ShVariantCast.hpp

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// Sh: A GPU metaprogramming language.
//
// Copyright 2003-2006 Serious Hack Inc.
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
// MA  02110-1301, USA
#ifndef SHVARIANTCAST_HPP
#define SHVARIANTCAST_HPP

#include "ShDllExport.hpp"
#include "ShVariableType.hpp"
#include "ShDataType.hpp"
#include "ShVariant.hpp"

namespace SH {

// forward declaration
class ShVariant;


class 
SH_DLLEXPORT
ShVariantCast {
  public:
    virtual ~ShVariantCast() {}

    virtual void doCast(ShVariant* dest, const ShVariant* src) const = 0;
    // @}

    virtual void getCastTypes(ShValueType &dest, ShDataType &destDT, 
                              ShValueType &src, ShDataType &srcDT) const = 0;

    virtual void getDestTypes(ShValueType &valueType, ShDataType &dataType) const = 0;
};

template<typename Dest, ShDataType DestDT, 
  typename Src, ShDataType SrcDT>
struct ShDataVariantCast: public ShVariantCast {
  public:
    static const ShValueType DestValueType = ShStorageTypeInfo<Dest>::value_type;
    static const ShValueType SrcValueType = ShStorageTypeInfo<Src>::value_type;
    typedef typename ShDataTypeCppType<Dest, DestDT>::type D;
    typedef typename ShDataTypeCppType<Src, SrcDT>::type S;

    typedef ShDataVariant<Dest, DestDT> DestVariant;
    typedef const ShDataVariant<Src, SrcDT> SrcVariant;

    void doCast(ShVariant* dest, const ShVariant* src) const;

    void getCastTypes(ShValueType &dest, ShDataType &destDT, 
                      ShValueType &src, ShDataType &srcDT) const;

    void getDestTypes(ShValueType &valueType, ShDataType &dataType) const; 

    void doCast(D &dest, const S &src) const;

    static const ShDataVariantCast *instance();
  private:
    static ShDataVariantCast *m_instance;
    ShDataVariantCast() {}
};


}

#include "ShVariantCastImpl.hpp"

#endif

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