| 1 | /* |
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| 2 | * Copyright Andrey Semashev 2007 - 2014. |
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| 3 | * Distributed under the Boost Software License, Version 1.0. |
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| 4 | * (See accompanying file LICENSE_1_0.txt or copy at |
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| 5 | * http://www.boost.org/LICENSE_1_0.txt) |
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| 6 | */ |
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| 7 | /*! |
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| 8 | * \file null_deleter.hpp |
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| 9 | * \author Andrey Semashev |
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| 10 | * \date 22.04.2007 |
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| 11 | * |
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| 12 | * This header contains a \c null_deleter implementation. This is an empty |
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| 13 | * function object that receives a pointer and does nothing with it. |
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| 14 | * Such empty deletion strategy may be convenient, for example, when |
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| 15 | * constructing <tt>shared_ptr</tt>s that point to some object that should not be |
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| 16 | * deleted (i.e. a variable on the stack or some global singleton, like <tt>std::cout</tt>). |
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| 17 | */ |
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| 18 | |
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| 19 | #ifndef BOOST_CORE_NULL_DELETER_HPP |
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| 20 | #define BOOST_CORE_NULL_DELETER_HPP |
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| 21 | |
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| 22 | #include <boost/config.hpp> |
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| 23 | |
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| 24 | #ifdef BOOST_HAS_PRAGMA_ONCE |
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| 25 | #pragma once |
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| 26 | #endif |
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| 27 | |
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| 28 | namespace boost { |
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| 29 | |
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| 30 | //! A function object that does nothing and can be used as an empty deleter for \c shared_ptr |
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| 31 | struct null_deleter |
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| 32 | { |
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| 33 | //! Function object result type |
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| 34 | typedef void result_type; |
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| 35 | /*! |
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| 36 | * Does nothing |
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| 37 | */ |
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| 38 | template< typename T > |
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| 39 | void operator() (T*) const BOOST_NOEXCEPT {} |
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| 40 | }; |
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| 41 | |
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| 42 | } // namespace boost |
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| 43 | |
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| 44 | #endif // BOOST_CORE_NULL_DELETER_HPP |
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| 45 | |
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