Chris@16: // Copyright David Abrahams 2002.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: #ifndef PROXY_DWA2002615_HPP
Chris@16: # define PROXY_DWA2002615_HPP
Chris@16: # include <boost/python/detail/prefix.hpp>
Chris@16: # include <boost/python/object_core.hpp>
Chris@16: # include <boost/python/object_operators.hpp>
Chris@16: 
Chris@16: namespace boost { namespace python { namespace api {
Chris@16: 
Chris@16: template <class Policies>
Chris@16: class proxy : public object_operators<proxy<Policies> >
Chris@16: {
Chris@16:     typedef typename Policies::key_type key_type;
Chris@16:     
Chris@16: # if !defined(BOOST_MSVC) || BOOST_MSVC >= 1300
Chris@16:     typedef proxy const& assignment_self;
Chris@16: # else
Chris@16:     typedef proxy assignment_self;
Chris@16: # endif
Chris@16:  public:
Chris@16:     proxy(object const& target, key_type const& key);
Chris@16:     operator object() const;
Chris@16: 
Chris@16:     // to support a[b] = c[d]
Chris@16:     proxy const& operator=(assignment_self) const;
Chris@16:     
Chris@16:     template <class T>
Chris@16:     inline proxy const& operator=(T const& rhs) const
Chris@16:     {
Chris@16:         Policies::set(m_target, m_key, object(rhs));
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16:  public: // implementation detail
Chris@16:     void del() const;
Chris@16:         
Chris@16:  private:
Chris@16:     object m_target;
Chris@16:     key_type m_key;
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: template <class T>
Chris@16: inline void del(proxy<T> const& x)
Chris@16: {
Chris@16:     x.del();
Chris@16: }
Chris@16: 
Chris@16: //
Chris@16: // implementation
Chris@16: //
Chris@16: 
Chris@16: template <class Policies>
Chris@16: inline proxy<Policies>::proxy(object const& target, key_type const& key)
Chris@16:     : m_target(target), m_key(key)
Chris@16: {}
Chris@16: 
Chris@16: template <class Policies>
Chris@16: inline proxy<Policies>::operator object() const
Chris@16: {
Chris@16:     return Policies::get(m_target, m_key);
Chris@16: }
Chris@16: 
Chris@16: // to support a[b] = c[d]
Chris@16: template <class Policies>
Chris@16: inline proxy<Policies> const& proxy<Policies>::operator=(typename proxy::assignment_self rhs) const
Chris@16: {
Chris@16:     return *this = python::object(rhs);
Chris@16: }
Chris@16: 
Chris@16: # define BOOST_PYTHON_PROXY_INPLACE(op)                                         \
Chris@16: template <class Policies, class R>                                              \
Chris@16: proxy<Policies> const& operator op(proxy<Policies> const& lhs, R const& rhs)    \
Chris@16: {                                                                               \
Chris@16:     object old(lhs);                                                            \
Chris@16:     return lhs = (old op rhs);                                                  \
Chris@16: } 
Chris@16: BOOST_PYTHON_PROXY_INPLACE(+=)
Chris@16: BOOST_PYTHON_PROXY_INPLACE(-=)
Chris@16: BOOST_PYTHON_PROXY_INPLACE(*=)
Chris@16: BOOST_PYTHON_PROXY_INPLACE(/=)
Chris@16: BOOST_PYTHON_PROXY_INPLACE(%=)
Chris@16: BOOST_PYTHON_PROXY_INPLACE(<<=)
Chris@16: BOOST_PYTHON_PROXY_INPLACE(>>=)
Chris@16: BOOST_PYTHON_PROXY_INPLACE(&=)
Chris@16: BOOST_PYTHON_PROXY_INPLACE(^=)
Chris@16: BOOST_PYTHON_PROXY_INPLACE(|=)
Chris@16: # undef BOOST_PYTHON_PROXY_INPLACE
Chris@16: 
Chris@16: template <class Policies>
Chris@16: inline void proxy<Policies>::del() const
Chris@16: {
Chris@16:     Policies::del(m_target, m_key);
Chris@16: }
Chris@16: 
Chris@16: }}} // namespace boost::python::api
Chris@16: 
Chris@16: #endif // PROXY_DWA2002615_HPP