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270 lines
8.4 KiB
270 lines
8.4 KiB
#if !defined(BOOST_PP_IS_ITERATING) |
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// Copyright David Abrahams 2002. |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// 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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# ifndef CALLER_DWA20021121_HPP |
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# define CALLER_DWA20021121_HPP |
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# include <boost/python/type_id.hpp> |
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# include <boost/python/handle.hpp> |
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# include <boost/detail/indirect_traits.hpp> |
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# include <boost/python/detail/invoke.hpp> |
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# include <boost/python/detail/signature.hpp> |
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# include <boost/python/detail/preprocessor.hpp> |
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# include <boost/python/detail/type_traits.hpp> |
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# include <boost/python/arg_from_python.hpp> |
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# include <boost/python/converter/context_result_converter.hpp> |
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# include <boost/python/converter/builtin_converters.hpp> |
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# include <boost/preprocessor/iterate.hpp> |
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# include <boost/preprocessor/cat.hpp> |
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# include <boost/preprocessor/dec.hpp> |
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# include <boost/preprocessor/if.hpp> |
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# include <boost/preprocessor/iteration/local.hpp> |
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# include <boost/preprocessor/repetition/enum_trailing_params.hpp> |
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# include <boost/preprocessor/repetition/repeat.hpp> |
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# include <boost/compressed_pair.hpp> |
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# include <boost/mpl/apply.hpp> |
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# include <boost/mpl/eval_if.hpp> |
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# include <boost/mpl/identity.hpp> |
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# include <boost/mpl/size.hpp> |
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# include <boost/mpl/at.hpp> |
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# include <boost/mpl/int.hpp> |
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# include <boost/mpl/next.hpp> |
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namespace boost { namespace python { namespace detail { |
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template <int N> |
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inline PyObject* get(mpl::int_<N>, PyObject* const& args_) |
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{ |
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return PyTuple_GET_ITEM(args_,N); |
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} |
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inline Py_ssize_t arity(PyObject* const& args_) |
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{ |
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return PyTuple_GET_SIZE(args_); |
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} |
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// This "result converter" is really just used as |
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// a dispatch tag to invoke(...), selecting the appropriate |
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// implementation |
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typedef int void_result_to_python; |
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// Given a model of CallPolicies and a C++ result type, this |
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// metafunction selects the appropriate converter to use for |
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// converting the result to python. |
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template <class Policies, class Result> |
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struct select_result_converter |
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: mpl::eval_if< |
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is_same<Result,void> |
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, mpl::identity<void_result_to_python> |
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, mpl::apply1<typename Policies::result_converter,Result> |
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> |
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{ |
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}; |
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template <class ArgPackage, class ResultConverter> |
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inline ResultConverter create_result_converter( |
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ArgPackage const& args_ |
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, ResultConverter* |
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, converter::context_result_converter* |
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) |
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{ |
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return ResultConverter(args_); |
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} |
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template <class ArgPackage, class ResultConverter> |
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inline ResultConverter create_result_converter( |
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ArgPackage const& |
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, ResultConverter* |
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, ... |
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) |
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{ |
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return ResultConverter(); |
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} |
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#ifndef BOOST_PYTHON_NO_PY_SIGNATURES |
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template <class ResultConverter> |
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struct converter_target_type |
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{ |
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static PyTypeObject const *get_pytype() |
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{ |
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return create_result_converter((PyObject*)0, (ResultConverter *)0, (ResultConverter *)0).get_pytype(); |
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} |
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}; |
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template < > |
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struct converter_target_type <void_result_to_python > |
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{ |
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static PyTypeObject const *get_pytype() |
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{ |
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return 0; |
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} |
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}; |
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// Generation of ret moved from caller_arity<N>::impl::signature to here due to "feature" in MSVC 15.7.2 with /O2 |
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// which left the ret uninitialized and caused segfaults in Python interpreter. |
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template<class Policies, class Sig> const signature_element* get_ret() |
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{ |
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typedef BOOST_DEDUCED_TYPENAME Policies::template extract_return_type<Sig>::type rtype; |
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typedef typename select_result_converter<Policies, rtype>::type result_converter; |
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static const signature_element ret = { |
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(is_void<rtype>::value ? "void" : type_id<rtype>().name()) |
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, &detail::converter_target_type<result_converter>::get_pytype |
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, boost::detail::indirect_traits::is_reference_to_non_const<rtype>::value |
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}; |
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return &ret; |
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}; |
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#endif |
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template <unsigned> struct caller_arity; |
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template <class F, class CallPolicies, class Sig> |
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struct caller; |
