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Added for new Boost.Optional functionality

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[SVN r19995]
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Fernando Cacciola 2003-09-10 15:40:47 +00:00
parent 95ba7a4381
commit 4bfb534bae
1 changed files with 73 additions and 0 deletions
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include/boost/utility/in_place_factory.hpp Normal file
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// (C) 2002, Fernando Luis Cacciola Carballal.
//
// This material is provided "as is", with absolutely no warranty expressed
// or implied. Any use is at your own risk.
//
// Permission to use or copy this software for any purpose is hereby granted
// without fee, provided the above notices are retained on all copies.
// Permission to modify the code and to distribute modified code is granted,
// provided the above notices are retained, and a notice that the code was
// modified is included with the above copyright notice.
//
// You are welcome to contact the author at:
// fernando_cacciola@hotmail.com
//
#ifndef BOOST_UTILITY_INPLACE_FACTORY_25AGO2003_HPP
#define BOOST_UTILITY_INPLACE_FACTORY_25AGO2003_HPP
#include <boost/preprocessor/repetition/enum.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_binary_params.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/arithmetic/inc.hpp>
#include <boost/preprocessor/punctuation/paren.hpp>
#include <boost/preprocessor/facilities/empty.hpp>
#include <boost/type.hpp>
namespace boost {
class InPlaceFactoryBase {} ;
#define BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_INIT(z,n,_) BOOST_PP_CAT(m_a,n) BOOST_PP_LPAREN() BOOST_PP_CAT(a,n) BOOST_PP_RPAREN()
#define BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_DECL(z,n,_) BOOST_PP_CAT(A,n) const& BOOST_PP_CAT(m_a,n);
#define BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_ARG(z,n,_) BOOST_PP_CAT(m_a,n)
#define BOOST_DEFINE_INPLACE_FACTORY_CLASS(z,n,_) \
template< BOOST_PP_ENUM_PARAMS(BOOST_PP_INC(n),class A) > \
class BOOST_PP_CAT(InPlaceFactory, BOOST_PP_INC(n) ) : public InPlaceFactoryBase \
{ \
public: \
\
BOOST_PP_CAT(InPlaceFactory, BOOST_PP_INC(n) ) ( BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_INC(n),A,const& a) ) \
: \
BOOST_PP_ENUM( BOOST_PP_INC(n), BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_INIT, _ ) \
{} \
\
template<class T> \
void operator() ( boost::type<T>, void* address ) const \
{ \
new ( address ) T ( BOOST_PP_ENUM_PARAMS( BOOST_PP_INC(n), m_a ) ) ; \
} \
\
BOOST_PP_REPEAT( BOOST_PP_INC(n), BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_DECL, _) \
} ; \
\
template< BOOST_PP_ENUM_PARAMS(BOOST_PP_INC(n),class A) > \
BOOST_PP_CAT(InPlaceFactory, BOOST_PP_INC(n) ) < BOOST_PP_ENUM_PARAMS( BOOST_PP_INC(n), A ) > \
in_place ( BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_INC(n),A, const& a) ) \
{ \
return BOOST_PP_CAT(InPlaceFactory, BOOST_PP_INC(n) ) < BOOST_PP_ENUM_PARAMS( BOOST_PP_INC(n), A ) > \
( BOOST_PP_ENUM_PARAMS( BOOST_PP_INC(n), a ) ) ; \
} ; \
#define BOOST_MAX_INPLACE_FACTORY_ARITY 10
BOOST_PP_REPEAT( BOOST_MAX_INPLACE_FACTORY_ARITY, BOOST_DEFINE_INPLACE_FACTORY_CLASS, BOOST_PP_EMPTY() )
} // namespace boost
#endif