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/* Copyright 2006-2009 Joaquin M Lopez Munoz.
* 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)
*
* See http://www.boost.org/libs/flyweight for library home page.
*/
#ifndef BOOST_FLYWEIGHT_DETAIL_NESTED_XXX_IF_NOT_PH_HPP
#define BOOST_FLYWEIGHT_DETAIL_NESTED_XXX_IF_NOT_PH_HPP
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/flyweight/detail/is_placeholder_expr.hpp>
#include <boost/mpl/if.hpp>
/* nested_##name##_if_not_placeholder_expression<T>::type is T::name unless
* T is an MPL placeholder expression, in which case it defaults to int.
*/
#define BOOST_FLYWEIGHT_NESTED_XXX_IF_NOT_PLACEHOLDER_EXPRESSION_DEF(name) \
struct nested_##name##_if_not_placeholder_expression_helper \
{ \
typedef int name; \
}; \
\
template<typename T> \
struct nested_##name##_if_not_placeholder_expression \
{ \
typedef typename boost::mpl::if_< \
boost::flyweights::detail::is_placeholder_expression<T>, \
nested_##name##_if_not_placeholder_expression_helper, \
T \
>::type::name type; \
};
#endif
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