tree e2508d549ff559c20a5b59c4ed808bc14b3b58d7
parent fa0d64b76d0a5a636fbdcf02e3aac7087af7acdd
author Ben Clayton <bclayton@google.com> 1643989103 +0000
committer Tint LUCI CQ <tint-scoped@luci-project-accounts.iam.gserviceaccount.com> 1643989103 +0000

Add tint::Switch()

A type dispatch helper with replaces chains of:

  if (auto* a = obj->As<A>()) {
    ...
  } else if (auto* b = obj->As<B>()) {
    ...
  } else {
    ...
  }

with:

  Switch(obj,
    [&](A* a) { ... },
    [&](B* b) { ... },
    [&](Default) { ... });

This new helper provides greater opportunities for optimizations, avoids
scoping issues with if-else blocks, and is slightly cleaner (IMO).

Bug: tint:1383
Change-Id: Ice469a03342ef57cbcf65f69753e4b528ac50137
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/78543
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: David Neto <dneto@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>