502 lines
16 KiB
C++
502 lines
16 KiB
C++
/*=============================================================================
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Copyright (c) 2007-2008 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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#ifndef BOOST_FUNCTIONAL_FORWARD_ADAPTER_HPP_INCLUDED
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# ifndef BOOST_PP_IS_ITERATING
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# include <boost/config.hpp>
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# include <boost/detail/workaround.hpp>
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# include <boost/preprocessor/iteration/iterate.hpp>
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# include <boost/preprocessor/repetition/enum_params.hpp>
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# include <boost/preprocessor/repetition/enum_binary_params.hpp>
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# include <boost/preprocessor/facilities/intercept.hpp>
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# include <boost/preprocessor/arithmetic/dec.hpp>
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# include <boost/utility/result_of.hpp>
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# ifndef BOOST_FUNCTIONAL_FORWARD_ADAPTER_MAX_ARITY
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# define BOOST_FUNCTIONAL_FORWARD_ADAPTER_MAX_ARITY 6
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# elif BOOST_FUNCTIONAL_FORWARD_ADAPTER_MAX_ARITY < 3
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# undef BOOST_FUNCTIONAL_FORWARD_ADAPTER_MAX_ARITY
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# define BOOST_FUNCTIONAL_FORWARD_ADAPTER_MAX_ARITY 3
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# endif
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namespace boost
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{
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template< typename Function, int Arity_Or_MinArity = -1, int MaxArity = -1 >
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class forward_adapter;
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//----- ---- --- -- - - - -
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namespace detail
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{
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template< class MostDerived, typename Function, typename FunctionConst,
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int Arity, int MinArity >
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struct forward_adapter_impl;
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struct forward_adapter_result
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{
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template< typename Sig > struct apply;
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// Utility metafunction for qualification adjustment on arguments
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template< typename T > struct q { typedef T const t; };
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template< typename T > struct q<T const> { typedef T const t; };
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template< typename T > struct q<T &> { typedef T t; };
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// Utility metafunction to choose target function qualification
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template< typename T > struct c
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{ typedef typename T::target_function_t t; };
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template< typename T > struct c<T& >
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{ typedef typename T::target_function_t t; };
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template< typename T > struct c<T const >
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{ typedef typename T::target_function_const_t t; };
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template< typename T > struct c<T const&>
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{ typedef typename T::target_function_const_t t; };
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};
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}
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# define BOOST_TMP_MACRO(f,fn,fc) \
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boost::detail::forward_adapter_impl< \
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forward_adapter<f,Arity_Or_MinArity,MaxArity>, fn, fc, \
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(MaxArity!=-1? MaxArity :Arity_Or_MinArity!=-1? Arity_Or_MinArity \
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:BOOST_FUNCTIONAL_FORWARD_ADAPTER_MAX_ARITY), \
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(Arity_Or_MinArity!=-1? Arity_Or_MinArity : 0) >
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template< typename Function, int Arity_Or_MinArity, int MaxArity >
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class forward_adapter
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: public BOOST_TMP_MACRO(Function,Function,Function const)
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, private Function
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{
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public:
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forward_adapter(Function const& f = Function())
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: Function(f)
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{ }
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typedef Function target_function_t;
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typedef Function const target_function_const_t;
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Function & target_function() { return *this; }
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Function const & target_function() const { return *this; }
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template< typename Sig > struct result
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: detail::forward_adapter_result::template apply<Sig>
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{ };
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using BOOST_TMP_MACRO(Function,Function, Function const)::operator();
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};
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template< typename Function, int Arity_Or_MinArity, int MaxArity >
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class forward_adapter< Function const, Arity_Or_MinArity, MaxArity >
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: public BOOST_TMP_MACRO(Function const, Function const, Function const)
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, private Function
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{
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public:
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forward_adapter(Function const& f = Function())
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: Function(f)
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{ }
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typedef Function const target_function_t;
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typedef Function const target_function_const_t;
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Function const & target_function() const { return *this; }
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template< typename Sig > struct result
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: detail::forward_adapter_result::template apply<Sig>
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{ };
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using BOOST_TMP_MACRO(Function const,Function const, Function const)
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::operator();
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};
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template< typename Function, int Arity_Or_MinArity, int MaxArity >
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class forward_adapter< Function &, Arity_Or_MinArity, MaxArity >
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: public BOOST_TMP_MACRO(Function&, Function, Function)
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{
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Function& ref_function;
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public:
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forward_adapter(Function& f)
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: ref_function(f)
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{ }
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typedef Function target_function_t;
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typedef Function target_function_const_t;
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Function & target_function() const { return this->ref_function; }
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template< typename Sig > struct result
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: detail::forward_adapter_result::template apply<Sig>
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{ };
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using BOOST_TMP_MACRO(Function&, Function, Function)::operator();
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};
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#undef BOOST_TMP_MACRO
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namespace detail
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{
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template< class Self >
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struct forward_adapter_result::apply< Self() >
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: boost::result_of< BOOST_DEDUCED_TYPENAME c<Self>::t() >
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{ };
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// WHen operator()() doesn't have any parameters, it can't
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// be templatized and can't use SFINAE, so intead use class
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// template parameter SFINAE to decide whether to instantiate it.
