389 lines
20 KiB
Plaintext
389 lines
20 KiB
Plaintext
///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright David Abrahams 2002, Joel de Guzman, 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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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef DEFAULTS_GEN_JDG20020807_HPP
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#define DEFAULTS_GEN_JDG20020807_HPP
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#include <boost/python/detail/preprocessor.hpp>
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#include <boost/preprocessor/repeat.hpp>
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#include <boost/preprocessor/repeat_from_to.hpp>
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#include <boost/preprocessor/enum.hpp>
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#include <boost/preprocessor/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_binary_params.hpp>
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#include <boost/preprocessor/tuple.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/arithmetic/sub.hpp>
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#include <boost/preprocessor/stringize.hpp>
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#include <boost/preprocessor/inc.hpp>
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#include <boost/preprocessor/empty.hpp>
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#include <boost/preprocessor/comma_if.hpp>
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#include <boost/config.hpp>
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#include <boost/mpl/begin_end.hpp>
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#include <boost/mpl/next.hpp>
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#include <boost/mpl/deref.hpp>
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#include <cstddef>
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namespace boost { namespace python {
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namespace detail
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{
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// overloads_base is used as a base class for all function
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// stubs. This class holds the doc_string of the stubs.
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struct overloads_base
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{
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overloads_base(char const* doc_)
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: m_doc(doc_) {}
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overloads_base(char const* doc_, detail::keyword_range const& kw)
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: m_doc(doc_), m_keywords(kw) {}
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char const* doc_string() const
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{
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return m_doc;
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}
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detail::keyword_range const& keywords() const
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{
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return m_keywords;
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}
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private:
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char const* m_doc;
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detail::keyword_range m_keywords;
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};
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// overloads_proxy is generated by the overloads_common operator[] (see
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// below). This class holds a user defined call policies of the stubs.
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template <class CallPoliciesT, class OverloadsT>
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struct overloads_proxy
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: public overloads_base
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{
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typedef typename OverloadsT::non_void_return_type non_void_return_type;
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typedef typename OverloadsT::void_return_type void_return_type;
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overloads_proxy(
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CallPoliciesT const& policies_
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, char const* doc
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, keyword_range const& kw
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)
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: overloads_base(doc, kw)
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, policies(policies_)
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{}
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CallPoliciesT
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call_policies() const
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{
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return policies;
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}
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CallPoliciesT policies;
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};
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// overloads_common is our default function stubs base class. This
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// class returns the default_call_policies in its call_policies()
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// member function. It can generate a overloads_proxy however through
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// its operator[]
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template <class DerivedT>
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struct overloads_common
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: public overloads_base
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{
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overloads_common(char const* doc)
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: overloads_base(doc) {}
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overloads_common(char const* doc, keyword_range const& kw)
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: overloads_base(doc, kw) {}
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default_call_policies
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call_policies() const
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{
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return default_call_policies();
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}
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template <class CallPoliciesT>
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overloads_proxy<CallPoliciesT, DerivedT>
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operator[](CallPoliciesT const& policies) const
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{
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return overloads_proxy<CallPoliciesT, DerivedT>(
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policies, this->doc_string(), this->keywords());
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}
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};
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}}} // namespace boost::python::detail
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#define BOOST_PYTHON_TYPEDEF_GEN(z, index, data) \
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typedef typename ::boost::mpl::next<BOOST_PP_CAT(iter, index)>::type \
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BOOST_PP_CAT(iter, BOOST_PP_INC(index)); \
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typedef typename ::boost::mpl::deref<BOOST_PP_CAT(iter, index)>::type \
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BOOST_PP_CAT(T, index);
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#define BOOST_PYTHON_FUNC_WRAPPER_GEN(z, index, data) \
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static RT BOOST_PP_CAT(func_, \
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BOOST_PP_SUB_D(1, index, BOOST_PP_TUPLE_ELEM(3, 1, data))) ( \
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BOOST_PP_ENUM_BINARY_PARAMS_Z( \
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1, index, T, arg)) \
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{ \
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BOOST_PP_TUPLE_ELEM(3, 2, data) \
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BOOST_PP_TUPLE_ELEM(3, 0, data)( \
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BOOST_PP_ENUM_PARAMS( \
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index, \
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arg)); \
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}
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#define BOOST_PYTHON_GEN_FUNCTION(fname, fstubs_name, n_args, n_dflts, ret) \
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struct fstubs_name \
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{ \
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BOOST_STATIC_CONSTANT(int, n_funcs = BOOST_PP_INC(n_dflts)); \
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BOOST_STATIC_CONSTANT(int, max_args = n_funcs); \
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\
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template <typename SigT> \
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struct gen \
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{ \
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typedef typename ::boost::mpl::begin<SigT>::type rt_iter; \
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typedef typename ::boost::mpl::deref<rt_iter>::type RT; \
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typedef typename ::boost::mpl::next<rt_iter>::type iter0; \
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\
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BOOST_PP_REPEAT_2ND( \
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n_args, \
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BOOST_PYTHON_TYPEDEF_GEN, \
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0) \
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\
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BOOST_PP_REPEAT_FROM_TO_2( \
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BOOST_PP_SUB_D(1, n_args, n_dflts), \
