Move headers to core; add quickbook documentation

include/boost/utility/null_deleter.hpp

@@ -1,44 +1,9 @@
-/*
- *          Copyright Andrey Semashev 2007 - 2014.
- * 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)
- */
-/*!
- * \file   null_deleter.hpp
- * \author Andrey Semashev
- * \date   22.04.2007
- *
- * This header contains a \c null_deleter implementation. This is an empty
- * function object that receives a pointer and does nothing with it.
- * Such empty deletion strategy may be convenient, for example, when
- * constructing <tt>shared_ptr</tt>s that point to some object that should not be
- * deleted (i.e. a variable on the stack or some global singleton, like <tt>std::cout</tt>).
- */
+#ifndef BOOST_UTILITY_NULL_DELETER_HPP
+#define BOOST_UTILITY_NULL_DELETER_HPP
 
-#ifndef BOOST_UTILITY_NULL_DELETER_HPP_INCLUDED_
-#define BOOST_UTILITY_NULL_DELETER_HPP_INCLUDED_
+// The header file at this path is deprecated;
+// use boost/core/null_deleter.hpp instead.
 
-#include <boost/config.hpp>
+#include <boost/core/null_deleter.hpp>
 
-#ifdef BOOST_HAS_PRAGMA_ONCE
-#pragma once
 #endif
-
-namespace boost {
-
-//! A function object that does nothing and can be used as an empty deleter for \c shared_ptr
-struct null_deleter
-{
-    //! Function object result type
-    typedef void result_type;
-    /*!
-     * Does nothing
-     */
-    template< typename T >
-    void operator() (T*) const BOOST_NOEXCEPT {}
-};
-
-} // namespace boost
-
-#endif // BOOST_UTILITY_NULL_DELETER_HPP_INCLUDED_