154 lines
4.4 KiB
C++
154 lines
4.4 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_FUNCTION_DWA20011221_HPP
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# define MAKE_FUNCTION_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/detail/caller.hpp>
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# include <boost/python/object/function_object.hpp>
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# include <boost/mpl/size.hpp>
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# include <boost/mpl/int.hpp>
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namespace boost { namespace python {
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namespace detail
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{
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// make_function_aux --
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//
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// These helper functions for make_function (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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template <class F, class CallPolicies, class Sig>
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object make_function_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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return objects::function_object(
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detail::caller<F,CallPolicies,Sig>(f, p)
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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_function_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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return objects::function_object(
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detail::caller<F,CallPolicies,Sig>(f, p)
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, kw);
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}
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// Helpers for make_function when called with 3 arguments. These
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// dispatch functions are used to discriminate between the cases
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// when the 3rd argument is keywords or when it is a signature.
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//
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// @group {
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template <class F, class CallPolicies, class Keywords>
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object make_function_dispatch(F f, CallPolicies const& policies, Keywords const& kw, mpl::true_)
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{
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return detail::make_function_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_function_dispatch(F f, CallPolicies const& policies, Signature const& sig, mpl::false_)
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{
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return detail::make_function_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.
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//
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// @group {
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template <class F>
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object make_function(F f)
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{
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return detail::make_function_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_function(F f, CallPolicies const& policies)
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{
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return detail::make_function_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_function(
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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_function_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_function(
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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_function_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_FUNCTION_DWA20011221_HPP
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