Chris@102: /*
Chris@102:  *          Copyright Andrey Semashev 2007 - 2014.
Chris@102:  * Distributed under the Boost Software License, Version 1.0.
Chris@102:  *    (See accompanying file LICENSE_1_0.txt or copy at
Chris@102:  *          http://www.boost.org/LICENSE_1_0.txt)
Chris@102:  */
Chris@102: /*!
Chris@102:  * \file   null_deleter.hpp
Chris@102:  * \author Andrey Semashev
Chris@102:  * \date   22.04.2007
Chris@102:  *
Chris@102:  * This header contains a \c null_deleter implementation. This is an empty
Chris@102:  * function object that receives a pointer and does nothing with it.
Chris@102:  * Such empty deletion strategy may be convenient, for example, when
Chris@102:  * constructing <tt>shared_ptr</tt>s that point to some object that should not be
Chris@102:  * deleted (i.e. a variable on the stack or some global singleton, like <tt>std::cout</tt>).
Chris@102:  */
Chris@102: 
Chris@102: #ifndef BOOST_CORE_NULL_DELETER_HPP
Chris@102: #define BOOST_CORE_NULL_DELETER_HPP
Chris@102: 
Chris@102: #include <boost/config.hpp>
Chris@102: 
Chris@102: #ifdef BOOST_HAS_PRAGMA_ONCE
Chris@102: #pragma once
Chris@102: #endif
Chris@102: 
Chris@102: namespace boost {
Chris@102: 
Chris@102: //! A function object that does nothing and can be used as an empty deleter for \c shared_ptr
Chris@102: struct null_deleter
Chris@102: {
Chris@102:     //! Function object result type
Chris@102:     typedef void result_type;
Chris@102:     /*!
Chris@102:      * Does nothing
Chris@102:      */
Chris@102:     template< typename T >
Chris@102:     void operator() (T*) const BOOST_NOEXCEPT {}
Chris@102: };
Chris@102: 
Chris@102: } // namespace boost
Chris@102: 
Chris@102: #endif // BOOST_CORE_NULL_DELETER_HPP