Chris@16: //-----------------------------------------------------------------------------
Chris@16: // boost variant/detail/backup_holder.hpp header file
Chris@16: // See http://www.boost.org for updates, documentation, and revision history.
Chris@16: //-----------------------------------------------------------------------------
Chris@16: //
Chris@16: // Copyright (c) 2003
Chris@16: // Eric Friedman
Chris@16: //
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: 
Chris@16: #ifndef BOOST_VARIANT_DETAIL_BACKUP_HOLDER_HPP
Chris@16: #define BOOST_VARIANT_DETAIL_BACKUP_HOLDER_HPP
Chris@16: 
Chris@16: #include "boost/config.hpp"
Chris@16: #include "boost/assert.hpp"
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace detail { namespace variant {
Chris@16: 
Chris@16: template <typename T>
Chris@16: class backup_holder
Chris@16: {
Chris@16: private: // representation
Chris@16: 
Chris@16:     T* backup_;
Chris@16: 
Chris@16: public: // structors
Chris@16: 
Chris@101:     ~backup_holder() BOOST_NOEXCEPT
Chris@16:     {
Chris@16:         delete backup_;
Chris@16:     }
Chris@16: 
Chris@16:     explicit backup_holder(T* backup) BOOST_NOEXCEPT
Chris@16:         : backup_(backup)
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     backup_holder(const backup_holder&);
Chris@16: 
Chris@16: public: // modifiers
Chris@16: 
Chris@16:     backup_holder& operator=(const backup_holder& rhs)
Chris@16:     {
Chris@16:         *backup_ = rhs.get();
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16:     backup_holder& operator=(const T& rhs)
Chris@16:     {
Chris@16:         *backup_ = rhs;
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16:     void swap(backup_holder& rhs) BOOST_NOEXCEPT
Chris@16:     {
Chris@16:         T* tmp = rhs.backup_;
Chris@16:         rhs.backup_ = this->backup_;
Chris@16:         this->backup_ = tmp;
Chris@16:     }
Chris@16: 
Chris@16: public: // queries
Chris@16: 
Chris@101:     T& get() BOOST_NOEXCEPT
Chris@16:     {
Chris@16:         return *backup_;
Chris@16:     }
Chris@16: 
Chris@101:     const T& get() const BOOST_NOEXCEPT
Chris@16:     {
Chris@16:         return *backup_;
Chris@16:     }
Chris@16: 
Chris@16: };
Chris@16: 
Chris@16: template <typename T>
Chris@16: backup_holder<T>::backup_holder(const backup_holder&)
Chris@16:     : backup_(0)
Chris@16: {
Chris@16:     // not intended for copy, but do not want to prohibit syntactically
Chris@16:     BOOST_ASSERT(false);
Chris@16: }
Chris@16: 
Chris@16: template <typename T>
Chris@16: void swap(backup_holder<T>& lhs, backup_holder<T>& rhs) BOOST_NOEXCEPT
Chris@16: {
Chris@16:     lhs.swap(rhs);
Chris@16: }
Chris@16: 
Chris@16: }} // namespace detail::variant
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // BOOST_VARIANT_DETAIL_BACKUP_HOLDER_HPP