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BOOST_PP_INC(n_args), \
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BOOST_PYTHON_FUNC_WRAPPER_GEN, \
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(fname, BOOST_PP_SUB_D(1, n_args, n_dflts), ret)) \
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}; \
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}; \
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///////////////////////////////////////////////////////////////////////////////
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#define BOOST_PYTHON_MEM_FUNC_WRAPPER_GEN(z, index, data) \
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static RT BOOST_PP_CAT(func_, \
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BOOST_PP_SUB_D(1, index, BOOST_PP_TUPLE_ELEM(3, 1, data))) ( \
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ClassT obj BOOST_PP_COMMA_IF(index) \
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BOOST_PP_ENUM_BINARY_PARAMS_Z(1, index, T, arg) \
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) \
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{ \
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BOOST_PP_TUPLE_ELEM(3, 2, data) obj.BOOST_PP_TUPLE_ELEM(3, 0, data)( \
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BOOST_PP_ENUM_PARAMS(index, arg) \
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); \
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}
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#define BOOST_PYTHON_GEN_MEM_FUNCTION(fname, fstubs_name, n_args, n_dflts, ret) \
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struct fstubs_name \
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{ \
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BOOST_STATIC_CONSTANT(int, n_funcs = BOOST_PP_INC(n_dflts)); \
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BOOST_STATIC_CONSTANT(int, max_args = n_funcs + 1); \
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\
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template <typename SigT> \
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struct gen \
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{ \
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typedef typename ::boost::mpl::begin<SigT>::type rt_iter; \
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typedef typename ::boost::mpl::deref<rt_iter>::type RT; \
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\
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typedef typename ::boost::mpl::next<rt_iter>::type class_iter; \
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typedef typename ::boost::mpl::deref<class_iter>::type ClassT; \
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typedef typename ::boost::mpl::next<class_iter>::type iter0; \
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\
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BOOST_PP_REPEAT_2ND( \
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n_args, \
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BOOST_PYTHON_TYPEDEF_GEN, \
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0) \
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\
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BOOST_PP_REPEAT_FROM_TO_2( \
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BOOST_PP_SUB_D(1, n_args, n_dflts), \
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BOOST_PP_INC(n_args), \
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BOOST_PYTHON_MEM_FUNC_WRAPPER_GEN, \
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(fname, BOOST_PP_SUB_D(1, n_args, n_dflts), ret)) \
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}; \
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};
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#define BOOST_PYTHON_OVERLOAD_CONSTRUCTORS(fstubs_name, n_args, n_dflts) \
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fstubs_name(char const* doc = 0) \
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: ::boost::python::detail::overloads_common<fstubs_name>(doc) {} \
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template <std::size_t N> \
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fstubs_name(char const* doc, ::boost::python::detail::keywords<N> const& keywords) \
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: ::boost::python::detail::overloads_common<fstubs_name>( \
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doc, keywords.range()) \
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{ \
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typedef typename ::boost::python::detail:: \
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error::more_keywords_than_function_arguments< \
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N,n_args>::too_many_keywords assertion BOOST_ATTRIBUTE_UNUSED; \
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} \
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template <std::size_t N> \
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fstubs_name(::boost::python::detail::keywords<N> const& keywords, char const* doc = 0) \
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: ::boost::python::detail::overloads_common<fstubs_name>( \
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doc, keywords.range()) \
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{ \
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typedef typename ::boost::python::detail:: \
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error::more_keywords_than_function_arguments< \
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N,n_args>::too_many_keywords assertion BOOST_ATTRIBUTE_UNUSED; \
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}
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# if defined(BOOST_NO_VOID_RETURNS)
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# define BOOST_PYTHON_GEN_FUNCTION_STUB(fname, fstubs_name, n_args, n_dflts) \
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struct fstubs_name \
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: public ::boost::python::detail::overloads_common<fstubs_name> \
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{ \
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BOOST_PYTHON_GEN_FUNCTION( \
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fname, non_void_return_type, n_args, n_dflts, return) \
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BOOST_PYTHON_GEN_FUNCTION( \
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fname, void_return_type, n_args, n_dflts, ;) \
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\
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BOOST_PYTHON_OVERLOAD_CONSTRUCTORS(fstubs_name, n_args, n_dflts) \
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};
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# define BOOST_PYTHON_GEN_MEM_FUNCTION_STUB(fname, fstubs_name, n_args, n_dflts) \
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struct fstubs_name \
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: public ::boost::python::detail::overloads_common<fstubs_name> \
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{ \
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BOOST_PYTHON_GEN_MEM_FUNCTION( \
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fname, non_void_return_type, n_args, n_dflts, return) \
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BOOST_PYTHON_GEN_MEM_FUNCTION( \
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fname, void_return_type, n_args, n_dflts, ;) \
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\
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BOOST_PYTHON_OVERLOAD_CONSTRUCTORS(fstubs_name, n_args + 1, n_dflts) \
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};
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# else // !defined(BOOST_NO_VOID_RETURNS)
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# define BOOST_PYTHON_GEN_FUNCTION_STUB(fname, fstubs_name, n_args, n_dflts) \
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struct fstubs_name \
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: public ::boost::python::detail::overloads_common<fstubs_name> \
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{ \
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BOOST_PYTHON_GEN_FUNCTION( \
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fname, non_void_return_type, n_args, n_dflts, return) \
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\
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typedef non_void_return_type void_return_type; \
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BOOST_PYTHON_OVERLOAD_CONSTRUCTORS(fstubs_name, n_args, n_dflts) \
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};
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# define BOOST_PYTHON_GEN_MEM_FUNCTION_STUB(fname, fstubs_name, n_args, n_dflts) \
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struct fstubs_name \
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: public ::boost::python::detail::overloads_common<fstubs_name> \
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{ \
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BOOST_PYTHON_GEN_MEM_FUNCTION( \
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fname, non_void_return_type, n_args, n_dflts, return) \
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\
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typedef non_void_return_type void_return_type; \
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BOOST_PYTHON_OVERLOAD_CONSTRUCTORS(fstubs_name, n_args + 1, n_dflts) \
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};
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# endif // !defined(BOOST_NO_VOID_RETURNS)
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///////////////////////////////////////////////////////////////////////////////
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//
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// MAIN MACROS
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//
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// Given generator_name, fname, min_args and max_args, These macros
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// generate function stubs that forward to a function or member function
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// named fname. max_args is the arity of the function or member function
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// fname. fname can have default arguments. min_args is the minimum
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// arity that fname can accept.
