2 Copyright (C) 2001-2006, William Joseph.
5 This file is part of GtkRadiant.
7 GtkRadiant is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 GtkRadiant is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GtkRadiant; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 #if !defined(INCLUDED_GENERIC_CONSTANT_H)
23 #define INCLUDED_GENERIC_CONSTANT_H
26 /// \brief Language extensions for constants that are guaranteed to be evaluated at compile-time.
28 /// \brief A compile-time-constant as a type.
29 template<typename Type>
30 struct ConstantWrapper
32 typedef typename Type::Value Value;
33 operator Value() const
35 return Type::evaluate();
38 template<typename TextOutputStreamType, typename Type>
39 inline TextOutputStreamType& ostream_write(TextOutputStreamType& ostream, const ConstantWrapper<Type>& c)
41 return ostream_write(ostream, typename Type::Value(c));
44 #define TYPE_CONSTANT(name, value, type) struct name##_CONSTANT_ { typedef type Value; static Value evaluate() { return value; } }; typedef ConstantWrapper<name##_CONSTANT_> name
45 #define STRING_CONSTANT(name, value) TYPE_CONSTANT(name, value, const char*)
46 #define INTEGER_CONSTANT(name, value) TYPE_CONSTANT(name, value, int)
48 STRING_CONSTANT(EmptyString, "");