291 lines
8.4 KiB
C++
291 lines
8.4 KiB
C++
// 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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