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template <typename T, typename R = void>
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struct forward_adapter_sfinae
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{
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typedef T type;
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};
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// This is the fallback for when there isn't an operator()(),
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// need to create an operator() that will never instantiate
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// so that using parent::operator() will work okay.
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template< class MD, class F, class FC, class Enable = void>
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struct forward_adapter_impl_zero
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{
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template <typename T> struct never_instantiate {};
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template <typename T>
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typename never_instantiate<T>::type operator()(T) const {}
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};
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template< class MD, class F, class FC>
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struct forward_adapter_impl_zero<MD, F, FC,
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typename forward_adapter_sfinae<typename boost::result_of< FC() >::type>::type>
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{
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inline typename boost::result_of< FC() >::type
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operator()() const
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{
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return static_cast<MD const*>(this)->target_function()();
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}
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inline typename boost::result_of< F() >::type
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operator()()
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{
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return static_cast<MD*>(this)->target_function()();
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}
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};
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template< class MD, class F, class FC >
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struct forward_adapter_impl<MD,F,FC,0,0>
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: forward_adapter_impl_zero<MD,F,FC>
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{
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using forward_adapter_impl_zero<MD,F,FC>::operator();
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// closing brace gets generated by preprocessing code, below
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# define BOOST_TMP_MACRO(tpl_params,arg_types,params,args) \
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template< tpl_params > \
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inline typename boost::result_of< FC(arg_types) >::type \
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operator()(params) const \
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{ \
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return static_cast<MD const*>(this)->target_function()(args); \
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} \
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template< tpl_params > \
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inline typename boost::result_of< F(arg_types)>::type \
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operator()(params) \
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{ \
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return static_cast<MD*>(this)->target_function()(args); \
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}
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# // This is the total number of iterations we need
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# define count ((1 << BOOST_FUNCTIONAL_FORWARD_ADAPTER_MAX_ARITY+1)-2)
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# // Chain file iteration to virtually one loop
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# if BOOST_FUNCTIONAL_FORWARD_ADAPTER_MAX_ARITY <= 7
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# define limit1 count
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# define limit2 0
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# define limit3 0
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# else
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# if BOOST_FUNCTIONAL_FORWARD_ADAPTER_MAX_ARITY <= 15
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# define limit1 (count >> 8)
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# define limit2 255
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# define limit3 0
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# else
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# define limit1 (count >> 16)
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# define limit2 255
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# define limit3 255
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# endif
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# endif
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# define N 0
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# define BOOST_PP_FILENAME_1 <boost/functional/forward_adapter.hpp>
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# define BOOST_PP_ITERATION_LIMITS (0,limit1)
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# include BOOST_PP_ITERATE()
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# undef N
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# undef limit3
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# undef limit2
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# undef limit1
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# undef count
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# undef BOOST_TMP_MACRO
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};
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} // namespace detail
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template<class F, int A0, int A1>
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struct result_of<boost::forward_adapter<F,A0,A1> const ()>
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: boost::detail::forward_adapter_result::template apply<
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boost::forward_adapter<F,A0,A1> const () >
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{ };
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template<class F, int A0, int A1>
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struct result_of<boost::forward_adapter<F,A0,A1>()>
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: boost::detail::forward_adapter_result::template apply<
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boost::forward_adapter<F,A0,A1>() >
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{ };
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template<class F, int A0, int A1>
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struct result_of<boost::forward_adapter<F,A0,A1> const& ()>
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: boost::detail::forward_adapter_result::template apply<
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boost::forward_adapter<F,A0,A1> const () >
