forked from boostorg/fusion
330 lines
11 KiB
C++
330 lines
11 KiB
C++
/*=============================================================================
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Copyright (c) 2005-2006 João 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/and.hpp>
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#include <boost/mpl/less.hpp>
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#include <boost/mpl/equal_to.hpp>
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#include <boost/mpl/size_t.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/blank.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_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/function_types/function_arity.hpp>
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#include <boost/utility/result_of.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 result_of
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{
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template <typename Function, class Sequence> struct invoke;
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}
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template <typename Function, class Sequence>
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inline typename result_of::invoke<Function, Sequence>::type
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invoke(Function, Sequence &);
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template <typename Function, class Sequence>
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inline typename result_of::invoke<Function, Sequence const>::type
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invoke(Function, Sequence const &);
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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 MFP = ft::is_member_function_pointer<Function>::value,
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bool RandomAccess = traits::is_random_access<Sequence>::value
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>
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struct invoke_impl
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{
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typedef boost::blank result;
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};
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template <class Sequence, int N> struct invoke_param_types;
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template <typename Func, class N, bool CBI = true, typename Sig = void>
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// contains type member with the result, empty on error
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struct invoke_result
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: mpl::if_<
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mpl::or_<
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mpl::equal_to< ft::function_arity<Func>, N >,
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mpl::and_< ft::is_callable_builtin<Func, ft::variadic>,
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mpl::less< ft::function_arity<Func>, N > >
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>, ft::result_type<Func>, boost::blank
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>::type
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{ };
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template <typename Func, class N, typename Sig>
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struct invoke_result<Func,N,false,Sig>
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: boost::result_of<Sig>
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{ };
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// Transform for F so that boost::result_of< F(...) > works
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template <typename F> struct invoke_result_of_prep
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: mpl::if_< ft::is_function<F>, boost::add_reference<F>,
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boost::remove_cv<F>
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>::type
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{ };
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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 T, class C, class Sequence>
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struct invoke_data_member
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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_< is_convertible<that,C*>,
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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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template <typename _ = void>
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struct result
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: boost::add_reference<qualified_type>
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{ };
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static inline typename 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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template <typename T, class C, class Sequence>
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struct invoke_impl<T C::*, Sequence, 1, true, false, false>
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: detail::invoke_data_member<T, C, Sequence>
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{ };
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template <typename T, class C, class Sequence>
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struct invoke_impl<T C::*, Sequence, 1, true, false, true>
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: detail::invoke_data_member<T, C, Sequence>
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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> struct invoke
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: detail::invoke_impl<
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typename boost::remove_reference<Function>::type, Sequence
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>::template result<>
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{ };
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}
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template <typename Function, class Sequence>
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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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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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template <typename Function, class Sequence, bool CBI>
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struct invoke_impl<Function,Sequence,N,CBI,false,true>
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{
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private:
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typedef typename invoke_result_of_prep<Function>::type func;
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public:
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template <typename _ = void>
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struct result
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: invoke_result< Function, mpl::size_t<N>, CBI,
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#define M(z,j,data) typename result_of::at_c<Sequence,j>::type
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func(BOOST_PP_ENUM(N,M,~)) >
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#undef M
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{ };
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template <typename F>
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static inline typename result<F>::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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};
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#if N > 0
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template <typename Function, class Sequence>
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struct invoke_impl<Function,Sequence,N,true,true,true>
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{
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public:
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template <typename _ = void>
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struct result
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: invoke_result< Function, mpl::size_t<N> >
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{ };
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template <typename F>
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static inline typename result<F>::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, bool CBI>
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struct invoke_impl<Function,Sequence,N,CBI,false,false>
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{
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private:
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typedef typename invoke_result_of_prep<Function>::type func;
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typedef invoke_param_types<Sequence,N> seq;
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public:
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template <typename _ = void>
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struct result
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: invoke_result< Function, mpl::size_t<N>, CBI,
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func(BOOST_PP_ENUM_PARAMS(N,typename seq::T)) >
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{ };
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template <typename F>
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static inline typename result<F>::type
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call(F & f, Sequence & s)
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{
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#if N > 0
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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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#endif
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return f( BOOST_PP_ENUM_PARAMS(N,*i) );
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}
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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_impl<Function,Sequence,N,true,true,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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template <typename _ = void>
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struct result
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: invoke_result< Function, mpl::size_t<N> >
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{ };
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template <typename F>
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static inline typename result<F>::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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