ceph/src/boost/libs/core/include/boost/core/null_deleter.hpp

   1 /*
   2  *          Copyright Andrey Semashev 2007 - 2014.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   null_deleter.hpp
   9  * \author Andrey Semashev
  10  * \date   22.04.2007
  11  *
  12  * This header contains a \c null_deleter implementation. This is an empty
  13  * function object that receives a pointer and does nothing with it.
  14  * Such empty deletion strategy may be convenient, for example, when
  15  * constructing <tt>shared_ptr</tt>s that point to some object that should not be
  16  * deleted (i.e. a variable on the stack or some global singleton, like <tt>std::cout</tt>).
  17  */
  18
  19 #ifndef BOOST_CORE_NULL_DELETER_HPP
  20 #define BOOST_CORE_NULL_DELETER_HPP
  21
  22 #include <boost/config.hpp>
  23
  24 #ifdef BOOST_HAS_PRAGMA_ONCE
  25 #pragma once
  26 #endif
  27
  28 namespace boost {
  29
  30 //! A function object that does nothing and can be used as an empty deleter for \c shared_ptr
  31 struct null_deleter
  32 {
  33     //! Function object result type
  34     typedef void result_type;
  35     /*!
  36      * Does nothing
  37      */
  38     template< typename T >
  39     void operator() (T*) const BOOST_NOEXCEPT {}
  40 };
  41
  42 } // namespace boost
  43
  44 #endif // BOOST_CORE_NULL_DELETER_HPP