291 lines
8.6 KiB
Plaintext
291 lines
8.6 KiB
Plaintext
// Copyright David Abrahams 2001.
|
|
// Distributed under the Boost Software License, Version 1.0. (See
|
|
// accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
|
#ifndef MAKE_CONSTRUCTOR_DWA20011221_HPP
|
|
# define MAKE_CONSTRUCTOR_DWA20011221_HPP
|
|
|
|
# include <boost/python/detail/prefix.hpp>
|
|
|
|
# include <boost/python/default_call_policies.hpp>
|
|
# include <boost/python/args.hpp>
|
|
# include <boost/python/object_fwd.hpp>
|
|
|
|
# include <boost/python/object/function_object.hpp>
|
|
# include <boost/python/object/make_holder.hpp>
|
|
# include <boost/python/object/pointer_holder.hpp>
|
|
# include <boost/python/converter/context_result_converter.hpp>
|
|
|
|
# include <boost/python/detail/caller.hpp>
|
|
# include <boost/python/detail/none.hpp>
|
|
|
|
# include <boost/mpl/size.hpp>
|
|
# include <boost/mpl/int.hpp>
|
|
# include <boost/mpl/push_front.hpp>
|
|
# include <boost/mpl/pop_front.hpp>
|
|
# include <boost/mpl/assert.hpp>
|
|
|
|
namespace boost { namespace python {
|
|
|
|
namespace detail
|
|
{
|
|
template <class T>
|
|
struct install_holder : converter::context_result_converter
|
|
{
|
|
install_holder(PyObject* args_)
|
|
: m_self(PyTuple_GetItem(args_, 0)) {}
|
|
|
|
PyObject* operator()(T x) const
|
|
{
|
|
dispatch(x, is_pointer<T>());
|
|
return none();
|
|
}
|
|
|
|
private:
|
|
template <class U>
|
|
void dispatch(U* x, mpl::true_) const
|
|
{
|
|
#if __cplusplus < 201103L
|
|
std::auto_ptr<U> owner(x);
|
|
dispatch(owner, mpl::false_());
|
|
#else
|
|
std::unique_ptr<U> owner(x);
|
|
dispatch(std::move(owner), mpl::false_());
|
|
#endif
|
|
}
|
|
|
|
template <class Ptr>
|
|
void dispatch(Ptr x, mpl::false_) const
|
|
{
|
|
typedef typename pointee<Ptr>::type value_type;
|
|
typedef objects::pointer_holder<Ptr,value_type> holder;
|
|
typedef objects::instance<holder> instance_t;
|
|
|
|
void* memory = holder::allocate(this->m_self, offsetof(instance_t, storage), sizeof(holder));
|
|
try {
|
|
#if __cplusplus < 201103L
|
|
(new (memory) holder(x))->install(this->m_self);
|
|
#else
|
|
(new (memory) holder(std::move(x)))->install(this->m_self);
|
|
#endif
|
|
}
|
|
catch(...) {
|
|
holder::deallocate(this->m_self, memory);
|
|
throw;
|
|
}
|
|
}
|
|
|
|
PyObject* m_self;
|
|
};
|
|
|
|
struct constructor_result_converter
|
|
{
|
|
template <class T>
|
|
struct apply
|
|
{
|
|
typedef install_holder<T> type;
|
|
};
|
|
};
|
|
|
|
template <class BaseArgs, class Offset>
|
|
struct offset_args
|
|
{
|
|
offset_args(BaseArgs base_) : base(base_) {}
|
|
BaseArgs base;
|
|
};
|
|
|
|
template <int N, class BaseArgs, class Offset>
|
|
inline PyObject* get(mpl::int_<N>, offset_args<BaseArgs,Offset> const& args_)
|
|
{
|
|
return get(mpl::int_<(N+Offset::value)>(), args_.base);
|
|
}
|
|
|
|
template <class BaseArgs, class Offset>
|
|
inline unsigned arity(offset_args<BaseArgs,Offset> const& args_)
|
|
{
|
|
return arity(args_.base) - Offset::value;
|
|
}
|
|
|
|
template <class BasePolicy_ = default_call_policies>
|
|
struct constructor_policy : BasePolicy_
|
|
{
|
|
constructor_policy(BasePolicy_ base) : BasePolicy_(base) {}
|
|
|
|
// If the BasePolicy_ supplied a result converter it would be
|
|
// ignored; issue an error if it's not the default.
|
|
BOOST_MPL_ASSERT_MSG(
|
|
(is_same<
|
|
typename BasePolicy_::result_converter
|
|
, default_result_converter
|
|
>::value)
|
|
, MAKE_CONSTRUCTOR_SUPPLIES_ITS_OWN_RESULT_CONVERTER_THAT_WOULD_OVERRIDE_YOURS
|
|
, (typename BasePolicy_::result_converter)
|
|
);
|
|
typedef constructor_result_converter result_converter;
|
|
typedef offset_args<typename BasePolicy_::argument_package, mpl::int_<1> > argument_package;
|
|
};
|
|
|
|
template <class InnerSignature>
|
|
struct outer_constructor_signature
|
|
{
|
|
typedef typename mpl::pop_front<InnerSignature>::type inner_args;
|
|
typedef typename mpl::push_front<inner_args,object>::type outer_args;
|
|
typedef typename mpl::push_front<outer_args,void>::type type;
|
|
};
|
|
|
|
// ETI workaround
|
|
template <>
|
|
struct outer_constructor_signature<int>
|
|
{
|
|
typedef int type;
|
|
};
|
|
|
|
//
|
|
// These helper functions for make_constructor (below) do the raw work
|
|
// of constructing a Python object from some invokable entity. See
|
|
// <boost/python/detail/caller.hpp> for more information about how
|
|
// the Sig arguments is used.
