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 ){
40 return ostream_write( ostream, typename Type::Value( c ) );
43 #define TYPE_CONSTANT( name, value, type ) struct name##_CONSTANT_ { typedef type Value; static Value evaluate() { return value; } }; typedef ConstantWrapper<name##_CONSTANT_> name
44 #define STRING_CONSTANT( name, value ) TYPE_CONSTANT ( name, value, const char* )
45 #define INTEGER_CONSTANT( name, value ) TYPE_CONSTANT ( name, value, int )
46 #define UINT_CONSTANT( name, value ) TYPE_CONSTANT ( name, value, unsigned int )
48 STRING_CONSTANT( EmptyString, "" );