Swift 6.4: Warning for Weak Captures Within Nested Closures
New in Swift 6.4 […] is a warning which is emitted when a nested closure performs a
weakcapture while the parent closure implicitly captures that object as a strong reference.At first glance, that new diagnostic could be a bit puzzling, since it might seem unnecessary to have to specify such a weak capture twice (or, alternatively, move it to the parent closure’s capture list), but it turns out that it’s an incredibly useful new warning that can help us avoid a quite common kind of memory management bug.
[…]
Finally, in situations where capturing
selfstrongly doesn’t actually lead to a retain cycle, we can silence the new warning for nestedweakcaptures by explicitly addingselfto the outer closure’s capture list, such as when creating aTaskwithin the following example[…]
Previously:
- Swift 6.4
- Xcode 27 Announced
- How to Automate Memory Leak Detection With XCTest
- Avoiding Implicit Retain Cycles When Using Swift Function References
- Weak Self: Closure Rules of Thumb
- Swift “guard” Capture Specifier Pitch
- Implicit Capturing of Self in Swift 5.3
- Dealing With Weak in Closure-based Delegation
- Stop the weak-strong Swift Dance
