roll: third_party/pigweed pw_ring_buffer: Make iterator entry mutable
Provide a distinction between iterator and const_iterator such that
iterator contains a pw::ByteSpan buffer (mutable data) and
const_iterator contains pw::ConstByteSpan buffer (const data).
Enable copy constructors and stricter iterator equality checks:
- Iterators not pointing to the end must also point to the same data in
order to be considered equal.
- Const iterators can be copied to other const iterators.
- Const iterators cannot be copied to mutable iterators.
- Mutable iterators can be copied to both mutable and const iterators.
Original-BUG: b/406109661
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/280661
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Original-Revision: de2fc4187ae346aef11c6ee1e204a89ef03d3e5e
Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: cc646fb3f6af61..de2fc4187ae346
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8718591231414446929
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If0abb23680045bd309536eeb20d8e6e96fe06ff8
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/281152
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index cc646fb..de2fc41 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit cc646fb3f6af61249949982cfe91447b4802ff13
+Subproject commit de2fc4187ae346aef11c6ee1e204a89ef03d3e5e