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# define BOOST_PYTHON_NEXT(init,name,n) \ |
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typedef BOOST_PP_IF(n,typename mpl::next< BOOST_PP_CAT(name,BOOST_PP_DEC(n)) >::type, init) name##n; |
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# define BOOST_PYTHON_ARG_CONVERTER(n) \ |
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BOOST_PYTHON_NEXT(typename mpl::next<first>::type, arg_iter,n) \ |
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typedef arg_from_python<BOOST_DEDUCED_TYPENAME arg_iter##n::type> c_t##n; \ |
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c_t##n c##n(get(mpl::int_<n>(), inner_args)); \ |
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if (!c##n.convertible()) \ |
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return 0; |
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# define BOOST_PP_ITERATION_PARAMS_1 \ |
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(3, (0, BOOST_PYTHON_MAX_ARITY + 1, <boost/python/detail/caller.hpp>)) |
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# include BOOST_PP_ITERATE() |
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# undef BOOST_PYTHON_ARG_CONVERTER |
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# undef BOOST_PYTHON_NEXT |
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// A metafunction returning the base class used for caller<class F, |
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// class ConverterGenerators, class CallPolicies, class Sig>. |
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template <class F, class CallPolicies, class Sig> |
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struct caller_base_select |
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{ |
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enum { arity = mpl::size<Sig>::value - 1 }; |
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typedef typename caller_arity<arity>::template impl<F,CallPolicies,Sig> type; |
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}; |
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// A function object type which wraps C++ objects as Python callable |
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// objects. |
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// |
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// Template Arguments: |
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// |
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// F - |
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// the C++ `function object' that will be called. Might |
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// actually be any data for which an appropriate invoke_tag() can |
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// be generated. invoke(...) takes care of the actual invocation syntax. |
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// |
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// CallPolicies - |
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// The precall, postcall, and what kind of resultconverter to |
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// generate for mpl::front<Sig>::type |
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// |
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// Sig - |
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// The `intended signature' of the function. An MPL sequence |
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// beginning with a result type and continuing with a list of |
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// argument types. |
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template <class F, class CallPolicies, class Sig> |
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struct caller |
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: caller_base_select<F,CallPolicies,Sig>::type |
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{ |
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typedef typename caller_base_select< |
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F,CallPolicies,Sig |
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>::type base; |
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typedef PyObject* result_type; |
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caller(F f, CallPolicies p) : base(f,p) {} |
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}; |
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}}} // namespace boost::python::detail |
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# endif // CALLER_DWA20021121_HPP |
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#else |
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# define N BOOST_PP_ITERATION() |
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template <> |
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struct caller_arity<N> |
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{ |
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template <class F, class Policies, class Sig> |
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struct impl |
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{ |
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impl(F f, Policies p) : m_data(f,p) {} |
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PyObject* operator()(PyObject* args_, PyObject*) // eliminate |
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// this |
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// trailing |
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// keyword dict |
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{ |
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typedef typename mpl::begin<Sig>::type first; |
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typedef typename first::type result_t; |
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typedef typename select_result_converter<Policies, result_t>::type result_converter; |
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typedef typename Policies::argument_package argument_package; |
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argument_package inner_args(args_); |
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# if N |
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# define BOOST_PP_LOCAL_MACRO(i) BOOST_PYTHON_ARG_CONVERTER(i) |
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# define BOOST_PP_LOCAL_LIMITS (0, N-1) |
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# include BOOST_PP_LOCAL_ITERATE() |
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# endif |
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// all converters have been checked. Now we can do the |
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// precall part of the policy |
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if (!m_data.second().precall(inner_args)) |
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return 0; |
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PyObject* result = detail::invoke( |
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detail::invoke_tag<result_t,F>() |
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, create_result_converter(args_, (result_converter*)0, (result_converter*)0) |
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, m_data.first() |
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BOOST_PP_ENUM_TRAILING_PARAMS(N, c) |
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); |
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return m_data.second().postcall(inner_args, result); |
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} |
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static unsigned min_arity() { return N; } |
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static py_func_sig_info signature() |
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{ |
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const signature_element * sig = detail::signature<Sig>::elements(); |
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#ifndef BOOST_PYTHON_NO_PY_SIGNATURES |
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// MSVC 15.7.2, when compiling to /O2 left the static const signature_element ret, |
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// originally defined here, uninitialized. This in turn led to SegFault in Python interpreter. |
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// Issue is resolved by moving the generation of ret to separate function in detail namespace (see above). |
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const signature_element * ret = detail::get_ret<Policies, Sig>(); |
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py_func_sig_info res = {sig, ret }; |
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#else |
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py_func_sig_info res = {sig, sig }; |
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#endif |
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return res; |
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} |
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private: |
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compressed_pair<F,Policies> m_data; |
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}; |
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}; |
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#endif // BOOST_PP_IS_ITERATING |
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