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#ifndef COIN_SOSELECTONE_H
#define COIN_SOSELECTONE_H

#include <Inventor/engines/SoSubEngine.h>
#include <Inventor/fields/SoMField.h>
#include <Inventor/fields/SoSFInt32.h>

class SoEngineOutput;


class COIN_DLL_API SoSelectOne : public SoEngine {
  typedef SoEngine inherited;

  SO_ENGINE_HEADER(SoSelectOne);

public:
  SoSFInt32 index;
  SoMField * input;

  SoEngineOutput * output; // The SoSField-version of the SoMField-type.

  SoSelectOne(SoType inputtype);
  static void initClass(void);

private:
  SoSelectOne(void);
  virtual ~SoSelectOne(void);

  virtual void evaluate(void);

  virtual SbBool readInstance(SoInput * in, unsigned short flags);
  virtual void writeInstance(SoOutput * out);

  void initialize(const SoType inputfieldtype);

  virtual void copyContents(const SoFieldContainer * from,
                            SbBool copyconnections);

  // SoSelectOne instances uses a dynamic set of inputs and outputs,
  // as they are not common for all instances of the class (like for
  // most of the other engines).
  SoFieldData * dynamicinput;
  SoEngineOutputData * dynamicoutput;

  // Avoid a g++/egcs warning on the private default constructor.
  friend class dummy;
};

#endif // !COIN_SOSELECTONE_H
