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// 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_FUNCTION_DWA20011221_HPP
# define MAKE_FUNCTION_DWA20011221_HPP
# include <boost/python/detail/prefix.hpp>
# include <boost/python/default_call_policies.hpp>
# include <boost/python/args.hpp>
# include <boost/python/detail/caller.hpp>
# include <boost/python/object/function_object.hpp>
# include <boost/mpl/size.hpp>
# include <boost/mpl/int.hpp>
namespace boost { namespace python {
namespace detail
{
// make_function_aux --
//
// These helper functions for make_function (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.
template <class F, class CallPolicies, class Sig>
object make_function_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
)
{
return objects::function_object(
detail::caller<F,CallPolicies,Sig>(f, p)
);
}
// 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_function_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;
return objects::function_object(
detail::caller<F,CallPolicies,Sig>(f, p)
, kw);
}
// Helpers for make_function when called with 3 arguments. These
// dispatch functions are used to discriminate between the cases
// when the 3rd argument is keywords or when it is a signature.
//
// @group {
template <class F, class CallPolicies, class Keywords>
object make_function_dispatch(F f, CallPolicies const& policies, Keywords const& kw, mpl::true_)
{
return detail::make_function_aux(
f
, policies
, detail::get_signature(f)
, kw.range()
, mpl::int_<Keywords::size>()
);
}
template <class F, class CallPolicies, class Signature>
object make_function_dispatch(F f, CallPolicies const& policies, Signature const& sig, mpl::false_)
{
return detail::make_function_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_function(F f)
{
return detail::make_function_aux(
f,default_call_policies(), detail::get_signature(f));
}
template <class F, class CallPolicies>
object make_function(F f, CallPolicies const& policies)
{
return detail::make_function_aux(
f, policies, detail::get_signature(f));
}
template <class F, class CallPolicies, class KeywordsOrSignature>
object make_function(
F f
, CallPolicies const& policies
, KeywordsOrSignature const& keywords_or_signature)
{
typedef typename
detail::is_reference_to_keywords<KeywordsOrSignature&>::type
is_kw;
return detail::make_function_dispatch(
f
, policies
, keywords_or_signature
, is_kw()
);
}
template <class F, class CallPolicies, class Keywords, class Signature>
object make_function(
F f
, CallPolicies const& policies
, Keywords const& kw
, Signature const& sig
)
{
return detail::make_function_aux(
f
, policies
, sig
, kw.range()
, mpl::int_<Keywords::size>()
);
}
// }
}}
#endif // MAKE_FUNCTION_DWA20011221_HPP
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