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Contents
// Copyright Daniel Wallin, David Abrahams 2010.
// 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_PARAMETER_IS_MAYBE_050329_HPP
#define BOOST_PARAMETER_IS_MAYBE_050329_HPP
namespace boost { namespace parameter { namespace aux {
struct maybe_base
{
};
}}} // namespace boost::parameter::aux
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
#include <type_traits>
namespace boost { namespace parameter { namespace aux {
template <typename T>
using is_maybe = ::std::is_base_of<
::boost::parameter::aux::maybe_base
, typename ::std::remove_const<T>::type
>;
}}} // namespace boost::parameter::aux
#else // !defined(BOOST_PARAMETER_CAN_USE_MP11)
#include <boost/mpl/bool.hpp>
#include <boost/mpl/if.hpp>
#include <boost/type_traits/is_base_of.hpp>
#include <boost/type_traits/remove_const.hpp>
namespace boost { namespace parameter { namespace aux {
template <typename T>
struct is_maybe
: ::boost::mpl::if_<
::boost::is_base_of<
::boost::parameter::aux::maybe_base
, typename ::boost::remove_const<T>::type
>
, ::boost::mpl::true_
, ::boost::mpl::false_
>::type
{
};
}}} // namespace boost::parameter::aux
#endif // BOOST_PARAMETER_CAN_USE_MP11
#endif // include guard
Version data entries
14 entries across 14 versions & 1 rubygems