boost/smart_ptr/detail/sp_nullptr_t.hpp

#ifndef BOOST_SMART_PTR_DETAIL_SP_NULLPTR_T_HPP_INCLUDED
#define BOOST_SMART_PTR_DETAIL_SP_NULLPTR_T_HPP_INCLUDED
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
//  detail/sp_nullptr_t.hpp
//
//  Copyright 2013 Peter Dimov
//
//  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
#include <boost/config.hpp>
#include <cstddef>
#if !defined( BOOST_NO_CXX11_NULLPTR )
namespace boost
{
namespace detail
{
#if !defined( BOOST_NO_CXX11_DECLTYPE ) && ( ( defined( __clang__ ) && !defined( _LIBCPP_VERSION ) ) || defined( __INTEL_COMPILER ) )
    typedef decltype(nullptr) sp_nullptr_t;
#else
    typedef std::nullptr_t sp_nullptr_t;
#endif
} // namespace detail
} // namespace boost
#endif // !defined( BOOST_NO_CXX11_NULLPTR )
#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_NULLPTR_T_HPP_INCLUDED