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/*==============================================================================
Copyright (c) 2005-2010 Joel de Guzman
Copyright (c) 2015 John Fletcher
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_PHOENIX_CORE_IS_VALUE_HPP
#define BOOST_PHOENIX_CORE_IS_VALUE_HPP
#include <boost/mpl/bool.hpp>
// Copied from is_actor.hpp
// Note to Thomas and any future maintainer: please make this as
// lightweight as possible (as it is right now).
namespace boost { namespace phoenix
{
///////////////////////////////////////////////////////////////////////////////
//
// is_value<T>
//
// Tests if T is a value. Evaluates to mpl::true_ or mpl::false_
//
///////////////////////////////////////////////////////////////////////////////
namespace expression {
template <typename T>
struct value;
}
template <typename T, typename Enable = void>
struct is_value
: mpl::false_
{};
template <typename T>
struct is_value<T const>
: is_value<T>
{};
template <typename T>
struct is_value<T &>
: is_value<T>
{};
// This does not seem to work.
// There is an alternative in value.hpp which does work.
template <typename T>
struct is_value< expression::value<T> >
: mpl::true_
{};
template <typename T>
bool is_val(T const & /* t */)
{
return is_value<T>::value;
}
}}
#endif
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