// (C) Copyright Jonathan Turkanis 2004-2005.

 // 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.)

 // Contains the definition of move_ptrs::default_deleter, the default

 // Deleter template argument to move_ptr. Uses a technique of Daniel

 // Wallin to capture the type of a pointer at the time the deleter 

 // is constructed, so that move_ptrs can delete objects of incomplete 

 // type by default.

 #ifndef BOOST_MOVE_PTR_DEFAULT_DELETER_HPP_INCLUDED

 #define BOOST_MOVE_PTR_DEFAULT_DELETER_HPP_INCLUDED 

 #include <boost/checked_delete.hpp>

 #include <boost/mpl/if.hpp>

 #include <boost/type_traits/is_array.hpp>

 #include <boost/type_traits/remove_bounds.hpp>

 namespace boost { namespace ptr_container_detail { namespace move_ptrs {

 namespace ptr_container_detail {

 template<typename T>

 struct deleter_base {

     typedef void (*deleter)(T*);

     deleter_base(deleter d) { delete_ = d; }

     void operator() (T* t) const { delete_(t); }

     static deleter delete_;

 };

 template<class T>

 typename deleter_base<T>::deleter 

 deleter_base<T>::delete_;

 template<typename T>

 struct scalar_deleter : deleter_base<T> {

     typedef deleter_base<T> base;

     scalar_deleter() : base(do_delete) { }

     static void do_delete(T* t) { checked_delete(t); }

 };

 template<typename T>

 struct array_deleter 

     : deleter_base<typename remove_bounds<T>::type>

 {

     typedef typename remove_bounds<T>::type element_type;

     typedef deleter_base<element_type> base;

     array_deleter() : base(do_delete) { }

     static void do_delete(element_type* t) { checked_array_delete(t); }

 };

 } // End namespace ptr_container_detail.

 template<typename T>

 struct default_deleter

     : mpl::if_<

           is_array<T>,

           ptr_container_detail::array_deleter<T>,

           ptr_container_detail::scalar_deleter<T>

       >::type

 { 

     default_deleter() { }

     template<typename TT>

     default_deleter(default_deleter<TT> tt) { }

 };

 } } } // End namespaces ptr_container_detail, move_ptrs, boost.

 #endif // #ifndef BOOST_MOVE_PTR_DEFAULT_DELETER_HPP_INCLUDED