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{ };
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template<class F, int A0, int A1>
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struct result_of<boost::forward_adapter<F,A0,A1>& ()>
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: boost::detail::forward_adapter_result::template apply<
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boost::forward_adapter<F,A0,A1>() >
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{ };
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}
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# define BOOST_FUNCTIONAL_FORWARD_ADAPTER_HPP_INCLUDED
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# elif BOOST_PP_ITERATION_DEPTH() == 1 && limit2
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# define BOOST_PP_FILENAME_2 <boost/functional/forward_adapter.hpp>
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# define BOOST_PP_ITERATION_LIMITS (0,limit2)
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# include BOOST_PP_ITERATE()
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# elif BOOST_PP_ITERATION_DEPTH() == 2 && limit3
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# define BOOST_PP_FILENAME_3 <boost/functional/forward_adapter.hpp>
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# define BOOST_PP_ITERATION_LIMITS (0,limit3)
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# include BOOST_PP_ITERATE()
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# else
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# // I is the loop counter
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# if limit2 && limit3
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# define I (BOOST_PP_ITERATION_1 << 16 | BOOST_PP_ITERATION_2 << 8 | \
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BOOST_PP_ITERATION_3)
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# elif limit2
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# define I (BOOST_PP_ITERATION_1 << 8 | BOOST_PP_ITERATION_2)
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# else
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# define I BOOST_PP_ITERATION_1
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# endif
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# if I < count
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# // Done for this arity? Increment N
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# if (I+2 >> N+1)
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# if N == 0
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# undef N
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# define N 1
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# elif N == 1
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# undef N
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# define N 2
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# elif N == 2
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# undef N
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# define N 3
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# elif N == 3
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# undef N
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# define N 4
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# elif N == 4
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# undef N
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# define N 5
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# elif N == 5
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# undef N
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# define N 6
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# elif N == 6
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# undef N
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# define N 7
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# elif N == 7
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# undef N
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# define N 8
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# elif N == 8
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# undef N
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# define N 9
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# elif N == 9
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# undef N
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# define N 10
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# elif N == 10
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# undef N
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# define N 11
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# elif N == 11
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# undef N
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# define N 12
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# elif N == 12
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# undef N
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# define N 13
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# elif N == 13
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# undef N
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# define N 14
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# elif N == 14
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# undef N
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# define N 15
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# elif N == 15
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# undef N
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# define N 16
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# endif
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};
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template< class Self, BOOST_PP_ENUM_PARAMS(N,typename T) >
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struct forward_adapter_result::apply< Self(BOOST_PP_ENUM_PARAMS(N,T)) >
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: boost::result_of<
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BOOST_DEDUCED_TYPENAME c<Self>::t(BOOST_PP_ENUM_BINARY_PARAMS(N,
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typename q<T,>::t& BOOST_PP_INTERCEPT)) >
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{ };
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template< class MD, class F, class FC >
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struct forward_adapter_impl<MD,F,FC,BOOST_PP_DEC(N),N>
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{
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template< BOOST_PP_ENUM_PARAMS(N,typename T) >
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inline typename boost::result_of< F(
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BOOST_PP_ENUM_BINARY_PARAMS(N,T,& BOOST_PP_INTERCEPT)) >::type
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operator()(BOOST_PP_ENUM_BINARY_PARAMS(N,T,& BOOST_PP_INTERCEPT));
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};
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template< class MD, class F, class FC, int MinArity >
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struct forward_adapter_impl<MD,F,FC,N,MinArity>
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: forward_adapter_impl<MD,F,FC,BOOST_PP_DEC(N),MinArity>
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{
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using forward_adapter_impl<MD,F,FC,BOOST_PP_DEC(N),MinArity>::operator();
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# endif
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# // Zero based count for each arity would be I-(1<<N)+2, but we don't
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# // need it, unless we need a nicer order.
