1 | // Copyright David Abrahams 2001. |
2 | // Distributed under the Boost Software License, Version 1.0. (See |
3 | // accompanying file LICENSE_1_0.txt or copy at |
4 | // http://www.boost.org/LICENSE_1_0.txt) |
5 | #ifndef MAKE_FUNCTION_DWA20011221_HPP |
6 | # define MAKE_FUNCTION_DWA20011221_HPP |
7 | |
8 | # include <boost/python/detail/prefix.hpp> |
9 | |
10 | # include <boost/python/default_call_policies.hpp> |
11 | # include <boost/python/args.hpp> |
12 | # include <boost/python/detail/caller.hpp> |
13 | |
14 | # include <boost/python/object/function_object.hpp> |
15 | |
16 | # include <boost/mpl/size.hpp> |
17 | # include <boost/mpl/int.hpp> |
18 | |
19 | namespace boost { namespace python { |
20 | |
21 | namespace detail |
22 | { |
23 | // make_function_aux -- |
24 | // |
25 | // These helper functions for make_function (below) do the raw work |
26 | // of constructing a Python object from some invokable entity. See |
27 | // <boost/python/detail/caller.hpp> for more information about how |
28 | // the Sig arguments is used. |
29 | template <class F, class CallPolicies, class Sig> |
30 | object make_function_aux( |
31 | F f // An object that can be invoked by detail::invoke() |
32 | , CallPolicies const& p // CallPolicies to use in the invocation |
33 | , Sig const& // An MPL sequence of argument types expected by F |
34 | ) |
35 | { |
36 | return objects::function_object( |
37 | detail::caller<F,CallPolicies,Sig>(f, p) |
38 | ); |
39 | } |
40 | |
41 | // As above, except that it accepts argument keywords. NumKeywords |
42 | // is used only for a compile-time assertion to make sure the user |
43 | // doesn't pass more keywords than the function can accept. To |
44 | // disable all checking, pass mpl::int_<0> for NumKeywords. |
45 | template <class F, class CallPolicies, class Sig, class NumKeywords> |
46 | object make_function_aux( |
47 | F f |
48 | , CallPolicies const& p |
49 | , Sig const& |
50 | , detail::keyword_range const& kw // a [begin,end) pair of iterators over keyword names |
51 | , NumKeywords // An MPL integral type wrapper: the size of kw |
52 | ) |
53 | { |
54 | enum { arity = mpl::size<Sig>::value - 1 }; |
55 | |
56 | typedef typename detail::error::more_keywords_than_function_arguments< |
57 | NumKeywords::value, arity |
58 | >::too_many_keywords assertion; |
59 | |
60 | return objects::function_object( |
61 | detail::caller<F,CallPolicies,Sig>(f, p) |
62 | , kw); |
63 | } |
64 | |
65 | // Helpers for make_function when called with 3 arguments. These |
66 | // dispatch functions are used to discriminate between the cases |
67 | // when the 3rd argument is keywords or when it is a signature. |
68 | // |
69 | // @group { |
70 | template <class F, class CallPolicies, class Keywords> |
71 | object make_function_dispatch(F f, CallPolicies const& policies, Keywords const& kw, mpl::true_) |
72 | { |
73 | return detail::make_function_aux( |
74 | f |
75 | , policies |
76 | , detail::get_signature(f) |
77 | , kw.range() |
78 | , mpl::int_<Keywords::size>() |
79 | ); |
80 | } |
81 | |
82 | template <class F, class CallPolicies, class Signature> |
83 | object make_function_dispatch(F f, CallPolicies const& policies, Signature const& sig, mpl::false_) |
84 | { |
85 | return detail::make_function_aux( |
86 | f |
87 | , policies |
88 | , sig |
89 | ); |
90 | } |
91 | // } |
92 | |
93 | } |
94 | |
95 | // These overloaded functions wrap a function or member function |
96 | // pointer as a Python object, using optional CallPolicies, |
97 | // Keywords, and/or Signature. |
98 | // |
99 | // @group { |
100 | template <class F> |
101 | object make_function(F f) |
102 | { |
103 | return detail::make_function_aux( |
104 | f,default_call_policies(), detail::get_signature(f)); |
105 | } |
106 | |
107 | template <class F, class CallPolicies> |
108 | object make_function(F f, CallPolicies const& policies) |
109 | { |
110 | return detail::make_function_aux( |
111 | f, policies, detail::get_signature(f)); |
112 | } |
113 | |
114 | template <class F, class CallPolicies, class KeywordsOrSignature> |
115 | object make_function( |
116 | F f |
117 | , CallPolicies const& policies |
118 | , KeywordsOrSignature const& keywords_or_signature) |
119 | { |
120 | typedef typename |
121 | detail::is_reference_to_keywords<KeywordsOrSignature&>::type |
122 | is_kw; |
123 | |
124 | return detail::make_function_dispatch( |
125 | f |
126 | , policies |
127 | , keywords_or_signature |
128 | , is_kw() |
129 | ); |
130 | } |
131 | |
132 | template <class F, class CallPolicies, class Keywords, class Signature> |
133 | object make_function( |
134 | F f |
135 | , CallPolicies const& policies |
136 | , Keywords const& kw |
137 | , Signature const& sig |
138 | ) |
139 | { |
140 | return detail::make_function_aux( |
141 | f |
142 | , policies |
143 | , sig |
144 | , kw.range() |
145 | , mpl::int_<Keywords::size>() |
146 | ); |
147 | } |
148 | // } |
149 | |
150 | }} |
151 | |
152 | |
153 | #endif // MAKE_FUNCTION_DWA20011221_HPP |
154 | |