boost/type_traits/type_identity.hpp

0001 #ifndef BOOST_TYPE_TRAITS_TYPE_IDENTITY_HPP_INCLUDED
0002 #define BOOST_TYPE_TRAITS_TYPE_IDENTITY_HPP_INCLUDED
0003
0004 //
0005 //  Copyright 2015 Peter Dimov
0006 //
0007 //  Distributed under the Boost Software License, Version 1.0.
0008 //  See accompanying file LICENSE_1_0.txt or copy at
0009 //  http://www.boost.org/LICENSE_1_0.txt
0010 //
0011
0012 #include <boost/config.hpp>
0013
0014 namespace boost
0015 {
0016
0017 template<class T> struct type_identity
0018 {
0019     typedef T type;
0020 };
0021
0022 #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
0023
0024 template <class T> using type_identity_t = typename type_identity<T>::type;
0025
0026 #endif
0027
0028
0029 } // namespace boost
0030
0031 #endif // #ifndef BOOST_TYPE_TRAITS_TYPE_IDENTITY_HPP_INCLUDED