tree 0a8295b6f5c7e6d2d6b42f580d890617b58455ab
parent e8f3e42c22d463ba3d12de02aff4cd4f36d3256a
author Wyatt Hepler <hepler@google.com> 1653687819 -0700
committer CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com> 1654033301 +0000

C++20 compatibility fixes

- C++20's std::span is more strict about conversions from custom
  containers than Pigweed's span. Update some containers and iterators
  to comply.
- C++20's std::span prevents construction from std::nullptr_t. Add a
  pointer cast to std::span(nullptr, size).
- Add polyfill for std::contiguous_iterator_tag to pw_containers.
- Add missing #include for pw_polyfill/language_feature_macros.h.

Fixed: 635
Change-Id: Ia9f5e0ba6b055879670efd74c0c0e7aad90cb8e0
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/96441
Reviewed-by: Ted Pudlik <tpudlik@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Pigweed-Auto-Submit: Wyatt Hepler <hepler@google.com>