3rdparty/boost/boost/type_traits/add_reference.hpp

   1
   2 //  (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
   3 //  Use, modification and distribution are subject to the Boost Software License,
   4 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 //  http://www.boost.org/LICENSE_1_0.txt).
   6 //
   7 //  See http://www.boost.org/libs/type_traits for most recent version including documentation.
   8
   9 #ifndef BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
  10 #define BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
  11
  12 #include <boost/type_traits/is_reference.hpp>
  13 #include <boost/detail/workaround.hpp>
  14 #include <boost/config.hpp>
  15
  16 // should be the last #include
  17 #include <boost/type_traits/detail/type_trait_def.hpp>
  18
  19 namespace boost {
  20
  21 namespace detail {
  22
  23 //
  24 // We can't filter out rvalue_references at the same level as
  25 // references or we get ambiguities from msvc:
  26 //
  27
  28 template <typename T>
  29 struct add_reference_rvalue_layer
  30 {
  31     typedef T& type;
  32 };
  33
  34 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  35 template <typename T>
  36 struct add_reference_rvalue_layer<T&&>
  37 {
  38     typedef T&& type;
  39 };
  40 #endif
  41
  42 template <typename T>
  43 struct add_reference_impl
  44 {
  45     typedef typename add_reference_rvalue_layer<T>::type type;
  46 };
  47
  48 BOOST_TT_AUX_TYPE_TRAIT_IMPL_PARTIAL_SPEC1_1(typename T,add_reference,T&,T&)
  49
  50 // these full specialisations are always required:
  51 BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void,void)
  52 #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
  53 BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void const,void const)
  54 BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void volatile,void volatile)
  55 BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void const volatile,void const volatile)
  56 #endif
  57
  58 } // namespace detail
  59
  60 BOOST_TT_AUX_TYPE_TRAIT_DEF1(add_reference,T,typename boost::detail::add_reference_impl<T>::type)
  61
  62 // agurt, 07/mar/03: workaround Borland's ill-formed sensitivity to an additional
  63 // level of indirection, here
  64 #if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
  65 BOOST_TT_AUX_TYPE_TRAIT_PARTIAL_SPEC1_1(typename T,add_reference,T&,T&)
  66 #endif
  67
  68 } // namespace boost
  69
  70 #include <boost/type_traits/detail/type_trait_undef.hpp>
  71
  72 #endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED