source: NonGTP/Boost/boost/python/proxy.hpp @ 857

Revision 857, 2.8 KB checked in by igarcia, 19 years ago (diff)
RevLine 
[857]1// Copyright David Abrahams 2002.
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 PROXY_DWA2002615_HPP
6# define PROXY_DWA2002615_HPP
7# include <boost/python/detail/prefix.hpp>
8# include <boost/python/object_core.hpp>
9# include <boost/python/object_operators.hpp>
10
11namespace boost { namespace python { namespace api {
12
13template <class Policies>
14class proxy : public object_operators<proxy<Policies> >
15{
16    typedef typename Policies::key_type key_type;
17   
18# if !defined(BOOST_MSVC) || BOOST_MSVC > 1200
19    typedef proxy const& assignment_self;
20# else
21    typedef proxy assignment_self;
22# endif
23 public:
24    proxy(object const& target, key_type const& key);
25    operator object() const;
26
27    // to support a[b] = c[d]
28    proxy const& operator=(assignment_self) const;
29   
30    template <class T>
31    inline proxy const& operator=(T const& rhs) const
32    {
33        Policies::set(m_target, m_key, object(rhs));
34        return *this;
35    }
36
37 public: // implementation detail
38    void del() const;
39       
40 private:
41    object m_target;
42    key_type m_key;
43};
44
45
46template <class T>
47inline void del(proxy<T> const& x)
48{
49    x.del();
50}
51
52//
53// implementation
54//
55
56template <class Policies>
57inline proxy<Policies>::proxy(object const& target, key_type const& key)
58    : m_target(target), m_key(key)
59{}
60
61template <class Policies>
62inline proxy<Policies>::operator object() const
63{
64    return Policies::get(m_target, m_key);
65}
66
67// to support a[b] = c[d]
68template <class Policies>
69inline proxy<Policies> const& proxy<Policies>::operator=(typename proxy::assignment_self rhs) const
70{
71    return *this = python::object(rhs);
72}
73
74# define BOOST_PYTHON_PROXY_INPLACE(op)                                         \
75template <class Policies, class R>                                              \
76proxy<Policies> const& operator op(proxy<Policies> const& lhs, R const& rhs)    \
77{                                                                               \
78    object old(lhs);                                                            \
79    return lhs = (old op rhs);                                                  \
80}
81BOOST_PYTHON_PROXY_INPLACE(+=)
82BOOST_PYTHON_PROXY_INPLACE(-=)
83BOOST_PYTHON_PROXY_INPLACE(*=)
84BOOST_PYTHON_PROXY_INPLACE(/=)
85BOOST_PYTHON_PROXY_INPLACE(%=)
86BOOST_PYTHON_PROXY_INPLACE(<<=)
87BOOST_PYTHON_PROXY_INPLACE(>>=)
88BOOST_PYTHON_PROXY_INPLACE(&=)
89BOOST_PYTHON_PROXY_INPLACE(^=)
90BOOST_PYTHON_PROXY_INPLACE(|=)
91# undef BOOST_PYTHON_PROXY_INPLACE
92
93template <class Policies>
94inline void proxy<Policies>::del() const
95{
96    Policies::del(m_target, m_key);
97}
98
99}}} // namespace boost::python::api
100
101#endif // PROXY_DWA2002615_HPP
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