As of this CL, Attribute no longer implements RTCStatsMemberInterface
and a member no longer owns knowing its own name. The attribute knows
the name because we pass it down at construction time.
To achieve this, the WEBRTC_RTCSTATS_IMPL() macro is updated to take
AttributeInits instead of raw member pointers, i.e. (name, ptr) pairs.
By constructing RTCStatsMember<T> without a name parameter, it does the
same thing as the absl::optional<T> constructor. So RTCStatsMember<T>'s
days are numbered!
Bug: webrtc:15164
Change-Id: I560c0134bae1c2d7218426a1576425ecc1b677a7
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/334203
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Evan Shrubsole <eshr@google.com>
Cr-Commit-Position: refs/heads/main@{#41540}
One in series of CLs to migrate from Members() to Attributes() to
unblock code deletion.
Adds and makes use of has_value(), holds_alternative<T>() and get<T>()
convenience methods.
Bug: webrtc:15164
Change-Id: I2ae9869a5d1de3f3875c70494c9781d69da7f936
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/334160
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Evan Shrubsole <eshr@google.com>
Cr-Commit-Position: refs/heads/main@{#41510}
The plan is to replace Members() with Attributes() instead.
For backwards-compatability during the transition, Attribute implements
RTCStatsMemberInterface but the two classes serve the same purpose
which is to allow iterating all metrics of a stats object.
The reason for moving away from "members" is that we already have a way
to express a variable that maybe has a value: absl::optional<T>. The
only information the member adds is the const char* name(), which we'll
move to Attribute in a future CL.
We don't need to maintain an RTCStatsMemberInterface::Type enum in the
future because absl::variant<T> has absl::holds_alternative<T>.
Step 1: Add Attributes().
Step 2: Migrate to Attributes() and delete Members().
Step 3: Replaces all uses of RTCStatsMember<T> with absl::optional<T>
and delete RTCStatsMember + RTCStatsMemberInterface.
Bug: webrtc:15164
Change-Id: I3fdd5b24214bb5cc340a54a0171df73b516e1803
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/333840
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#41507}
