40 lines
1.7 KiB
C++
40 lines
1.7 KiB
C++
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/* Copyright 2006-2009 Joaquin M Lopez Munoz.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* See http://www.boost.org/libs/flyweight for library home page.
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*/
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#ifndef BOOST_FLYWEIGHT_DETAIL_NESTED_XXX_IF_NOT_PH_HPP
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#define BOOST_FLYWEIGHT_DETAIL_NESTED_XXX_IF_NOT_PH_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/flyweight/detail/is_placeholder_expr.hpp>
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#include <boost/mpl/if.hpp>
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/* nested_##name##_if_not_placeholder_expression<T>::type is T::name unless
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* T is an MPL placeholder expression, in which case it defaults to int.
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*/
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#define BOOST_FLYWEIGHT_NESTED_XXX_IF_NOT_PLACEHOLDER_EXPRESSION_DEF(name) \
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struct nested_##name##_if_not_placeholder_expression_helper \
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{ \
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typedef int name; \
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}; \
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\
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template<typename T> \
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struct nested_##name##_if_not_placeholder_expression \
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{ \
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typedef typename boost::mpl::if_< \
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boost::flyweights::detail::is_placeholder_expression<T>, \
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nested_##name##_if_not_placeholder_expression_helper, \
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T \
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>::type::name type; \
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};
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#endif
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