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// (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
#if defined(__GNUC__)
#pragma GCC system_header
#endif
#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>) { }
};
} } } // End namespaces ptr_container_detail, move_ptrs, boost.
#endif // #ifndef BOOST_MOVE_PTR_DEFAULT_DELETER_HPP_INCLUDED
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