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/*=============================================================================
Copyright (c) 2005-2006 Joao Abecasis
Copyright (c) 2006-2007 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).
==============================================================================*/
#if !defined(BOOST_FUSION_FUNCTIONAL_INVOCATION_INVOKE_FUNCTION_OBJECT_HPP_INCLUDED)
#if !defined(BOOST_PP_IS_ITERATING)
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/preprocessor/arithmetic/dec.hpp>
#include <boost/preprocessor/repetition/repeat_from_to.hpp>
#include <boost/preprocessor/repetition/enum.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/utility/result_of.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/type_traits/remove_const.hpp>
#include <boost/utility/result_of.hpp>
#include <boost/fusion/support/category_of.hpp>
#include <boost/fusion/sequence/intrinsic/size.hpp>
#include <boost/fusion/sequence/intrinsic/at.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
#include <boost/fusion/iterator/next.hpp>
#include <boost/fusion/iterator/deref.hpp>
#include <boost/fusion/functional/invocation/limits.hpp>
namespace boost { namespace fusion
{
namespace result_of
{
template <class Function, class Sequence> struct invoke_function_object;
}
template <class Function, class Sequence>
inline typename result_of::invoke_function_object<Function, Sequence>::type
invoke_function_object(Function, Sequence &);
template <class Function, class Sequence>
inline typename result_of::invoke_function_object<Function, Sequence const
>::type invoke_function_object(Function, Sequence const &);
//----- ---- --- -- - - - -
namespace detail
{
template<
class Function, class Sequence,
int N = result_of::size<Sequence>::value,
bool RandomAccess = traits::is_random_access<Sequence>::value
>
struct invoke_function_object_impl;
template <class Sequence, int N>
struct invoke_function_object_param_types;
#define BOOST_PP_FILENAME_1 \
<boost/fusion/functional/invocation/invoke_function_object.hpp>
#define BOOST_PP_ITERATION_LIMITS \
(0, BOOST_FUSION_INVOKE_FUNCTION_OBJECT_MAX_ARITY)
#include BOOST_PP_ITERATE()
}
namespace result_of
{
template <class Function, class Sequence> struct invoke_function_object
{
typedef typename detail::invoke_function_object_impl<
typename boost::remove_reference<Function>::type, Sequence
>::result_type type;
};
}
template <class Function, class Sequence>
inline typename result_of::invoke_function_object<Function,Sequence>::type
invoke_function_object(Function f, Sequence & s)
{
return detail::invoke_function_object_impl<
typename boost::remove_reference<Function>::type,Sequence
>::call(f,s);
}
template <class Function, class Sequence>
inline typename result_of::invoke_function_object<Function,Sequence const>::type
invoke_function_object(Function f, Sequence const & s)
{
return detail::invoke_function_object_impl<
typename boost::remove_reference<Function>::type,Sequence const
>::call(f,s);
}
}}
#define BOOST_FUSION_FUNCTIONAL_INVOCATION_INVOKE_FUNCTION_OBJECT_HPP_INCLUDED
#else // defined(BOOST_PP_IS_ITERATING)
///////////////////////////////////////////////////////////////////////////////
//
// Preprocessor vertical repetition code
//
///////////////////////////////////////////////////////////////////////////////
#define N BOOST_PP_ITERATION()
template <class Function, class Sequence>
struct invoke_function_object_impl<Function,Sequence,N,true>
{
public:
typedef typename boost::result_of<
#define M(z,j,data) \
typename result_of::at_c<Sequence,j>::type
Function (BOOST_PP_ENUM(N,M,~)) >::type result_type;
#undef M
#if N > 0
template <class F>
static inline result_type
call(F & f, Sequence & s)
{
#define M(z,j,data) fusion::at_c<j>(s)
return f( BOOST_PP_ENUM(N,M,~) );
#undef M
}
#else
template <class F>
static inline result_type
call(F & f, Sequence & /*s*/)
{
return f();
}
#endif
};
template <class Function, class Sequence>
struct invoke_function_object_impl<Function,Sequence,N,false>
{
private:
typedef invoke_function_object_param_types<Sequence,N> seq;
public:
typedef typename boost::result_of<
Function (BOOST_PP_ENUM_PARAMS(N,typename seq::T))
>::type result_type;
#if N > 0
template <class F>
static inline result_type
call(F & f, Sequence & s)
{
typename seq::I0 i0 = fusion::begin(s);
#define M(z,j,data) \
typename seq::I##j i##j = \
fusion::next(BOOST_PP_CAT(i,BOOST_PP_DEC(j)));
BOOST_PP_REPEAT_FROM_TO(1,N,M,~)
#undef M
return f( BOOST_PP_ENUM_PARAMS(N,*i) );
}
#else
template <class F>
static inline result_type
call(F & f, Sequence & /*s*/)
{
return f();
}
#endif
};
template <class Sequence>
struct invoke_function_object_param_types<Sequence,N>
{
#if N > 0
typedef typename result_of::begin<Sequence>::type I0;
typedef typename result_of::deref<I0>::type T0;
#define M(z,i,data) \
typedef typename result_of::next< \
BOOST_PP_CAT(I,BOOST_PP_DEC(i))>::type I##i; \
typedef typename result_of::deref<I##i>::type T##i;
BOOST_PP_REPEAT_FROM_TO(1,N,M,~)
#undef M
#endif
};
#undef N
#endif // defined(BOOST_PP_IS_ITERATING)
#endif
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