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// Copyright (C) 2000-2003, Luca Padovani <luca.padovani@cs.unibo.it>.
//
// This file is part of GtkMathView, a Gtk widget for MathML.
//
// GtkMathView 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.
//
// GtkMathView 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 GtkMathView; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// For details, see the GtkMathView World-Wide-Web page,
// http://helm.cs.unibo.it/mml-widget, or send a mail to
// <luca.padovani@cs.unibo.it>
#ifndef __Variant_hh__
#define __Variant_hh__
#include <vector>
#include "SmartPtr.hh"
#include "Value.hh"
template <typename T>
class GMV_MathView_EXPORT Variant : public Value
{
protected:
Variant(const T& v) : value(v) { }
virtual ~Variant() { }
public:
static SmartPtr<Variant> create(const T& v) { return new Variant(v); }
T getValue(void) const { return value; }
private:
T value;
};
template <>
class GMV_MathView_EXPORT Variant<void> : public Value
{
protected:
Variant(void) { }
virtual ~Variant() { }
public:
static SmartPtr< Variant<void> > create(void)
{ return new Variant(); }
};
// The following full specialization is for sequences of Values
// There are more accessor methods and getValue returns a
// const reference instead of a copy fo the object
template <>
class GMV_MathView_EXPORT Variant< std::vector< SmartPtr<Value> > > : public Value
{
protected:
Variant(const std::vector< SmartPtr<Value> >& v) : content(v) { }
virtual ~Variant() { }
public:
static SmartPtr< Variant< std::vector< SmartPtr<Value> > > > create(const std::vector< SmartPtr<Value> >& v)
{ return new Variant(v); }
const std::vector< SmartPtr<Value> >& getValue(void) const { return content; }
unsigned getSize(void) const { return content.size(); }
SmartPtr<Value> getValue(unsigned i) const { return content[i]; }
private:
std::vector< SmartPtr<Value> > content;
};
typedef Variant< std::vector< SmartPtr<Value> > > ValueSequence;
template <typename T>
/* GMV_MathView_EXPORT */ T
as(const Value* v)
{
if (const Variant<T>* obj = dynamic_cast<const Variant<T>*>(v))
return obj->getValue();
else
throw Value::TypeError();
}
#endif // __Variant_hh__
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