00001 /* vim: set sw=4 sts=4 et foldmethod=syntax : */ 00002 00003 /* 00004 * Copyright (c) 2006, 2007, 2008, 2009 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_ACCEPT_VISITOR_HH 00021 #define PALUDIS_GUARD_PALUDIS_UTIL_ACCEPT_VISITOR_HH 1 00022 00023 #include <paludis/util/attributes.hh> 00024 00025 namespace paludis 00026 { 00027 /** 00028 * Used by accept_visitor. 00029 * 00030 * \nosubgrouping 00031 * \ingroup g_visitors 00032 */ 00033 template <typename Visitor_> 00034 class PALUDIS_VISIBLE AcceptVisitor 00035 { 00036 private: 00037 Visitor_ & _v; 00038 00039 public: 00040 typedef void result_type; 00041 00042 ///\name Visitor operations 00043 ///\{ 00044 00045 AcceptVisitor(Visitor_ & v) : 00046 _v(v) 00047 { 00048 } 00049 00050 template <typename T_> 00051 void operator() (T_ & t) const 00052 { 00053 t.accept(_v); 00054 } 00055 00056 ///\} 00057 }; 00058 00059 /** 00060 * Convenience function for using a visitor with a standard algorithm. 00061 * 00062 * \ingroup g_visitors 00063 */ 00064 template <typename Visitor_> 00065 AcceptVisitor<Visitor_> PALUDIS_VISIBLE accept_visitor(Visitor_ & v) 00066 { 00067 return AcceptVisitor<Visitor_>(v); 00068 } 00069 } 00070 00071 #endif