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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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