415 lines
14 KiB
C++
415 lines
14 KiB
C++
/*=============================================================================
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Copyright (c) 2005-2006 Joao Abecasis
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Copyright (c) 2006-2007 Tobias Schwinger
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Use modification and distribution are subject to the Boost Software
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License, Version 1.0. (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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#if !defined(BOOST_FUSION_FUNCTIONAL_INVOCATION_INVOKE_HPP_INCLUDED)
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#if !defined(BOOST_PP_IS_ITERATING)
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/iteration/iterate.hpp>
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#include <boost/preprocessor/arithmetic/dec.hpp>
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#include <boost/preprocessor/repetition/repeat_from_to.hpp>
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#include <boost/preprocessor/repetition/enum.hpp>
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#include <boost/preprocessor/repetition/enum_shifted.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_shifted_params.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/or.hpp>
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#include <boost/mpl/front.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/type_traits/add_const.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/type_traits/add_reference.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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#include <boost/function_types/is_function.hpp>
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#include <boost/function_types/is_callable_builtin.hpp>
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#include <boost/function_types/is_member_pointer.hpp>
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#include <boost/function_types/is_member_function_pointer.hpp>
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#include <boost/function_types/result_type.hpp>
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#include <boost/function_types/parameter_types.hpp>
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#include <boost/utility/result_of.hpp>
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#include <boost/core/enable_if.hpp>
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#include <boost/fusion/support/category_of.hpp>
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#include <boost/fusion/sequence/intrinsic/at.hpp>
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#include <boost/fusion/sequence/intrinsic/size.hpp>
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#include <boost/fusion/sequence/intrinsic/front.hpp>
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#include <boost/fusion/sequence/intrinsic/begin.hpp>
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#include <boost/fusion/iterator/next.hpp>
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#include <boost/fusion/iterator/deref.hpp>
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#include <boost/fusion/functional/invocation/limits.hpp>
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#include <boost/fusion/functional/invocation/detail/that_ptr.hpp>
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namespace boost { namespace fusion
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{
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namespace detail
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{
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namespace ft = function_types;
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template<
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typename Function, class Sequence,
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int N = result_of::size<Sequence>::value,
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bool CBI = ft::is_callable_builtin<Function>::value,
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bool RandomAccess = traits::is_random_access<Sequence>::value,
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typename Enable = void
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>
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struct invoke_impl;
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template <class Sequence, int N>
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struct invoke_param_types;
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template <typename T, class Sequence>
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struct invoke_data_member;
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template <typename Function, class Sequence, int N, bool RandomAccess>
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struct invoke_fn_ptr;
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template <typename Function, class Sequence, int N, bool RandomAccess>
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struct invoke_mem_fn;
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#define BOOST_PP_FILENAME_1 <boost/fusion/functional/invocation/invoke.hpp>
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#define BOOST_PP_ITERATION_LIMITS (0, BOOST_FUSION_INVOKE_MAX_ARITY)
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#include BOOST_PP_ITERATE()
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template <typename F, class Sequence, int N, bool RandomAccess>
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struct invoke_nonmember_builtin
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// use same implementation as for function objects but...
