fix memory leak in CCUserDefault (#19853) #19947
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fastSet makes the Data object managing a new memory area in [bytes, bytes + size), but it doesn't releasing the old data it managed. Failure to release the old data causes memory leak. The default constructed Data manages null memory, so calling fastSet on it is fine. Because `Data ret = defaultValue;` malloc new memory, we might have better performance without it.
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fastSet makes the Data object managing a new memory area in
[bytes, bytes + size), but it doesn't releasing the old data
it managed. Failure to release the old data causes memory leak.
The default constructed Data manages null memory, so calling
fastSet on it is fine.
Because
Data ret = defaultValue;malloc new memory, we mighthave better performance without it.