ossrv_pub/boost_apis/boost/python/proxy.hpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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// Copyright David Abrahams 2002.
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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 PROXY_DWA2002615_HPP
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# define PROXY_DWA2002615_HPP
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# include <boost/python/detail/prefix.hpp>
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# include <boost/python/object_core.hpp>
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# include <boost/python/object_operators.hpp>
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namespace boost { namespace python { namespace api {
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template <class Policies>
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class proxy : public object_operators<proxy<Policies> >
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{
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    typedef typename Policies::key_type key_type;
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# if !defined(BOOST_MSVC) || BOOST_MSVC >= 1300
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    typedef proxy const& assignment_self;
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# else
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    typedef proxy assignment_self;
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# endif
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 public:
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    proxy(object const& target, key_type const& key);
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    operator object() const;
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    // to support a[b] = c[d]
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    proxy const& operator=(assignment_self) const;
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    template <class T>
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    inline proxy const& operator=(T const& rhs) const
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    {
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        Policies::set(m_target, m_key, object(rhs));
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        return *this;
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    }
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 public: // implementation detail
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    void del() const;
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 private:
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    object m_target;
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    key_type m_key;
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};
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template <class T>
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inline void del(proxy<T> const& x)
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{
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    x.del();
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}
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//
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// implementation
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//
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template <class Policies>
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inline proxy<Policies>::proxy(object const& target, key_type const& key)
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    : m_target(target), m_key(key)
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{}
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template <class Policies>
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inline proxy<Policies>::operator object() const
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{
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    return Policies::get(m_target, m_key);
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}
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// to support a[b] = c[d]
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template <class Policies>
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inline proxy<Policies> const& proxy<Policies>::operator=(typename proxy::assignment_self rhs) const
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{
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    return *this = python::object(rhs);
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}
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# define BOOST_PYTHON_PROXY_INPLACE(op)                                         \
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template <class Policies, class R>                                              \
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proxy<Policies> const& operator op(proxy<Policies> const& lhs, R const& rhs)    \
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{                                                                               \
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    object old(lhs);                                                            \
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    return lhs = (old op rhs);                                                  \
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} 
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BOOST_PYTHON_PROXY_INPLACE(+=)
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BOOST_PYTHON_PROXY_INPLACE(-=)
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BOOST_PYTHON_PROXY_INPLACE(*=)
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BOOST_PYTHON_PROXY_INPLACE(/=)
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BOOST_PYTHON_PROXY_INPLACE(%=)
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BOOST_PYTHON_PROXY_INPLACE(<<=)
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BOOST_PYTHON_PROXY_INPLACE(>>=)
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BOOST_PYTHON_PROXY_INPLACE(&=)
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BOOST_PYTHON_PROXY_INPLACE(^=)
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BOOST_PYTHON_PROXY_INPLACE(|=)
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# undef BOOST_PYTHON_PROXY_INPLACE
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template <class Policies>
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inline void proxy<Policies>::del() const
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{
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    Policies::del(m_target, m_key);
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}
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}}} // namespace boost::python::api
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#endif // PROXY_DWA2002615_HPP