/*============================================================================= | |
Copyright (c) 2007 Tobias Schwinger | |
Use modification and distribution are subject to 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). | |
==============================================================================*/ | |
#ifndef BOOST_FUNCTIONAL_LIGHTWEIGHT_FORWARD_ADAPTER_HPP_INCLUDED | |
# ifndef BOOST_PP_IS_ITERATING | |
# include <boost/config.hpp> | |
# include <boost/detail/workaround.hpp> | |
# include <boost/preprocessor/cat.hpp> | |
# include <boost/preprocessor/iteration/iterate.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/facilities/intercept.hpp> | |
# include <boost/utility/result_of.hpp> | |
# include <boost/ref.hpp> | |
# ifndef BOOST_FUNCTIONAL_LIGHTWEIGHT_FORWARD_ADAPTER_MAX_ARITY | |
# define BOOST_FUNCTIONAL_LIGHTWEIGHT_FORWARD_ADAPTER_MAX_ARITY 10 | |
# elif BOOST_FUNCTIONAL_FORDWARD_ADAPTER_MAX_ARITY < 3 | |
# undef BOOST_FUNCTIONAL_LIGHTWEIGHT_FORWARD_ADAPTER_MAX_ARITY | |
# define BOOST_FUNCTIONAL_LIGHTWEIGHT_FORWARD_ADAPTER_MAX_ARITY 3 | |
# endif | |
namespace boost | |
{ | |
template< typename Function, int Arity_Or_MinArity = -1, int MaxArity = -1 > | |
class lightweight_forward_adapter; | |
//----- ---- --- -- - - - - | |
namespace detail | |
{ | |
template< class MostDerived, typename Function, typename FunctionConst, | |
int Arity, int MinArity > | |
struct lightweight_forward_adapter_impl; | |
struct lightweight_forward_adapter_result | |
{ | |
template< typename Sig > struct apply; | |
// Utility metafunction for argument transform | |
template< typename T > struct x { typedef T const& t; }; | |
template< typename T > struct x< boost::reference_wrapper<T> > | |
{ typedef T& t; }; | |
template< typename T > struct x<T&> : x<T> { }; | |
template< typename T > struct x<T const&> : x<T> { }; | |
template< typename T > struct x<T const> : x<T> { }; | |
// Utility metafunction to choose target function qualification | |
template< typename T > struct c | |
{ typedef typename T::target_function_t t; }; | |
template< typename T > struct c<T& > | |
{ typedef typename T::target_function_t t; }; | |
template< typename T > struct c<T const > | |
{ typedef typename T::target_function_const_t t; }; | |
template< typename T > struct c<T const&> | |
{ typedef typename T::target_function_const_t t; }; | |
}; | |
} | |
# define BOOST_TMP_MACRO(f,fn,fc) \ | |
boost::detail::lightweight_forward_adapter_impl< \ | |
lightweight_forward_adapter<f,Arity_Or_MinArity,MaxArity>, fn, fc, \ | |
(MaxArity!=-1? MaxArity :Arity_Or_MinArity!=-1? Arity_Or_MinArity \ | |
:BOOST_FUNCTIONAL_LIGHTWEIGHT_FORWARD_ADAPTER_MAX_ARITY), \ | |
(Arity_Or_MinArity!=-1? Arity_Or_MinArity : 0) > | |
template< typename Function, int Arity_Or_MinArity, int MaxArity > | |
class lightweight_forward_adapter | |
: public BOOST_TMP_MACRO(Function,Function,Function const) | |
, private Function | |
{ | |
public: | |
lightweight_forward_adapter(Function const& f = Function()) | |
: Function(f) | |
{ } | |
typedef Function target_function_t; | |
typedef Function const target_function_const_t; | |
Function & target_function() { return *this; } | |
Function const & target_function() const { return *this; } | |
template< typename Sig > struct result | |
: detail::lightweight_forward_adapter_result::template apply<Sig> | |
{ }; | |
using BOOST_TMP_MACRO(Function,Function, Function const)::operator(); | |
}; | |
template< typename Function, int Arity_Or_MinArity, int MaxArity > | |
class lightweight_forward_adapter< Function const, Arity_Or_MinArity, | |
MaxArity > | |
: public BOOST_TMP_MACRO(Function const, Function const, Function const) | |
, private Function | |
{ | |
public: | |
lightweight_forward_adapter(Function const& f = Function()) | |
: Function(f) | |
{ } | |
typedef Function const target_function_t; | |
typedef Function const target_function_const_t; | |
Function const & target_function() const { return *this; } | |
template< typename Sig > struct result | |
: detail::lightweight_forward_adapter_result::template apply<Sig> | |
{ }; | |
using BOOST_TMP_MACRO(Function const,Function const, Function const) | |
::operator(); | |
}; | |
template< typename Function, int Arity_Or_MinArity, int MaxArity > | |
class lightweight_forward_adapter< Function &, Arity_Or_MinArity, MaxArity > | |
: public BOOST_TMP_MACRO(Function&, Function, Function) | |
{ | |
Function& ref_function; | |
public: | |
