luaLightUserdata.h

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/************************************************************************
**
** Copyright (C) 2009 K2FS Sistemas e Projetos Ltd.  
** All rights reserved.
**
************************************************************************/

#ifndef _LUA_LIGHTUSERDATA_H_
#define _LUA_LIGHTUSERDATA_H_

#include "luaConfig.h"
#include <QVariant>

class LuaEnv;

class LUAUTILS_API_EXPORT LuaLightUserdata
{
public:

  LuaLightUserdata();
  LuaLightUserdata(LuaEnv* env, void* data);
  LuaLightUserdata(LuaEnv* env, int index);
  
  void     push();
  QVariant toVariant() const;

  bool isNull() const { return _data == NULL; } 

  template <class T> T* value() { return (T*)_data; }

private:
  LuaEnv* _lua;  
  void*   _data; 
};

Q_DECLARE_METATYPE(LuaLightUserdata);


template <class T> T* LuaLightUserdataValue(QVariant val)
{
  if(val.isNull() || !val.canConvert<LuaLightUserdata>())
    return NULL;
  LuaLightUserdata ud = val.value<LuaLightUserdata>();
  return ud.value<T>();
}

#endif