Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
803 views
in Technique[技术] by (71.8m points)

iphone - NSString copy not copying?

  NSString *myString = @"sample string";
  NSString *newString = [myString copy];

If I set a breakpoint after these two lines, the pointer for myString is the same as the pointer for newString.

WTF? Isn't NSString copy supposed to return a pointer to a new object? Or am I missing something fundamental about how copy is supposed to work?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

Since NSString is not mutable it might just internally increase ref count and be done with it.

When you release one of those NSStrings it might just decrement ref count - standard memory management.

Do you see any issues with that?


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

2.1m questions

2.1m answers

60 comments

56.9k users

...