ceph/src/boost/libs/multi_index/include/boost/multi_index/detail/raw_ptr.hpp

   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>
  29 inline RawPointer raw_ptr(RawPointer const& p,mpl::true_)
  30 {
  31   return p;
  32 }
  33
  34 template<typename RawPointer,typename Pointer>
  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>
  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