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- /* Copyright 2003-2013 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)
- #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
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