00001 /* vim: set sw=4 sts=4 et foldmethod=syntax : */ 00002 00003 /* 00004 * Copyright (c) 2007, 2008 Ciaran McCreesh 00005 * 00006 * This file is part of the Paludis package manager. Paludis is free software; 00007 * you can redistribute it and/or modify it under the terms of the GNU General 00008 * Public License version 2, as published by the Free Software Foundation. 00009 * 00010 * Paludis is distributed in the hope that it will be useful, but WITHOUT ANY 00011 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 00012 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 00013 * details. 00014 * 00015 * You should have received a copy of the GNU General Public License along with 00016 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple 00017 * Place, Suite 330, Boston, MA 02111-1307 USA 00018 */ 00019 00020 #ifndef PALUDIS_GUARD_PALUDIS_UTIL_MAKE_SHARED_PTR_HH 00021 #define PALUDIS_GUARD_PALUDIS_UTIL_MAKE_SHARED_PTR_HH 1 00022 00023 #include <paludis/util/make_shared_ptr-fwd.hh> 00024 #include <tr1/memory> 00025 00026 /** \file 00027 * Declarations for the make_shared_ptr function. 00028 * 00029 * \ingroup g_utils 00030 * 00031 * \section Examples 00032 * 00033 * - None at this time. 00034 */ 00035 00036 namespace paludis 00037 { 00038 template <typename T_> 00039 std::tr1::shared_ptr<T_> 00040 make_shared_ptr(T_ * const t) 00041 { 00042 return std::tr1::shared_ptr<T_>(t); 00043 } 00044 00045 /** 00046 * An object that can convert itself into an empty std::tr1::shared_ptr<> 00047 * of any type. 00048 * 00049 * \see make_null_shared_ptr() 00050 * \since 0.32 00051 * \ingroup g_utils 00052 */ 00053 struct PALUDIS_VISIBLE NullSharedPtr 00054 { 00055 template <typename T_> 00056 inline operator std::tr1::shared_ptr<T_> () const 00057 { 00058 return std::tr1::shared_ptr<T_>(); 00059 } 00060 }; 00061 00062 inline NullSharedPtr make_null_shared_ptr() 00063 { 00064 return NullSharedPtr(); 00065 } 00066 } 00067 00068 #endif