|
|
//
|
|
// @group make_constructor_aux {
|
|
template <class F, class CallPolicies, class Sig>
|
|
object make_constructor_aux(
|
|
F f // An object that can be invoked by detail::invoke()
|
|
, CallPolicies const& p // CallPolicies to use in the invocation
|
|
, Sig const& // An MPL sequence of argument types expected by F
|
|
)
|
|
{
|
|
typedef typename outer_constructor_signature<Sig>::type outer_signature;
|
|
|
|
typedef constructor_policy<CallPolicies> inner_policy;
|
|
|
|
return objects::function_object(
|
|
objects::py_function(
|
|
detail::caller<F,inner_policy,Sig>(f, inner_policy(p))
|
|
, outer_signature()
|
|
)
|
|
);
|
|
}
|
|
|
|
// As above, except that it accepts argument keywords. NumKeywords
|
|
// is used only for a compile-time assertion to make sure the user
|
|
// doesn't pass more keywords than the function can accept. To
|
|
// disable all checking, pass mpl::int_<0> for NumKeywords.
|
|
template <class F, class CallPolicies, class Sig, class NumKeywords>
|
|
object make_constructor_aux(
|
|
F f
|
|
, CallPolicies const& p
|
|
, Sig const&
|
|
, detail::keyword_range const& kw // a [begin,end) pair of iterators over keyword names
|
|
, NumKeywords // An MPL integral type wrapper: the size of kw
|
|
)
|
|
{
|
|
enum { arity = mpl::size<Sig>::value - 1 };
|
|
|
|
typedef typename detail::error::more_keywords_than_function_arguments<
|
|
NumKeywords::value, arity
|
|
>::too_many_keywords assertion BOOST_ATTRIBUTE_UNUSED;
|
|
|
|
typedef typename outer_constructor_signature<Sig>::type outer_signature;
|
|
|
|
typedef constructor_policy<CallPolicies> inner_policy;
|
|
|
|
return objects::function_object(
|
|
objects::py_function(
|
|
detail::caller<F,inner_policy,Sig>(f, inner_policy(p))
|
|
, outer_signature()
|
|
)
|
|
, kw
|
|
);
|
|
}
|
|
// }
|
|
|
|
//
|
|
// These dispatch functions are used to discriminate between the
|
|
// cases when the 3rd argument is keywords or when it is a
|
|
// signature.
|
|
//
|
|
// @group Helpers for make_constructor when called with 3 arguments. {
|
|
//
|
|
template <class F, class CallPolicies, class Keywords>
|
|
object make_constructor_dispatch(F f, CallPolicies const& policies, Keywords const& kw, mpl::true_)
|
|
{
|
|
return detail::make_constructor_aux(
|
|
f
|
|
, policies
|
|
, detail::get_signature(f)
|
|
, kw.range()
|
|
, mpl::int_<Keywords::size>()
|
|
);
|
|
}
|
|
|
|
template <class F, class CallPolicies, class Signature>
|
|
object make_constructor_dispatch(F f, CallPolicies const& policies, Signature const& sig, mpl::false_)
|
|
{
|
|
return detail::make_constructor_aux(
|
|
f
|
|
, policies
|
|
, sig
|
|
);
|
|
}
|
|
// }
|
|
}
|
|
|
|
// These overloaded functions wrap a function or member function
|
|
// pointer as a Python object, using optional CallPolicies,
|
|
// Keywords, and/or Signature. @group {
|
|
//
|
|
template <class F>
|
|
object make_constructor(F f)
|
|
{
|
|
return detail::make_constructor_aux(
|
|
f,default_call_policies(), detail::get_signature(f));
|
|
}
|
|
|
|
template <class F, class CallPolicies>
|
|
object make_constructor(F f, CallPolicies const& policies)
|
|
{
|
|
return detail::make_constructor_aux(
|
|
f, policies, detail::get_signature(f));
|
|
}
|
|
|
|
template <class F, class CallPolicies, class KeywordsOrSignature>
|
|
object make_constructor(
|
|
F f
|
|
, CallPolicies const& policies
|
|
, KeywordsOrSignature const& keywords_or_signature)
|
|
{
|
|
typedef typename
|
|
detail::is_reference_to_keywords<KeywordsOrSignature&>::type
|
|
is_kw;
|
|
|
|
return detail::make_constructor_dispatch(
|
|
f
|
|
, policies
|
|
, keywords_or_signature
|
|
, is_kw()
|
|
);
|
|
}
|
|
|
|
template <class F, class CallPolicies, class Keywords, class Signature>
|
|
object make_constructor(
|
|
F f
|
|
, CallPolicies const& policies
|
|
, Keywords const& kw
|
|
, Signature const& sig
|
|
)
|
|
{
|
|
return detail::make_constructor_aux(
|
|
f
|
|
, policies
|
|
, sig
|
|
, kw.range()
|
|
, mpl::int_<Keywords::size>()
|
|
);
|
|
}
|
|
// }
|
|
|
|
}}
|
|
|
|
|
|
#endif // MAKE_CONSTRUCTOR_DWA20011221_HPP
|