73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
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// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (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/type_traits for most recent version including documentation.
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#ifndef BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
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#define BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
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#include <boost/type_traits/is_reference.hpp>
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#include <boost/detail/workaround.hpp>
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#include <boost/config.hpp>
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// should be the last #include
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#include <boost/type_traits/detail/type_trait_def.hpp>
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namespace boost {
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namespace detail {
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//
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// We can't filter out rvalue_references at the same level as
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// references or we get ambiguities from msvc:
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//
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template <typename T>
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struct add_reference_rvalue_layer
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{
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typedef T& type;
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};
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template <typename T>
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struct add_reference_rvalue_layer<T&&>
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{
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typedef T&& type;
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};
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#endif
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template <typename T>
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struct add_reference_impl
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{
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typedef typename add_reference_rvalue_layer<T>::type type;
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};
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BOOST_TT_AUX_TYPE_TRAIT_IMPL_PARTIAL_SPEC1_1(typename T,add_reference,T&,T&)
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// these full specialisations are always required:
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BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void,void)
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#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
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BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void const,void const)
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BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void volatile,void volatile)
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BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void const volatile,void const volatile)
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#endif
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} // namespace detail
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BOOST_TT_AUX_TYPE_TRAIT_DEF1(add_reference,T,typename boost::detail::add_reference_impl<T>::type)
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// agurt, 07/mar/03: workaround Borland's ill-formed sensitivity to an additional
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// level of indirection, here
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#if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
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BOOST_TT_AUX_TYPE_TRAIT_PARTIAL_SPEC1_1(typename T,add_reference,T&,T&)
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#endif
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} // namespace boost
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#include <boost/type_traits/detail/type_trait_undef.hpp>
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#endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
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