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//
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// There are two versions:
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//
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// 1. BOOST_PYTHON_FUNCTION_OVERLOADS for free functions
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// 2. BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS for member functions.
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//
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// For instance, given a function:
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//
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// int
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// foo(int a, char b = 1, unsigned c = 2, double d = 3)
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// {
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// return a + b + c + int(d);
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// }
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//
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// The macro invocation:
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//
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// BOOST_PYTHON_FUNCTION_OVERLOADS(foo_stubs, foo, 1, 4)
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//
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// Generates this code:
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//
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// struct foo_stubsNonVoid
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// {
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// static const int n_funcs = 4;
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// static const int max_args = n_funcs;
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//
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// template <typename SigT>
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// struct gen
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// {
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// typedef typename ::boost::mpl::begin<SigT>::type rt_iter;
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// typedef typename rt_iter::type RT;
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// typedef typename rt_iter::next iter0;
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// typedef typename iter0::type T0;
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// typedef typename iter0::next iter1;
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// typedef typename iter1::type T1;
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// typedef typename iter1::next iter2;
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// typedef typename iter2::type T2;
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// typedef typename iter2::next iter3;
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// typedef typename iter3::type T3;
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// typedef typename iter3::next iter4;
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//
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// static RT func_0(T0 arg0)
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// { return foo(arg0); }
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//
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// static RT func_1(T0 arg0, T1 arg1)
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// { return foo(arg0, arg1); }
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//
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// static RT func_2(T0 arg0, T1 arg1, T2 arg2)
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// { return foo(arg0, arg1, arg2); }
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//
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// static RT func_3(T0 arg0, T1 arg1, T2 arg2, T3 arg3)
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// { return foo(arg0, arg1, arg2, arg3); }
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// };
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// };
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//
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// struct foo_overloads
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// : public boost::python::detail::overloads_common<foo_overloads>
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// {
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// typedef foo_overloadsNonVoid non_void_return_type;
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// typedef foo_overloadsNonVoid void_return_type;
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//
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// foo_overloads(char const* doc = 0)
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// : boost::python::detail::overloads_common<foo_overloads>(doc) {}
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// };
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//
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// The typedefs non_void_return_type and void_return_type are
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// used to handle compilers that do not support void returns. The
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// example above typedefs non_void_return_type and
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// void_return_type to foo_overloadsNonVoid. On compilers that do
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// not support void returns, there are two versions:
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// foo_overloadsNonVoid and foo_overloadsVoid. The "Void"
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// version is almost identical to the "NonVoid" version except
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// for the return type (void) and the lack of the return keyword.
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//
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// See the overloads_common above for a description of the
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// foo_overloads' base class.
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//
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///////////////////////////////////////////////////////////////////////////////
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#define BOOST_PYTHON_FUNCTION_OVERLOADS(generator_name, fname, min_args, max_args) \
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BOOST_PYTHON_GEN_FUNCTION_STUB( \
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fname, \
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generator_name, \
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max_args, \
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BOOST_PP_SUB_D(1, max_args, min_args))
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#define BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS(generator_name, fname, min_args, max_args) \
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BOOST_PYTHON_GEN_MEM_FUNCTION_STUB( \
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fname, \
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generator_name, \
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max_args, \
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BOOST_PP_SUB_D(1, max_args, min_args))
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// deprecated macro names (to be removed)
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#define BOOST_PYTHON_FUNCTION_GENERATOR BOOST_PYTHON_FUNCTION_OVERLOADS
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#define BOOST_PYTHON_MEM_FUN_GENERATOR BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS
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///////////////////////////////////////////////////////////////////////////////
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#endif // DEFAULTS_GEN_JDG20020807_HPP
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