98 lines
2.7 KiB
C++
98 lines
2.7 KiB
C++
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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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typedef proxy const& assignment_self;
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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
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