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: invoke_fn_ptr< // ...work around boost::result_of bugs
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typename mpl::eval_if< ft::is_function<F>,
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boost::add_reference<F>, boost::remove_cv<F> >::type,
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Sequence, N, RandomAccess >
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{ };
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template <typename Function, class Sequence, int N, bool RandomAccess, typename Enable>
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struct invoke_impl<Function,Sequence,N,true,RandomAccess,Enable>
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: mpl::if_< ft::is_member_function_pointer<Function>,
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invoke_mem_fn<Function,Sequence,N,RandomAccess>,
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invoke_nonmember_builtin<Function,Sequence,N,RandomAccess>
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>::type
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{ };
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template <typename Function, class Sequence, bool RandomAccess, typename Enable>
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struct invoke_impl<Function,Sequence,1,true,RandomAccess,Enable>
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: mpl::eval_if< ft::is_member_pointer<Function>,
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mpl::if_< ft::is_member_function_pointer<Function>,
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invoke_mem_fn<Function,Sequence,1,RandomAccess>,
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invoke_data_member<Function, Sequence> >,
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mpl::identity< invoke_nonmember_builtin<
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Function,Sequence,1,RandomAccess> >
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>::type
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{ };
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template <typename T, class C, class Sequence>
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struct invoke_data_member< T C::*, Sequence >
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{
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private:
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typedef typename result_of::front<Sequence>::type that;
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typedef mpl::or_< boost::is_convertible<that,C*>,
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boost::is_convertible<that,C&>,
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non_const_pointee<that> > non_const_cond;
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typedef typename mpl::eval_if< non_const_cond,
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mpl::identity<C>, add_const<C> >::type qualified_class;
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typedef typename mpl::eval_if< non_const_cond,
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mpl::identity<T>, add_const<T> >::type qualified_type;
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public:
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typedef typename boost::add_reference<qualified_type>::type
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result_type;
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static inline result_type call(T C::* f, Sequence & s)
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{
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typename result_of::front<Sequence>::type c = fusion::front(s);
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return that_ptr<qualified_class>::get(c)->*f;
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}
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};
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}
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namespace result_of
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{
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template <typename Function, class Sequence, typename = void>
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struct invoke;
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template <typename Function, class Sequence>
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struct invoke<Function, Sequence,
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typename enable_if_has_type<
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typename detail::invoke_impl<
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typename boost::remove_reference<Function>::type, Sequence
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>::result_type
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>::type>
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{
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typedef typename detail::invoke_impl<
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typename boost::remove_reference<Function>::type, Sequence
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>::result_type type;
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};
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}
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template <typename Function, class Sequence>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline typename result_of::invoke<Function,Sequence>::type
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invoke(Function f, Sequence & s)
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{
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return detail::invoke_impl<
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typename boost::remove_reference<Function>::type,Sequence
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>::call(f,s);
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}
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template <typename Function, class Sequence>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline typename result_of::invoke<Function,Sequence const>::type
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invoke(Function f, Sequence const & s)
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{
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return detail::invoke_impl<
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typename boost::remove_reference<Function>::type,Sequence const
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>::call(f,s);
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}
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}}
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#define BOOST_FUSION_FUNCTIONAL_INVOCATION_INVOKE_HPP_INCLUDED
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#else // defined(BOOST_PP_IS_ITERATING)
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///////////////////////////////////////////////////////////////////////////////
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//
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// Preprocessor vertical repetition code
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//
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///////////////////////////////////////////////////////////////////////////////
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#define N BOOST_PP_ITERATION()
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#define M(z,j,data) typename result_of::at_c<Sequence,j>::type
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template <typename Function, class Sequence>
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struct invoke_impl<Function,Sequence,N,false,true,
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typename enable_if_has_type<
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typename boost::result_of<Function(BOOST_PP_ENUM(N,M,~)) >::type
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>::type>
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{
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public:
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typedef typename boost::result_of<
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Function(BOOST_PP_ENUM(N,M,~)) >::type result_type;
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#undef M
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#if N > 0
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template <typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static inline result_type
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call(F & f, Sequence & s)
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{
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#define M(z,j,data) fusion::at_c<j>(s)
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return f( BOOST_PP_ENUM(N,M,~) );
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}
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#else
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template <typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static inline result_type
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call(F & f, Sequence & /*s*/)
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{
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return f();
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}
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#endif
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};
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template <typename Function, class Sequence>
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struct invoke_fn_ptr<Function,Sequence,N,true>
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{
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public:
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typedef typename ft::result_type<Function>::type result_type;
