
      boost::container::destroy_alloc_n(a, out_start, n_o - n_i);
   }
}

//////////////////////////////////////////////////////////////////////////////
//
//                         move_assign_range_alloc_n
//
//////////////////////////////////////////////////////////////////////////////

template
   <typename Allocator
   ,typename I // F models InputIterator
   ,typename O // G models OutputIterator
   >
void move_assign_range_alloc_n( Allocator &a, I inp_start, typename allocator_traits<Allocator>::size_type n_i
                              , O out_start, typename allocator_traits<Allocator>::size_type n_o )
{
   if (n_o < n_i){
      inp_start = boost::container::move_n_source_dest(inp_start, n_o, out_start);  // may throw
      boost::container::uninitialized_move_alloc_n(a, inp_start, n_i - n_o, out_start);  // may throw
   }
   else{
      out_start = boost::container::move_n(inp_start, n_i, out_start);  // may throw
      boost::container::destroy_alloc_n(a, out_start, n_o - n_i);
   }
}

}  //namespace container {
}  //namespace boost {

#endif   //#ifndef BOOST_CONTAINER_DETAIL_UTILITIES_HPP