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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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