class InputTask : public ITask
 { 
  public:

  ...

   bool CurrentKey(usint _index)
    {
     return (actKeys[_index] != 0 );
    }
    
// -------------------------------------------------        
    
   bool OldKey(usint _index)
    {
     return (oldKeys[_index] != 0 );
    }
    
// -------------------------------------------------        
   
   bool KeyboardKeyNowDown(usint _index)
    {
     return ( (CurrentKey(_index))) && (!OldKey(_index));
    }     
    
// -------------------------------------------------

   bool KeyboardKeyStillDown(usint _index)
    {
     return ( CurrentKey(_index)) && ( OldKey(_index));
    }
    
// -------------------------------------------------        
   
   uchar * actKeys;
   uchar * oldKeys;
   ulint keyCount;
    
 };


bool InputTask :: Start()
 {
  actKeys = SDL_GetKeyState((int*) &keyCount );
  oldKeys = new uchar[keyCount];
  
  if (!oldKeys) return false;

  SDL_PumpEvents();
  SDL_PumpEvents();
  return true; 
 }

void InputTask :: Update()
 {
  SDL_PumpEvents();
  ... 
  memcpy( oldKeys, actKeys, sizeof(uchar) * keyCount);
  actKeys = SDL_GetKeyState((int*) &keyCount); 
 }

void InputTask :: Stop()
 {  
  delete [] oldKeys;   
 }