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58 lines
2.2 KiB
58 lines
2.2 KiB
/* Copyright 2006-2008 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_NOT_PLACEHOLDER_EXPR_HPP |
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#define BOOST_FLYWEIGHT_DETAIL_NOT_PLACEHOLDER_EXPR_HPP |
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#if defined(_MSC_VER)&&(_MSC_VER>=1200) |
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#pragma once |
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#endif |
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/* BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION can be inserted at the end |
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* of a class template parameter declaration: |
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* template< |
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* typename X0,...,typename Xn |
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* BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION |
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* > |
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* struct foo... |
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* to prevent instantiations from being treated as MPL placeholder |
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* expressions in the presence of placeholder arguments; this is useful |
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* to avoid masking of a metafunction class nested ::apply during |
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* MPL invocation. |
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*/ |
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#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ |
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#include <boost/detail/workaround.hpp> |
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#if BOOST_WORKAROUND(__GNUC__, <4)||\ |
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BOOST_WORKAROUND(__GNUC__,==4)&&(__GNUC_MINOR__<2) |
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/* The default trick on which the macro is based, namely adding a int=0 |
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* defaulted template parameter, does not work in GCC prior to 4.2 due to |
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* an unfortunate compiler non-standard extension, as explained in |
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* http://lists.boost.org/boost-users/2007/07/29866.php |
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* We resort to an uglier technique, adding defaulted template parameters |
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* so as to exceed BOOST_MPL_LIMIT_METAFUNCTION_ARITY. |
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*/ |
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#include <boost/mpl/limits/arity.hpp> |
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#include <boost/preprocessor/facilities/intercept.hpp> |
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#include <boost/preprocessor/repetition/enum_trailing_params.hpp> |
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#define BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION \ |
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BOOST_PP_ENUM_TRAILING_PARAMS( \ |
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BOOST_MPL_LIMIT_METAFUNCTION_ARITY,typename=int BOOST_PP_INTERCEPT) |
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#define BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION_DEF \ |
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BOOST_PP_ENUM_TRAILING_PARAMS( \ |
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BOOST_MPL_LIMIT_METAFUNCTION_ARITY,typename BOOST_PP_INTERCEPT) |
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#else |
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#define BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION ,int=0 |
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#define BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION_DEF ,int |
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#endif |
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#endif
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