Constructor wani kekaike ne na musammu wanda ya gudu lokacin da aka likita wani abu, ana amfani da shi don tulawa yanayin sa zuwa takaici daidai. Destructor (ko finalizer) yana gudu lokacin da aka lalata wani abu, ana amfani da shi don tsaftace albarkatawa.
{
String host;
{
(host == )
();
.host = host;
}
}
Magajiya mai kyau tana tabbatar da cewa abu ba ya taɓa gamu da ba daidai ba jiya.
class FileWriter:
def __init__(self, path):
self.f = open(path, "w") # acquire resource
def close(self):
self.f.close() # explicit cleanup
def __enter__(self): return self
def __exit__(self, *a): self.close() # deterministic cleanup
with FileWriter("out.txt") as w: # closed automatically at block end
pass
| Alhali | Hanyar Tsaftace |
|---|---|
| C++ | Destructor ~T(), yana gudu da hankali |
| Java/C# | GC + finalize/Dispose (ba tare da hankali ba; yi amfani da try-with-resources / using) |
| Python | __del__ (lokacin da ba a amince da shi); fi wa context managers |
A cikin yare mai tsarin gida, kada ka dogara ga finalizers don bude fayiloli, socks, ko gida — lokaci tukuru ba a sani ba. Yi amfani da bayyane close/Dispose/context managers.
Constructors sune garanti tawa cewa kowane abu yana fara daidai — maddubi mafi kyau don tilasta akwatin da daidita.
Tsaftace ya zama mahimmaci saboda albarkatawan talakoki (bubajar fayil, haɗin) suma idan ba a lokaci shi ba, kuma dogarin GC don su yana haifar da ƙarar da ba a iya ganin ta, mai wahala na debug.