50 lines
1.9 KiB
C++
50 lines
1.9 KiB
C++
/*
|
|
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 )
|
|
#define UINT_CONSTANT( name, value ) TYPE_CONSTANT ( name, value, unsigned int )
|
|
|
|
STRING_CONSTANT( EmptyString, "" );
|
|
|
|
#endif
|