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292 lines
9.2 KiB
C++
292 lines
9.2 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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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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#if !defined(BOOST_PP_IS_ITERATING)
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#ifndef DEFAULTS_DEF_JDG20020811_HPP
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#define DEFAULTS_DEF_JDG20020811_HPP
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#include <boost/python/detail/defaults_gen.hpp>
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#include <boost/type_traits.hpp>
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#include <boost/mpl/front.hpp>
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#include <boost/mpl/size.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/preprocessor/iterate.hpp>
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#include <boost/python/class_fwd.hpp>
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#include <boost/python/scope.hpp>
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#include <boost/preprocessor/debug/line.hpp>
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#include <boost/python/detail/scope.hpp>
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#include <boost/python/detail/make_keyword_range_fn.hpp>
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#include <boost/python/object/add_to_namespace.hpp>
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///////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace python {
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struct module;
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namespace objects
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{
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struct class_base;
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}
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namespace detail
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{
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// Called as::
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//
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// name_space_def(ns, "func", func, kw, policies, docstring, &ns)
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//
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// Dispatch to properly add f to namespace ns.
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//
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// @group define_stub_function helpers {
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template <class Func, class CallPolicies, class NameSpaceT>
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static void name_space_def(
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NameSpaceT& name_space
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, char const* name
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, Func f
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, keyword_range const& kw
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, CallPolicies const& policies
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, char const* doc
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, objects::class_base*
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)
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{
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typedef typename NameSpaceT::wrapped_type wrapped_type;
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objects::add_to_namespace(
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name_space, name,
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detail::make_keyword_range_function(
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f, policies, kw, get_signature(f, (wrapped_type*)0))
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, doc
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);
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}
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template <class Func, class CallPolicies>
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static void name_space_def(
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object& name_space
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, char const* name
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, Func f
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, keyword_range const& kw
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, CallPolicies const& policies
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, char const* doc
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, ...
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)
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{
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scope within(name_space);
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detail::scope_setattr_doc(
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name
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, detail::make_keyword_range_function(f, policies, kw)
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, doc);
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}
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// For backward compatibility -- is this obsolete?
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template <class Func, class CallPolicies, class NameSpaceT>
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static void name_space_def(
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NameSpaceT& name_space
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, char const* name
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, Func f
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, keyword_range const& kw // ignored
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, CallPolicies const& policies
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, char const* doc
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, module*
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)
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{
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name_space.def(name, f, policies, doc);
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}
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// }
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// Expansions of ::
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//
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// template <typename OverloadsT, typename NameSpaceT>
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// inline void
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// define_stub_function(
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// char const* name, OverloadsT s, NameSpaceT& name_space, mpl::int_<N>)
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// {
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// name_space.def(name, &OverloadsT::func_N);
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// }
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//
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// where N runs from 0 to BOOST_PYTHON_MAX_ARITY.
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//
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// The set of overloaded functions (define_stub_function) expects:
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//
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// 1. char const* name: function name that will be visible to python
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// 2. OverloadsT: a function overloads struct (see defaults_gen.hpp)
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// 3. NameSpaceT& name_space: a python::class_ or python::module instance
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// 4. int_t<N>: the Nth overloaded function (OverloadsT::func_N)
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// (see defaults_gen.hpp)
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// 5. char const* name: doc string
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//
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// @group define_stub_function<N> {
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template <int N>
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struct define_stub_function {};
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#define BOOST_PP_ITERATION_PARAMS_1 \
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(3, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/detail/defaults_def.hpp>))
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#include BOOST_PP_ITERATE()
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// }
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// This helper template struct does the actual recursive
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// definition. There's a generic version
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// define_with_defaults_helper<N> and a terminal case
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// define_with_defaults_helper<0>. The struct and its
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// specialization has a sole static member function def that
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// expects:
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//
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// 1. char const* name: function name that will be
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// visible to python
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//
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// 2. OverloadsT: a function overloads struct
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// (see defaults_gen.hpp)
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//
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// 3. NameSpaceT& name_space: a python::class_ or
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// python::module instance
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//
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// 4. char const* name: doc string
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//
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// The def static member function calls a corresponding
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// define_stub_function<N>. The general case recursively calls
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// define_with_defaults_helper<N-1>::def until it reaches the
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// terminal case case define_with_defaults_helper<0>.
