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66 lines
1.9 KiB
66 lines
1.9 KiB
3 years ago
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///////////////////////////////////////////////////////////////////////////////
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/// \file is_noncopyable.hpp
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/// Utility for detecting when types are non-copyable
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PROTO_DETAIL_IS_NONCOPYABLE_HPP_EAN_19_07_2012
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#define BOOST_PROTO_DETAIL_IS_NONCOPYABLE_HPP_EAN_19_07_2012
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#include <boost/noncopyable.hpp>
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#include <boost/mpl/or.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/type_traits/is_base_of.hpp>
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#include <boost/type_traits/is_abstract.hpp>
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#include <boost/type_traits/is_function.hpp>
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#include <boost/proto/proto_fwd.hpp>
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namespace boost { namespace proto { namespace detail
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{
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// All classes derived from std::ios_base have these public nested types,
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// and are non-copyable. This is an imperfect test, but it's the best we
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// we can do.
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template<typename T>
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yes_type check_is_iostream(
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typename T::failure *
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, typename T::Init *
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, typename T::fmtflags *
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, typename T::iostate *
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, typename T::openmode *
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, typename T::seekdir *
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);
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template<typename T>
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no_type check_is_iostream(...);
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template<typename T>
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struct is_iostream
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{
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static bool const value = sizeof(yes_type) == sizeof(check_is_iostream<T>(0,0,0,0,0,0));
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typedef mpl::bool_<value> type;
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};
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/// INTERNAL ONLY
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// This should be a customization point. And it serves the same purpose
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// as the is_noncopyable trait in Boost.Foreach.
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template<typename T>
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struct is_noncopyable
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: mpl::or_<
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is_function<T>
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, is_abstract<T>
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, is_iostream<T>
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, is_base_of<noncopyable, T>
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>
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{};
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template<typename T, std::size_t N>
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struct is_noncopyable<T[N]>
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: mpl::true_
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{};
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}}}
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#endif
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