gob encode and decode pointers

gob_pointers.go

func encodePointer(encoder *gob.Encoder, ptr any) error {                                                                                                                                                        
    isNil := ptr == nil || (reflect.ValueOf(ptr).Kind() == reflect.Ptr && reflect.ValueOf(ptr).IsNil())                                                                                                          
    if err := encoder.Encode(isNil); err != nil {                                                                                                                                                                
        return err                                                                                                                                                                                               
    }                                                                                                                                                                                                            
    if isNil {                                                                                                                                                                                                   
        return nil                                                                                                                                                                                               
    }                                                                                                                                                                                                            
    return encoder.Encode(ptr)                                                                                                                                                                                   
}                                                                                                                                                                                                                
                                                                                                                                                                                                                 
func decodePointer(decoder *gob.Decoder, ptr any) error {                                                                                                                                                        
    var isNil bool                                                                                                                                                                                               
    err := decoder.Decode(&isNil)                                                                                                                                                                                
    if err != nil {                                                                                                                                                                                              
        return err                                                                                                                                                                                               
    }                                                                                                                                                                                                            
    if isNil {                                                                                                                                                                                                   
        return nil                                                                                                                                                                                               
    }                                                                                                                                                                                                            
    return decoder.Decode(ptr)                                                                                                                                                                                   
}