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# // Macros for the parameter's type modifiers.
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# if I & 0x000001
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# define PT0 T0 &
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# else
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# define PT0 T0 const &
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# endif
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# if I & 0x000002
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# define PT1 T1 &
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# else
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# define PT1 T1 const &
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# endif
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# if I & 0x000004
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# define PT2 T2 &
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# else
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# define PT2 T2 const &
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# endif
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# if I & 0x000008
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# define PT3 T3 &
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# else
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# define PT3 T3 const &
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# endif
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# if I & 0x000010
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# define PT4 T4 &
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# else
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# define PT4 T4 const &
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# endif
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# if I & 0x000020
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# define PT5 T5 &
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# else
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# define PT5 T5 const &
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# endif
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# if I & 0x000040
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# define PT6 T6 &
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# else
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# define PT6 T6 const &
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# endif
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# if I & 0x000080
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# define PT7 T7 &
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# else
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# define PT7 T7 const &
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# endif
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# if I & 0x000100
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# define PT8 T8 &
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# else
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# define PT8 T8 const &
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# endif
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# if I & 0x000200
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# define PT9 T9 &
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# else
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# define PT9 T9 const &
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# endif
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# if I & 0x000400
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# define PT10 T10 &
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# else
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# define PT10 T10 const &
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# endif
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# if I & 0x000800
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# define PT11 T11 &
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# else
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# define PT11 T11 const &
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# endif
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# if I & 0x001000
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# define PT12 T12 &
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# else
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# define PT12 T12 const &
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# endif
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# if I & 0x002000
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# define PT13 T13 &
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# else
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# define PT13 T13 const &
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# endif
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# if I & 0x004000
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# define PT14 T14 &
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# else
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# define PT14 T14 const &
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# endif
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# if I & 0x008000
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# define PT15 T15 &
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# else
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# define PT15 T15 const &
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# endif
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# if BOOST_WORKAROUND(BOOST_MSVC,BOOST_TESTED_AT(1400))
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template< BOOST_PP_ENUM_PARAMS(N,typename T) >
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inline typename boost::result_of< FC(BOOST_PP_ENUM_PARAMS(N,PT))
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>::type
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operator()(BOOST_PP_ENUM_BINARY_PARAMS(N,PT,a)) const
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{
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return static_cast<MD const* const>(this)
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->target_function()(BOOST_PP_ENUM_PARAMS(N,a));
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}
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template< BOOST_PP_ENUM_PARAMS(N,typename T) >
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inline typename boost::result_of< F(BOOST_PP_ENUM_PARAMS(N,PT))
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>::type
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operator()(BOOST_PP_ENUM_BINARY_PARAMS(N,PT,a))
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{
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return static_cast<MD* const>(this)
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->target_function()(BOOST_PP_ENUM_PARAMS(N,a));
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}
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# else
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BOOST_TMP_MACRO(BOOST_PP_ENUM_PARAMS(N,typename T),
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BOOST_PP_ENUM_PARAMS(N,PT), BOOST_PP_ENUM_BINARY_PARAMS(N,PT,a),
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BOOST_PP_ENUM_PARAMS(N,a) )
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// ...generates uglier code but is faster - it caches ENUM_*
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# endif
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# undef PT0
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# undef PT1
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# undef PT2
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# undef PT3
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# undef PT4
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# undef PT5
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# undef PT6
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# undef PT7
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# undef PT8
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# undef PT9
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# undef PT10
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# undef PT11
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# undef PT12
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# undef PT13
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# undef PT14
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# undef PT15
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# endif // I < count
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# undef I
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# endif // defined(BOOST_PP_IS_ITERATING)
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#endif // include guard
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