00001 // 00002 // aegis - project change supervisor 00003 // Copyright (C) 1994, 1996, 2002, 2005-2008 Peter Miller 00004 // 00005 // This program is free software; you can redistribute it and/or modify 00006 // it under the terms of the GNU General Public License as published by 00007 // the Free Software Foundation; either version 3 of the License, or 00008 // (at your option) any later version. 00009 // 00010 // This program is distributed in the hope that it will be useful, 00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00013 // GNU General Public License for more details. 00014 // 00015 // You should have received a copy of the GNU General Public License 00016 // along with this program. If not, see 00017 // <http://www.gnu.org/licenses/>. 00018 // 00019 00020 #ifndef AEGIS_AER_VALUE_NULL_H 00021 #define AEGIS_AER_VALUE_NULL_H 00022 00023 #include <libaegis/aer/value.h> 00024 00028 class rpt_value_null: 00029 public rpt_value 00030 { 00031 public: 00035 virtual ~rpt_value_null(); 00036 00037 private: 00042 rpt_value_null(); 00043 00044 public: 00049 static rpt_value::pointer create(); 00050 00051 protected: 00052 // See base class for documentation. 00053 const char *name() const; 00054 00055 // See base class for documentation. 00056 rpt_value::pointer arithmetic_or_null() const; 00057 00058 // See base class for documentation. 00059 rpt_value::pointer stringize_or_null() const; 00060 00061 // See base class for documentation. 00062 rpt_value::pointer booleanize_or_null() const; 00063 00064 // See base class for documentation. 00065 rpt_value::pointer lookup(const rpt_value::pointer &rhs, bool lvalue) const; 00066 00067 // See base class for documentation. 00068 rpt_value::pointer undefer() const; 00069 00070 // See base class for documentation. 00071 rpt_value::pointer integerize_or_null() const; 00072 00073 // See base class for documentation. 00074 rpt_value::pointer realize_or_null() const; 00075 00076 // See base class for documentation. 00077 rpt_value::pointer keys() const; 00078 00079 // See base class for documentation. 00080 rpt_value::pointer count() const; 00081 00082 private: 00086 rpt_value_null(const rpt_value_null &); 00087 00091 rpt_value_null &operator=(const rpt_value_null &); 00092 }; 00093 00094 #endif // AEGIS_AER_VALUE_NULL_H
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