lightweight_forward_adapter(Function& f) | |
: ref_function(f) | |
{ } | |
typedef Function target_function_t; | |
typedef Function target_function_const_t; | |
Function & target_function() const { return this->ref_function; } | |
template< typename Sig > struct result | |
: detail::lightweight_forward_adapter_result::template apply<Sig> | |
{ }; | |
using BOOST_TMP_MACRO(Function&, Function, Function)::operator(); | |
}; | |
#undef BOOST_TMP_MACRO | |
namespace detail | |
{ | |
template< class Self > | |
struct lightweight_forward_adapter_result::apply< Self() > | |
: boost::result_of< typename c<Self>::t() > | |
{ }; | |
template< class MD, class F, class FC > | |
struct lightweight_forward_adapter_impl<MD,F,FC,0,0> | |
: lightweight_forward_adapter_result | |
{ | |
inline typename boost::result_of< FC() >::type | |
operator()() const | |
{ | |
return static_cast<MD const*>(this)->target_function()(); | |
} | |
inline typename boost::result_of< F() >::type | |
operator()() | |
{ | |
return static_cast<MD*>(this)->target_function()(); | |
} | |
}; | |
# define BOOST_PP_FILENAME_1 \ | |
<boost/functional/lightweight_forward_adapter.hpp> | |
# define BOOST_PP_ITERATION_LIMITS \ | |
(1,BOOST_FUNCTIONAL_LIGHTWEIGHT_FORWARD_ADAPTER_MAX_ARITY) | |
# include BOOST_PP_ITERATE() | |
} // namespace detail | |
template<class F, int A0, int A1> | |
struct result_of<boost::lightweight_forward_adapter<F,A0,A1> const ()> | |
: boost::detail::lightweight_forward_adapter_result::template apply< | |
boost::lightweight_forward_adapter<F,A0,A1> const () > | |
{ }; | |
template<class F, int A0, int A1> | |
struct result_of<boost::lightweight_forward_adapter<F,A0,A1>()> | |
: boost::detail::lightweight_forward_adapter_result::template apply< | |
boost::lightweight_forward_adapter<F,A0,A1>() > | |
{ }; | |
template<class F, int A0, int A1> | |
struct result_of<boost::lightweight_forward_adapter<F,A0,A1> const& ()> | |
: boost::detail::lightweight_forward_adapter_result::template apply< | |
boost::lightweight_forward_adapter<F,A0,A1> const () > | |
{ }; | |
template<class F, int A0, int A1> | |
struct result_of<boost::lightweight_forward_adapter<F,A0,A1>& ()> | |
: boost::detail::lightweight_forward_adapter_result::template apply< | |
boost::lightweight_forward_adapter<F,A0,A1>() > | |
{ }; | |
} | |
# define BOOST_FUNCTIONAL_LIGHTWEIGHT_FORWARD_ADAPTER_HPP_INCLUDED | |
# else // defined(BOOST_PP_IS_ITERATING) | |
# define N BOOST_PP_ITERATION() | |
template< class Self, BOOST_PP_ENUM_PARAMS(N,typename T) > | |
struct lightweight_forward_adapter_result::apply< | |
Self (BOOST_PP_ENUM_PARAMS(N,T)) > | |
: boost::result_of< | |
typename c<Self>::t (BOOST_PP_ENUM_BINARY_PARAMS(N, | |
typename x<T,>::t BOOST_PP_INTERCEPT)) > | |
{ }; | |
template< class MD, class F, class FC > | |
struct lightweight_forward_adapter_impl<MD,F,FC,BOOST_PP_DEC(N),N> | |
: lightweight_forward_adapter_result | |
{ | |
template< BOOST_PP_ENUM_PARAMS(N,typename T) > | |
inline typename boost::result_of< F(BOOST_PP_ENUM_BINARY_PARAMS(N, | |
T,const& BOOST_PP_INTERCEPT)) >::type | |
operator()(BOOST_PP_ENUM_BINARY_PARAMS(N,T,& BOOST_PP_INTERCEPT)); | |
}; | |
template< class MD, class F, class FC, int MinArity > | |
struct lightweight_forward_adapter_impl<MD,F,FC,N,MinArity> | |
: lightweight_forward_adapter_impl<MD,F,FC,BOOST_PP_DEC(N),MinArity> | |
{ | |
using lightweight_forward_adapter_impl<MD,F,FC,BOOST_PP_DEC(N), | |
MinArity>::operator(); | |
# define M(z,i,d) \ | |
static_cast<typename d::template x<T##i>::t>(a##i) | |
template< BOOST_PP_ENUM_PARAMS(N,typename T) > | |
inline typename lightweight_forward_adapter_result::template apply< | |
MD const (BOOST_PP_ENUM_BINARY_PARAMS(N, | |
T,const& BOOST_PP_INTERCEPT)) >::type | |
operator()(BOOST_PP_ENUM_BINARY_PARAMS(N,T,const& a)) const | |
{ | |
typedef lightweight_forward_adapter_result _; | |
return static_cast<MD const*>(this)->target_function()( | |
BOOST_PP_ENUM(N,M,_)); | |
} | |
template< BOOST_PP_ENUM_PARAMS(N,typename T) > | |
inline typename lightweight_forward_adapter_result::template apply< | |
MD (BOOST_PP_ENUM_BINARY_PARAMS(N, | |
T,const& BOOST_PP_INTERCEPT)) >::type | |
operator()(BOOST_PP_ENUM_BINARY_PARAMS(N,T,const& a)) | |
{ | |
typedef lightweight_forward_adapter_result _; | |
return static_cast<MD*>(this)->target_function()( | |
BOOST_PP_ENUM(N,M,_)); | |
} | |
# undef M | |
}; | |
# undef N | |
# endif // defined(BOOST_PP_IS_ITERATING) | |
#endif // include guard | |