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