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