python/include/boost/python/make_function.hpp at develop · BoostGSoC21/python · GitHub

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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(

, 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(

, 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(

, 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(

, policies

, sig

, kw.range()

, mpl::int_<Keywords::size>()

);

}

// }

}}

#endif // MAKE_FUNCTION_DWA20011221_HPP

python/include/boost/python/make_function.hpp at develop · BoostGSoC21/python · GitHub

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