/* Copyright 2003-2008 Joaquin M Lopez Munoz. | |
* 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) | |
* | |
* See http://www.boost.org/libs/multi_index for library home page. | |
*/ | |
#ifndef BOOST_MULTI_INDEX_DETAIL_UINTPTR_TYPE_HPP | |
#define BOOST_MULTI_INDEX_DETAIL_UINTPTR_TYPE_HPP | |
#if defined(_MSC_VER)&&(_MSC_VER>=1200) | |
#pragma once | |
#endif | |
#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ | |
#include <boost/mpl/bool.hpp> | |
namespace boost{ | |
namespace multi_index{ | |
namespace detail{ | |
/* has_uintptr_type is an MPL integral constant determining whether | |
* there exists an unsigned integral type with the same size as | |
* void *. | |
* uintptr_type is such a type if has_uintptr is true, or unsigned int | |
* otherwise. | |
* Note that uintptr_type is more restrictive than C99 uintptr_t, | |
* where an integral type with size greater than that of void * | |
* would be conformant. | |
*/ | |
template<int N>struct uintptr_candidates; | |
template<>struct uintptr_candidates<-1>{typedef unsigned int type;}; | |
template<>struct uintptr_candidates<0> {typedef unsigned int type;}; | |
template<>struct uintptr_candidates<1> {typedef unsigned short type;}; | |
template<>struct uintptr_candidates<2> {typedef unsigned long type;}; | |
#if defined(BOOST_HAS_LONG_LONG) | |
template<>struct uintptr_candidates<3> {typedef boost::ulong_long_type type;}; | |
#else | |
template<>struct uintptr_candidates<3> {typedef unsigned int type;}; | |
#endif | |
#if defined(BOOST_HAS_MS_INT64) | |
template<>struct uintptr_candidates<4> {typedef unsigned __int64 type;}; | |
#else | |
template<>struct uintptr_candidates<4> {typedef unsigned int type;}; | |
#endif | |
struct uintptr_aux | |
{ | |
BOOST_STATIC_CONSTANT(int,index= | |
sizeof(void*)==sizeof(uintptr_candidates<0>::type)?0: | |
sizeof(void*)==sizeof(uintptr_candidates<1>::type)?1: | |
sizeof(void*)==sizeof(uintptr_candidates<2>::type)?2: | |
sizeof(void*)==sizeof(uintptr_candidates<3>::type)?3: | |
sizeof(void*)==sizeof(uintptr_candidates<4>::type)?4:-1); | |
BOOST_STATIC_CONSTANT(bool,has_uintptr_type=(index>=0)); | |
typedef uintptr_candidates<index>::type type; | |
}; | |
typedef mpl::bool_<uintptr_aux::has_uintptr_type> has_uintptr_type; | |
typedef uintptr_aux::type uintptr_type; | |
} /* namespace multi_index::detail */ | |
} /* namespace multi_index */ | |
} /* namespace boost */ | |
#endif |