76 lines
2.7 KiB
C++
76 lines
2.7 KiB
C++
/* 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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/* no include guards */
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#include <boost/preprocessor/arithmetic/add.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/repetition/enum.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/repeat.hpp>
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#include <boost/preprocessor/repetition/repeat_from_to.hpp>
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#include <boost/preprocessor/seq/elem.hpp>
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#include <boost/preprocessor/seq/for_each_product.hpp>
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#include <boost/preprocessor/seq/size.hpp>
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#define BOOST_FLYWEIGHT_CONST(b) BOOST_PP_CAT(BOOST_FLYWEIGHT_CONST,b)
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#define BOOST_FLYWEIGHT_CONST0
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#define BOOST_FLYWEIGHT_CONST1 const
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/* if mask[n]==0 --> Tn& tn
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* if mask[n]==1 --> const Tn& tn
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*/
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#define BOOST_FLYWEIGHT_PERFECT_FWD_ARG(z,n,mask) \
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BOOST_FLYWEIGHT_CONST(BOOST_PP_SEQ_ELEM(n,mask)) \
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BOOST_PP_CAT(T,n)& BOOST_PP_CAT(t,n)
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/* overload accepting size(mask) args, where the template args are
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* marked const or not according to the given mask (a seq of 0 or 1)
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*/
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#define BOOST_FLYWEIGHT_PERFECT_FWD(r,mask) \
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template<BOOST_PP_ENUM_PARAMS(BOOST_PP_SEQ_SIZE(mask),typename T)> \
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BOOST_FLYWEIGHT_PERFECT_FWD_NAME( \
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BOOST_PP_ENUM( \
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BOOST_PP_SEQ_SIZE(mask),BOOST_FLYWEIGHT_PERFECT_FWD_ARG,mask)) \
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BOOST_FLYWEIGHT_PERFECT_FWD_BODY(BOOST_PP_SEQ_SIZE(mask))
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#define BOOST_FLYWEIGHT_01(z,n,_) ((0)(1))
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/* Perfect forwarding overloads accepting 1 to n args */
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#define BOOST_FLYWEIGHT_PERFECT_FWDS_N(z,n,_) \
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BOOST_PP_SEQ_FOR_EACH_PRODUCT( \
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BOOST_FLYWEIGHT_PERFECT_FWD, \
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BOOST_PP_REPEAT(n,BOOST_FLYWEIGHT_01,~))
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#define BOOST_FLYWEIGHT_PERFECT_FWD_OVERLOADS \
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BOOST_PP_REPEAT_FROM_TO( \
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1,BOOST_PP_ADD(BOOST_FLYWEIGHT_LIMIT_PERFECT_FWD_ARGS,1), \
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BOOST_FLYWEIGHT_PERFECT_FWDS_N,~)
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/* generate the overloads */
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BOOST_FLYWEIGHT_PERFECT_FWD_OVERLOADS
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/* clean up */
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#undef BOOST_FLYWEIGHT_PERFECT_FWD_OVERLOADS
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#undef BOOST_FLYWEIGHT_01
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#undef BOOST_FLYWEIGHT_PERFECT_FWD
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#undef BOOST_FLYWEIGHT_PERFECT_FWD_ARG
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#undef BOOST_FLYWEIGHT_CONST1
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#undef BOOST_FLYWEIGHT_CONST0
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#undef BOOST_FLYWEIGHT_CONST
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/* user supplied argument macros */
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#undef BOOST_FLYWEIGHT_PERFECT_FWD_BODY
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#undef BOOST_FLYWEIGHT_PERFECT_FWD_NAME
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