1// (C) Copyright Jonathan Turkanis 2004-2005.
2// Distributed under the Boost Software License, Version 1.0. (See accompanying
3// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
4
5// Contains the definition of move_ptrs::default_deleter, the default
6// Deleter template argument to move_ptr. Uses a technique of Daniel
7// Wallin to capture the type of a pointer at the time the deleter
8// is constructed, so that move_ptrs can delete objects of incomplete
9// type by default.
10
11#ifndef BOOST_MOVE_PTR_DEFAULT_DELETER_HPP_INCLUDED
12#define BOOST_MOVE_PTR_DEFAULT_DELETER_HPP_INCLUDED
13
14#include <boost/checked_delete.hpp>
15#include <boost/mpl/if.hpp>
16#include <boost/type_traits/is_array.hpp>
17#include <boost/type_traits/remove_bounds.hpp>
18
19namespace boost { namespace ptr_container_detail { namespace move_ptrs {
20
21namespace ptr_container_detail {
22
23template<typename T>
24struct deleter_base {
25 typedef void (*deleter)(T*);
26 deleter_base(deleter d) { delete_ = d; }
27 void operator() (T* t) const { delete_(t); }
28 static deleter delete_;
29};
30
31template<class T>
32typename deleter_base<T>::deleter
33deleter_base<T>::delete_;
34
35template<typename T>
36struct scalar_deleter : deleter_base<T> {
37 typedef deleter_base<T> base;
38 scalar_deleter() : base(do_delete) { }
39 static void do_delete(T* t) { checked_delete(t); }
40};
41
42template<typename T>
43struct array_deleter
44 : deleter_base<typename remove_bounds<T>::type>
45{
46 typedef typename remove_bounds<T>::type element_type;
47 typedef deleter_base<element_type> base;
48 array_deleter() : base(do_delete) { }
49 static void do_delete(element_type* t) { checked_array_delete(t); }
50};
51
52} // End namespace ptr_container_detail.
53
54template<typename T>
55struct default_deleter
56 : mpl::if_<
57 is_array<T>,
58 ptr_container_detail::array_deleter<T>,
59 ptr_container_detail::scalar_deleter<T>
60 >::type
61{
62 default_deleter() { }
63 template<typename TT>
64 default_deleter(default_deleter<TT>) { }
65};
66
67} } } // End namespaces ptr_container_detail, move_ptrs, boost.
68
69#endif // #ifndef BOOST_MOVE_PTR_DEFAULT_DELETER_HPP_INCLUDED
70

source code of boost/libs/ptr_container/include/boost/ptr_container/detail/default_deleter.hpp