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template <int N>
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struct define_with_defaults_helper {
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template <class StubsT, class CallPolicies, class NameSpaceT>
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static void
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def(
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char const* name,
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StubsT stubs,
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keyword_range kw,
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CallPolicies const& policies,
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NameSpaceT& name_space,
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char const* doc)
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{
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// define the NTH stub function of stubs
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define_stub_function<N>::define(name, stubs, kw, policies, name_space, doc);
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if (kw.second > kw.first)
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--kw.second;
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// call the next define_with_defaults_helper
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define_with_defaults_helper<N-1>::def(name, stubs, kw, policies, name_space, doc);
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}
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};
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template <>
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struct define_with_defaults_helper<0> {
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template <class StubsT, class CallPolicies, class NameSpaceT>
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static void
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def(
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char const* name,
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StubsT stubs,
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keyword_range const& kw,
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CallPolicies const& policies,
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NameSpaceT& name_space,
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char const* doc)
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{
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// define the Oth stub function of stubs
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define_stub_function<0>::define(name, stubs, kw, policies, name_space, doc);
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// return
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}
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};
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// define_with_defaults
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//
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// 1. char const* name: function name that will be
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// visible to python
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//
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// 2. OverloadsT: a function overloads struct
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// (see defaults_gen.hpp)
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//
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// 3. CallPolicies& policies: Call policies
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// 4. NameSpaceT& name_space: a python::class_ or
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// python::module instance
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//
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// 5. SigT sig: Function signature typelist
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// (see defaults_gen.hpp)
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//
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// 6. char const* name: doc string
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//
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// This is the main entry point. This function recursively
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// defines all stub functions of StubT (see defaults_gen.hpp) in
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// NameSpaceT name_space which can be either a python::class_ or
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// a python::module. The sig argument is a typelist that
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// specifies the return type, the class (for member functions,
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// and the arguments. Here are some SigT examples:
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//
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// int foo(int) mpl::vector<int, int>
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// void bar(int, int) mpl::vector<void, int, int>
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// void C::foo(int) mpl::vector<void, C, int>
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//
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template <class OverloadsT, class NameSpaceT, class SigT>
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inline void
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define_with_defaults(
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char const* name,
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OverloadsT const& overloads,
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NameSpaceT& name_space,
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SigT const&)
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{
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typedef typename mpl::front<SigT>::type return_type;
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typedef typename OverloadsT::void_return_type void_return_type;
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typedef typename OverloadsT::non_void_return_type non_void_return_type;
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typedef typename mpl::if_c<
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boost::is_same<void, return_type>::value
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, void_return_type
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, non_void_return_type
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>::type stubs_type;
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BOOST_STATIC_ASSERT(
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(stubs_type::max_args) <= mpl::size<SigT>::value);
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typedef typename stubs_type::template gen<SigT> gen_type;
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define_with_defaults_helper<stubs_type::n_funcs-1>::def(
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name
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, gen_type()
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, overloads.keywords()
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, overloads.call_policies()
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, name_space
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, overloads.doc_string());
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}
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} // namespace detail
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}} // namespace boost::python
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#endif // DEFAULTS_DEF_JDG20020811_HPP
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#else // defined(BOOST_PP_IS_ITERATING)
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// PP vertical iteration code
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template <>
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struct define_stub_function<BOOST_PP_ITERATION()> {
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template <class StubsT, class CallPolicies, class NameSpaceT>
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static void define(
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char const* name
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, StubsT const&
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, keyword_range const& kw
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, CallPolicies const& policies
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, NameSpaceT& name_space
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, char const* doc)
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{
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detail::name_space_def(
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name_space
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, name
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, &StubsT::BOOST_PP_CAT(func_, BOOST_PP_ITERATION())
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, kw
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, policies
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, doc
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, &name_space);
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}
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};
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#endif // !defined(BOOST_PP_IS_ITERATING)
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