// (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

