boost/type_traits/is_noncopyable.hpp

0001 #ifndef BOOST_TYPE_TRAITS_IS_NONCOPYABLE_HPP_INCLUDED
0002 #define BOOST_TYPE_TRAITS_IS_NONCOPYABLE_HPP_INCLUDED
0003
0004 //
0005 //  Copyright 2018 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 //  is_noncopyable<T> returns whether T is derived from boost::noncopyable
0012 //
0013
0014 #include <boost/type_traits/is_base_and_derived.hpp>
0015
0016 namespace boost
0017 {
0018
0019 #ifndef BOOST_NONCOPYABLE_BASE_TOKEN_DEFINED
0020 #define BOOST_NONCOPYABLE_BASE_TOKEN_DEFINED
0021
0022 // boost::noncopyable derives from noncopyable_::base_token to enable us
0023 // to recognize it. The definition is macro-guarded so that we can replicate
0024 // it here without including boost/core/noncopyable.hpp, which is in Core.
0025
0026 namespace noncopyable_
0027 {
0028     struct base_token {};
0029 }
0030
0031 #endif // #ifndef BOOST_NONCOPYABLE_BASE_TOKEN_DEFINED
0032
0033 template<class T> struct is_noncopyable: is_base_and_derived<noncopyable_::base_token, T>
0034 {
0035 };
0036
0037 } // namespace boost
0038
0039 #endif // #ifndef BOOST_TYPE_TRAITS_IS_NONCOPYABLE_HPP_INCLUDED