77 lines
2.5 KiB
Plaintext
77 lines
2.5 KiB
Plaintext
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/* Copyright 2003-2013 Joaquin M Lopez Munoz.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* See http://www.boost.org/libs/multi_index for library home page.
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*/
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#ifndef BOOST_MULTI_INDEX_DETAIL_UINTPTR_TYPE_HPP
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#define BOOST_MULTI_INDEX_DETAIL_UINTPTR_TYPE_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
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#include <boost/mpl/bool.hpp>
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namespace boost{
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namespace multi_index{
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namespace detail{
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/* has_uintptr_type is an MPL integral constant determining whether
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* there exists an unsigned integral type with the same size as
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* void *.
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* uintptr_type is such a type if has_uintptr is true, or unsigned int
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* otherwise.
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* Note that uintptr_type is more restrictive than C99 uintptr_t,
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* where an integral type with size greater than that of void *
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* would be conformant.
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*/
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template<int N>struct uintptr_candidates;
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template<>struct uintptr_candidates<-1>{typedef unsigned int type;};
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template<>struct uintptr_candidates<0> {typedef unsigned int type;};
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template<>struct uintptr_candidates<1> {typedef unsigned short type;};
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template<>struct uintptr_candidates<2> {typedef unsigned long type;};
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#if defined(BOOST_HAS_LONG_LONG)
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template<>struct uintptr_candidates<3> {typedef boost::ulong_long_type type;};
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#else
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template<>struct uintptr_candidates<3> {typedef unsigned int type;};
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#endif
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#if defined(BOOST_HAS_MS_INT64)
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template<>struct uintptr_candidates<4> {typedef unsigned __int64 type;};
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#else
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template<>struct uintptr_candidates<4> {typedef unsigned int type;};
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#endif
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struct uintptr_aux
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{
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BOOST_STATIC_CONSTANT(int,index=
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sizeof(void*)==sizeof(uintptr_candidates<0>::type)?0:
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sizeof(void*)==sizeof(uintptr_candidates<1>::type)?1:
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sizeof(void*)==sizeof(uintptr_candidates<2>::type)?2:
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sizeof(void*)==sizeof(uintptr_candidates<3>::type)?3:
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sizeof(void*)==sizeof(uintptr_candidates<4>::type)?4:-1);
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BOOST_STATIC_CONSTANT(bool,has_uintptr_type=(index>=0));
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typedef uintptr_candidates<index>::type type;
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};
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typedef mpl::bool_<uintptr_aux::has_uintptr_type> has_uintptr_type;
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typedef uintptr_aux::type uintptr_type;
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} /* namespace multi_index::detail */
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} /* namespace multi_index */
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} /* namespace boost */
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#endif
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