diff options
Diffstat (limited to 'boost/interprocess/indexes/null_index.hpp')
-rw-r--r-- | boost/interprocess/indexes/null_index.hpp | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/boost/interprocess/indexes/null_index.hpp b/boost/interprocess/indexes/null_index.hpp new file mode 100644 index 0000000000..81c88be79b --- /dev/null +++ b/boost/interprocess/indexes/null_index.hpp @@ -0,0 +1,68 @@ +////////////////////////////////////////////////////////////////////////////// +// +// (C) Copyright Ion Gaztanaga 2005-2011. Distributed under the Boost +// Software License, Version 1.0. (See accompanying file +// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) +// +// See http://www.boost.org/libs/interprocess for documentation. +// +////////////////////////////////////////////////////////////////////////////// +#ifndef BOOST_INTERPROCESS_NULL_INDEX_HPP +#define BOOST_INTERPROCESS_NULL_INDEX_HPP + +#include <boost/interprocess/detail/config_begin.hpp> +#include <boost/interprocess/detail/workaround.hpp> + +#include <boost/interprocess/offset_ptr.hpp> + +//!\file +//!Describes a null index adaptor, so that if we don't want to construct +//!named objects, we can use this null index type to save resources. + +namespace boost { +namespace interprocess { + +//!Null index type +//!used to save compilation time when +//!named indexes are not needed. +template <class MapConfig> +class null_index +{ + /// @cond + typedef typename MapConfig:: + segment_manager_base segment_manager_base; + /// @endcond + + public: + typedef void * iterator; + typedef const void * const_iterator; + + //!begin() is equal + //!to end() + const_iterator begin() const + { return const_iterator(0); } + + //!begin() is equal + //!to end() + iterator begin() + { return iterator(0); } + + //!begin() is equal + //!to end() + const_iterator end() const + { return const_iterator(0); } + + //!begin() is equal + //!to end() + iterator end() + { return iterator(0); } + + //!Empty constructor + null_index(segment_manager_base *){} +}; + +}} //namespace boost { namespace interprocess { + +#include <boost/interprocess/detail/config_end.hpp> + +#endif //#ifndef BOOST_INTERPROCESS_NULL_INDEX_HPP |