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#if N > 0
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template <typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static inline result_type
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call(F & f, Sequence & s)
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{
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#define M(z,j,data) fusion::at_c<j>(s)
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return f( BOOST_PP_ENUM(N,M,~) );
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}
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#else
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template <typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static inline result_type
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call(F & f, Sequence & /*s*/)
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{
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return f();
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}
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#endif
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};
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#if N > 0
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template <typename Function, class Sequence>
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struct invoke_mem_fn<Function,Sequence,N,true>
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{
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public:
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typedef typename ft::result_type<Function>::type result_type;
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template <typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static inline result_type
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call(F & f, Sequence & s)
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{
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return (that_ptr<typename mpl::front<
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ft::parameter_types<Function> >::type
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>::get(fusion::at_c<0>(s))->*f)(BOOST_PP_ENUM_SHIFTED(N,M,~));
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}
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};
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#endif
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#undef M
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#define M(z,j,data) \
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typename seq::I##j i##j = \
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fusion::next(BOOST_PP_CAT(i,BOOST_PP_DEC(j)));
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template <typename Function, class Sequence>
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struct invoke_impl<Function,Sequence,N,false,false,
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typename enable_if_has_type<
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#define L(z,j,data) typename invoke_param_types<Sequence,N>::BOOST_PP_CAT(T, j)
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typename boost::result_of<Function(BOOST_PP_ENUM(N,L,~))>::type
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>::type>
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#undef L
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{
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private:
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typedef invoke_param_types<Sequence,N> seq;
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public:
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typedef typename boost::result_of<
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Function(BOOST_PP_ENUM_PARAMS(N,typename seq::T))
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>::type result_type;
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#if N > 0
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template <typename F>
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static inline result_type
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call(F & f, Sequence & s)
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{
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typename seq::I0 i0 = fusion::begin(s);
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BOOST_PP_REPEAT_FROM_TO(1,N,M,~)
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return f( BOOST_PP_ENUM_PARAMS(N,*i) );
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}
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#else
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template <typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static inline result_type
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call(F & f, Sequence & /*s*/)
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{
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return f();
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}
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#endif
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};
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template <typename Function, class Sequence>
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struct invoke_fn_ptr<Function,Sequence,N,false>
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{
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private:
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typedef invoke_param_types<Sequence,N> seq;
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public:
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typedef typename ft::result_type<Function>::type result_type;
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#if N > 0
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template <typename F>
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static inline result_type
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call(F & f, Sequence & s)
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{
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typename seq::I0 i0 = fusion::begin(s);
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BOOST_PP_REPEAT_FROM_TO(1,N,M,~)
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return f( BOOST_PP_ENUM_PARAMS(N,*i) );
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}
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#else
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template <typename F>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static inline result_type
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call(F & f, Sequence & /*s*/)
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{
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return f();
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}
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#endif
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};
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#if N > 0
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template <typename Function, class Sequence>
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struct invoke_mem_fn<Function,Sequence,N,false>
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{
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private:
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typedef invoke_param_types<Sequence,N> seq;
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public:
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typedef typename ft::result_type<Function>::type result_type;
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template <typename F>
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static inline result_type
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call(F & f, Sequence & s)
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{
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typename seq::I0 i0 = fusion::begin(s);
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BOOST_PP_REPEAT_FROM_TO(1,N,M,~)
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return (that_ptr< typename mpl::front<
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ft::parameter_types<Function> >::type
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>::get(*i0)->*f)(BOOST_PP_ENUM_SHIFTED_PARAMS(N,*i));
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}
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};
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#endif
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#undef M
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template <class Sequence> struct invoke_param_types<Sequence,N>
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{
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#if N > 0
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typedef typename result_of::begin<Sequence>::type I0;
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typedef typename result_of::deref<I0>::type T0;
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#define M(z,i,data) \
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typedef typename result_of::next< \
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BOOST_PP_CAT(I,BOOST_PP_DEC(i))>::type I##i; \
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typedef typename result_of::deref<I##i>::type T##i;
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BOOST_PP_REPEAT_FROM_TO(1,N,M,~)
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#undef M
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#endif
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};
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#undef N
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#endif // defined(BOOST_PP_IS_ITERATING)
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#endif
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