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153 lines
4.4 KiB
153 lines
4.4 KiB
// 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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