Don't set len in BytesMut::reserve
#682
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A fundamental invariant of `reserve` is that it can extend capacity while the stored data remains the same, even if it's moved to a new allocation. As a result, `len` can never change during a call to `reserve`.
Darksonn
reviewed
Apr 8, 2024
| @@ -639,7 +639,6 @@ impl BytesMut { | |||
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| // Update the info | |||
| self.ptr = vptr(v.as_mut_ptr().add(off)); | |||
| self.len = v.len() - off; | |||
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How about asserting that they are equal?
debug_assert_eq!(self.len, v.len() - off);There was a problem hiding this comment.
Works for me! Added in f92c9f6.
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A fundamental invariant of
reserveis that it can extend capacity while the stored data remains the same, even if it's moved to a new allocation. As a result,lencan never change during a call toreserve.