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290 lines
8.4 KiB
290 lines
8.4 KiB
// Copyright David Abrahams 2001. |
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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 MAKE_CONSTRUCTOR_DWA20011221_HPP |
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# define MAKE_CONSTRUCTOR_DWA20011221_HPP |
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# include <boost/python/detail/prefix.hpp> |
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# include <boost/python/default_call_policies.hpp> |
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# include <boost/python/args.hpp> |
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# include <boost/python/object_fwd.hpp> |
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# include <boost/python/object/function_object.hpp> |
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# include <boost/python/object/make_holder.hpp> |
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# include <boost/python/object/pointer_holder.hpp> |
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# include <boost/python/converter/context_result_converter.hpp> |
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# include <boost/python/detail/caller.hpp> |
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# include <boost/python/detail/none.hpp> |
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# include <boost/mpl/size.hpp> |
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# include <boost/mpl/int.hpp> |
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# include <boost/mpl/push_front.hpp> |
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# include <boost/mpl/pop_front.hpp> |
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# include <boost/mpl/assert.hpp> |
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namespace boost { namespace python { |
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namespace detail |
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{ |
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template <class T> |
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struct install_holder : converter::context_result_converter |
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{ |
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install_holder(PyObject* args_) |
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: m_self(PyTuple_GetItem(args_, 0)) {} |
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PyObject* operator()(T x) const |
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{ |
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dispatch(x, is_pointer<T>()); |
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return none(); |
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} |
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private: |
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template <class U> |
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void dispatch(U* x, mpl::true_) const |
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{ |
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std::auto_ptr<U> owner(x); |
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dispatch(owner, mpl::false_()); |
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} |
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template <class Ptr> |
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void dispatch(Ptr x, mpl::false_) const |
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{ |
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typedef typename pointee<Ptr>::type value_type; |
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typedef objects::pointer_holder<Ptr,value_type> holder; |
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typedef objects::instance<holder> instance_t; |
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void* memory = holder::allocate(this->m_self, offsetof(instance_t, storage), sizeof(holder)); |
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try { |
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(new (memory) holder(x))->install(this->m_self); |
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} |
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catch(...) { |
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holder::deallocate(this->m_self, memory); |
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throw; |
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} |
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} |
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PyObject* m_self; |
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}; |
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struct constructor_result_converter |
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{ |
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template <class T> |
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struct apply |
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{ |
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typedef install_holder<T> type; |
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}; |
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}; |
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template <class BaseArgs, class Offset> |
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struct offset_args |
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{ |
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offset_args(BaseArgs base_) : base(base_) {} |
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BaseArgs base; |
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}; |
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template <int N, class BaseArgs, class Offset> |
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inline PyObject* get(mpl::int_<N>, offset_args<BaseArgs,Offset> const& args_) |
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{ |
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return get(mpl::int_<(N+Offset::value)>(), args_.base); |
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} |
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template <class BaseArgs, class Offset> |
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inline unsigned arity(offset_args<BaseArgs,Offset> const& args_) |
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{ |
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return arity(args_.base) - Offset::value; |
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} |
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template <class BasePolicy_ = default_call_policies> |
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struct constructor_policy : BasePolicy_ |
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{ |
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constructor_policy(BasePolicy_ base) : BasePolicy_(base) {} |
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// If the BasePolicy_ supplied a result converter it would be |
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// ignored; issue an error if it's not the default. |
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#if defined _MSC_VER && _MSC_VER < 1300 |
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typedef is_same< |
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typename BasePolicy_::result_converter |
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, default_result_converter |
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> same_result_converter; |
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//see above for explanation |
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BOOST_STATIC_ASSERT(same_result_converter::value) ; |
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#else |
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BOOST_MPL_ASSERT_MSG( |
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(is_same< |
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typename BasePolicy_::result_converter |
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, default_result_converter |
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>::value) |
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, MAKE_CONSTRUCTOR_SUPPLIES_ITS_OWN_RESULT_CONVERTER_THAT_WOULD_OVERRIDE_YOURS |
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, (typename BasePolicy_::result_converter) |
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); |
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#endif |
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typedef constructor_result_converter result_converter; |
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typedef offset_args<typename BasePolicy_::argument_package, mpl::int_<1> > argument_package; |
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}; |
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template <class InnerSignature> |
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struct outer_constructor_signature |
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{ |
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typedef typename mpl::pop_front<InnerSignature>::type inner_args; |
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typedef typename mpl::push_front<inner_args,object>::type outer_args; |
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typedef typename mpl::push_front<outer_args,void>::type type; |
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}; |
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// ETI workaround |
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template <> |
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struct outer_constructor_signature<int> |
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{ |
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typedef int type; |
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}; |
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// |
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// These helper functions for make_constructor (below) do the raw work |
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// of constructing a Python object from some invokable entity. See |
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// <boost/python/detail/caller.hpp> for more information about how |
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// the Sig arguments is used. |
