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1 | /* Copyright 2003-2013 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_UINTPTR_TYPE_HPP | |
10 | #define BOOST_MULTI_INDEX_DETAIL_UINTPTR_TYPE_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 | ||
19 | namespace boost{ | |
20 | ||
21 | namespace multi_index{ | |
22 | ||
23 | namespace detail{ | |
24 | ||
25 | /* has_uintptr_type is an MPL integral constant determining whether | |
26 | * there exists an unsigned integral type with the same size as | |
27 | * void *. | |
28 | * uintptr_type is such a type if has_uintptr is true, or unsigned int | |
29 | * otherwise. | |
30 | * Note that uintptr_type is more restrictive than C99 uintptr_t, | |
31 | * where an integral type with size greater than that of void * | |
32 | * would be conformant. | |
33 | */ | |
34 | ||
35 | template<int N>struct uintptr_candidates; | |
36 | template<>struct uintptr_candidates<-1>{typedef unsigned int type;}; | |
37 | template<>struct uintptr_candidates<0> {typedef unsigned int type;}; | |
38 | template<>struct uintptr_candidates<1> {typedef unsigned short type;}; | |
39 | template<>struct uintptr_candidates<2> {typedef unsigned long type;}; | |
40 | ||
41 | #if defined(BOOST_HAS_LONG_LONG) | |
42 | template<>struct uintptr_candidates<3> {typedef boost::ulong_long_type type;}; | |
43 | #else | |
44 | template<>struct uintptr_candidates<3> {typedef unsigned int type;}; | |
45 | #endif | |
46 | ||
47 | #if defined(BOOST_HAS_MS_INT64) | |
48 | template<>struct uintptr_candidates<4> {typedef unsigned __int64 type;}; | |
49 | #else | |
50 | template<>struct uintptr_candidates<4> {typedef unsigned int type;}; | |
51 | #endif | |
52 | ||
53 | struct uintptr_aux | |
54 | { | |
55 | BOOST_STATIC_CONSTANT(int,index= | |
56 | sizeof(void*)==sizeof(uintptr_candidates<0>::type)?0: | |
57 | sizeof(void*)==sizeof(uintptr_candidates<1>::type)?1: | |
58 | sizeof(void*)==sizeof(uintptr_candidates<2>::type)?2: | |
59 | sizeof(void*)==sizeof(uintptr_candidates<3>::type)?3: | |
60 | sizeof(void*)==sizeof(uintptr_candidates<4>::type)?4:-1); | |
61 | ||
62 | BOOST_STATIC_CONSTANT(bool,has_uintptr_type=(index>=0)); | |
63 | ||
64 | typedef uintptr_candidates<index>::type type; | |
65 | }; | |
66 | ||
67 | typedef mpl::bool_<uintptr_aux::has_uintptr_type> has_uintptr_type; | |
68 | typedef uintptr_aux::type uintptr_type; | |
69 | ||
70 | } /* namespace multi_index::detail */ | |
71 | ||
72 | } /* namespace multi_index */ | |
73 | ||
74 | } /* namespace boost */ | |
75 | ||
76 | #endif |