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