1#ifndef POINTEE_DWA200415_HPP
2# define POINTEE_DWA200415_HPP
3
4//
5// Copyright David Abrahams 2004. Use, modification and distribution is
6// subject to the Boost Software License, Version 1.0. (See accompanying
7// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
8//
9// typename pointee<P>::type provides the pointee type of P.
10//
11// For example, it is T for T* and X for shared_ptr<X>.
12//
13// http://www.boost.org/libs/iterator/doc/pointee.html
14//
15
16# include <boost/detail/is_incrementable.hpp>
17# include <boost/iterator/iterator_traits.hpp>
18# include <boost/type_traits/add_const.hpp>
19# include <boost/type_traits/remove_cv.hpp>
20# include <boost/mpl/if.hpp>
21# include <boost/mpl/eval_if.hpp>
22
23#include <iterator>
24
25namespace boost {
26
27namespace detail
28{
29 template <class P>
30 struct smart_ptr_pointee
31 {
32 typedef typename P::element_type type;
33 };
34
35 template <class Iterator>
36 struct iterator_pointee
37 {
38 typedef typename std::iterator_traits<Iterator>::value_type value_type;
39
40 struct impl
41 {
42 template <class T>
43 static char test(T const&);
44
45 static char (& test(value_type&) )[2];
46
47 static Iterator& x;
48 };
49
50 BOOST_STATIC_CONSTANT(bool, is_constant = sizeof(impl::test(*impl::x)) == 1);
51
52 typedef typename mpl::if_c<
53# if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
54 ::boost::detail::iterator_pointee<Iterator>::is_constant
55# else
56 is_constant
57# endif
58 , typename add_const<value_type>::type
59 , value_type
60 >::type type;
61 };
62}
63
64template <class P>
65struct pointee
66 : mpl::eval_if<
67 detail::is_incrementable<P>
68 , detail::iterator_pointee<P>
69 , detail::smart_ptr_pointee<P>
70 >
71{
72};
73
74} // namespace boost
75
76#endif // POINTEE_DWA200415_HPP
77