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accessorvalue.h
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accessorvalue.h
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/*
* The Doomsday Engine Project -- libdeng2
*
* Copyright (c) 2009-2013 Jaakko Keränen <jaakko.keranen@iki.fi>
*
* This program 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.
*
* This program 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 this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef LIBDENG2_ACCESSORVALUE_H
#define LIBDENG2_ACCESSORVALUE_H
#include "../TextValue"
#include "../Variable"
namespace de {
/**
* Special text value that provides access to properties of another object.
*
* @ingroup data
*/
class AccessorValue : public TextValue
{
public:
/// Mode to use for variables that have an accessor value.
static Variable::Flags const VARIABLE_MODE;
public:
AccessorValue();
/// Update the text content of the accessor.
virtual void update() const = 0;
/// Creates a new value with the content of the accessor. The returned
/// value should not be an AccessorValue.
virtual Value *duplicateContent() const = 0;
Value *duplicate() const;
Number asNumber() const;
Text asText() const;
dsize size() const;
bool isTrue() const;
dint compare(Value const &value) const;
void sum(Value const &value);
void multiply(Value const &value);
void divide(Value const &value);
void modulo(Value const &divisor);
void operator >> (Writer &to) const;
void operator << (Reader &from);
};
} // namespace de
#endif /* LIBDENG2_ACCESSORVALUE_H */