1 /* Copyright 2003-2015 Joaquin M Lopez Munoz.
2  * Distributed under the Boost Software License, Version 1.0.
3  * (See accompanying file LICENSE_1_0.txt or copy at
4  * http://www.boost.org/LICENSE_1_0.txt)
5  *
6  * See http://www.boost.org/libs/multi_index for library home page.
7  */
8 
9 #ifndef BOOST_MULTI_INDEX_DETAIL_RAW_PTR_HPP
10 #define BOOST_MULTI_INDEX_DETAIL_RAW_PTR_HPP
11 
12 #if defined(_MSC_VER)
13 #pragma once
14 #endif
15 
16 #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
17 #include <boost/mpl/bool.hpp>
18 #include <boost/type_traits/is_same.hpp>
19 
20 namespace boost{
21 
22 namespace multi_index{
23 
24 namespace detail{
25 
26 /* gets the underlying pointer of a pointer-like value */
27 
28 template<typename RawPointer>
raw_ptr(RawPointer const & p,mpl::true_)29 inline RawPointer raw_ptr(RawPointer const& p,mpl::true_)
30 {
31   return p;
32 }
33 
34 template<typename RawPointer,typename Pointer>
raw_ptr(Pointer const & p,mpl::false_)35 inline RawPointer raw_ptr(Pointer const& p,mpl::false_)
36 {
37   return p==Pointer(0)?0:&*p;
38 }
39 
40 template<typename RawPointer,typename Pointer>
raw_ptr(Pointer const & p)41 inline RawPointer raw_ptr(Pointer const& p)
42 {
43   return raw_ptr<RawPointer>(p,is_same<RawPointer,Pointer>());
44 }
45 
46 } /* namespace multi_index::detail */
47 
48 } /* namespace multi_index */
49 
50 } /* namespace boost */
51 
52 #endif
53