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// |
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// @group make_constructor_aux { |
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template <class F, class CallPolicies, class Sig> |
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object make_constructor_aux( |
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F f // An object that can be invoked by detail::invoke() |
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, CallPolicies const& p // CallPolicies to use in the invocation |
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, Sig const& // An MPL sequence of argument types expected by F |
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) |
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{ |
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typedef typename outer_constructor_signature<Sig>::type outer_signature; |
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typedef constructor_policy<CallPolicies> inner_policy; |
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return objects::function_object( |
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objects::py_function( |
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detail::caller<F,inner_policy,Sig>(f, inner_policy(p)) |
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, outer_signature() |
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) |
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); |
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} |
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// As above, except that it accepts argument keywords. NumKeywords |
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// is used only for a compile-time assertion to make sure the user |
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// doesn't pass more keywords than the function can accept. To |
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// disable all checking, pass mpl::int_<0> for NumKeywords. |
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template <class F, class CallPolicies, class Sig, class NumKeywords> |
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object make_constructor_aux( |
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F f |
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, CallPolicies const& p |
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, Sig const& |
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, detail::keyword_range const& kw // a [begin,end) pair of iterators over keyword names |
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, NumKeywords // An MPL integral type wrapper: the size of kw |
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) |
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{ |
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enum { arity = mpl::size<Sig>::value - 1 }; |
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typedef typename detail::error::more_keywords_than_function_arguments< |
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NumKeywords::value, arity |
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>::too_many_keywords assertion; |
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typedef typename outer_constructor_signature<Sig>::type outer_signature; |
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typedef constructor_policy<CallPolicies> inner_policy; |
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return objects::function_object( |
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objects::py_function( |
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detail::caller<F,inner_policy,Sig>(f, inner_policy(p)) |
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, outer_signature() |
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) |
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, kw |
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); |
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} |
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// } |
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// |
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// These dispatch functions are used to discriminate between the |
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// cases when the 3rd argument is keywords or when it is a |
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// signature. |
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// |
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// @group Helpers for make_constructor when called with 3 arguments. { |
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// |
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template <class F, class CallPolicies, class Keywords> |
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object make_constructor_dispatch(F f, CallPolicies const& policies, Keywords const& kw, mpl::true_) |
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{ |
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return detail::make_constructor_aux( |
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f |
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, policies |
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, detail::get_signature(f) |
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, kw.range() |
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, mpl::int_<Keywords::size>() |
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); |
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} |
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template <class F, class CallPolicies, class Signature> |
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object make_constructor_dispatch(F f, CallPolicies const& policies, Signature const& sig, mpl::false_) |
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{ |
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return detail::make_constructor_aux( |
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f |
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, policies |
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, sig |
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); |
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} |
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// } |
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} |
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// These overloaded functions wrap a function or member function |
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// pointer as a Python object, using optional CallPolicies, |
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// Keywords, and/or Signature. @group { |
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// |
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template <class F> |
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object make_constructor(F f) |
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{ |
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return detail::make_constructor_aux( |
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f,default_call_policies(), detail::get_signature(f)); |
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} |
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template <class F, class CallPolicies> |
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object make_constructor(F f, CallPolicies const& policies) |
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{ |
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return detail::make_constructor_aux( |
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f, policies, detail::get_signature(f)); |
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} |
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template <class F, class CallPolicies, class KeywordsOrSignature> |
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object make_constructor( |
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F f |
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, CallPolicies const& policies |
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, KeywordsOrSignature const& keywords_or_signature) |
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{ |
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typedef typename |
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detail::is_reference_to_keywords<KeywordsOrSignature&>::type |
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is_kw; |
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return detail::make_constructor_dispatch( |
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f |
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, policies |
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, keywords_or_signature |
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, is_kw() |
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); |
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} |
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template <class F, class CallPolicies, class Keywords, class Signature> |
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object make_constructor( |
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F f |
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, CallPolicies const& policies |
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, Keywords const& kw |
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, Signature const& sig |
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) |
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{ |
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return detail::make_constructor_aux( |
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f |
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, policies |
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, sig |
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, kw.range() |
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, mpl::int_<Keywords::size>() |
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); |
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} |
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// } |
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}} |
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#endif // MAKE_CONSTRUCTOR_DWA20011221_HPP
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