ceph/src/boost/libs/type_traits/include/boost/type_traits/add_const.hpp

   1
   2 //  (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard
   3 //  Hinnant & John Maddock 2000.
   4 //  Use, modification and distribution are subject to the Boost Software License,
   5 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6 //  http://www.boost.org/LICENSE_1_0.txt).
   7 //
   8 //  See http://www.boost.org/libs/type_traits for most recent version including documentation.
   9
  10 #ifndef BOOST_TT_ADD_CONST_HPP_INCLUDED
  11 #define BOOST_TT_ADD_CONST_HPP_INCLUDED
  12
  13 #include <boost/type_traits/detail/config.hpp>
  14
  15 namespace boost {
  16
  17 // * convert a type T to const type - add_const<T>
  18 // this is not required since the result is always
  19 // the same as "T const", but it does suppress warnings
  20 // from some compilers:
  21
  22 #if defined(BOOST_MSVC)
  23 // This bogus warning will appear when add_const is applied to a
  24 // const volatile reference because we can't detect const volatile
  25 // references with MSVC6.
  26 #   pragma warning(push)
  27 #   pragma warning(disable:4181) // warning C4181: qualifier applied to reference type ignored
  28 #endif
  29
  30    template <class T> struct add_const
  31    {
  32       typedef T const type;
  33    };
  34
  35 #if defined(BOOST_MSVC)
  36 #   pragma warning(pop)
  37 #endif
  38
  39    template <class T> struct add_const<T&>
  40    {
  41       typedef T& type;
  42    };
  43
  44 } // namespace boost
  45
  46 #endif // BOOST_TT_ADD_CONST_HPP_INCLUDED