boost/type_traits/remove_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_REMOVE_REFERENCE_HPP_INCLUDED
  10 #define BOOST_TT_REMOVE_REFERENCE_HPP_INCLUDED
  11
  12 #include <boost/type_traits/broken_compiler_spec.hpp>
  13 #include <boost/config.hpp>
  14 #include <boost/detail/workaround.hpp>
  15
  16 #if BOOST_WORKAROUND(BOOST_MSVC,<=1300)
  17 #include <boost/type_traits/msvc/remove_reference.hpp>
  18 #endif
  19
  20 // should be the last #include
  21 #include <boost/type_traits/detail/type_trait_def.hpp>
  22
  23 namespace boost {
  24
  25 #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
  26
  27 namespace detail{
  28 //
  29 // We can't filter out rvalue_references at the same level as
  30 // references or we get ambiguities from msvc:
  31 //
  32 template <class T>
  33 struct remove_rvalue_ref
  34 {
  35         typedef T type;
  36 };
  37 #ifndef BOOST_NO_RVALUE_REFERENCES
  38 template <class T>
  39 struct remove_rvalue_ref<T&&>
  40 {
  41         typedef T type;
  42 };
  43 #endif
  44
  45 } // namespace detail
  46
  47 BOOST_TT_AUX_TYPE_TRAIT_DEF1(remove_reference,T,typename boost::detail::remove_rvalue_ref<T>::type)
  48 BOOST_TT_AUX_TYPE_TRAIT_PARTIAL_SPEC1_1(typename T,remove_reference,T&,T)
  49
  50 #if defined(BOOST_ILLEGAL_CV_REFERENCES)
  51 // these are illegal specialisations; cv-qualifies applied to
  52 // references have no effect according to [8.3.2p1],
  53 // C++ Builder requires them though as it treats cv-qualified
  54 // references as distinct types...
  55 BOOST_TT_AUX_TYPE_TRAIT_PARTIAL_SPEC1_1(typename T,remove_reference,T& const,T)
  56 BOOST_TT_AUX_TYPE_TRAIT_PARTIAL_SPEC1_1(typename T,remove_reference,T& volatile,T)
  57 BOOST_TT_AUX_TYPE_TRAIT_PARTIAL_SPEC1_1(typename T,remove_reference,T& const volatile,T)
  58 #endif
  59
  60 #elif !BOOST_WORKAROUND(BOOST_MSVC,<=1300)
  61
  62 BOOST_TT_AUX_TYPE_TRAIT_DEF1(remove_reference,T,typename boost::detail::remove_reference_impl<T>::type)
  63
  64 #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
  65
  66 } // namespace boost
  67
  68 #include <boost/type_traits/detail/type_trait_undef.hpp>
  69
  70 #endif // BOOST_TT_REMOVE_REFERENCE_HPP_INCLUDED