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Update absl::Span and std::span differences comment

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PiperOrigin-RevId: 856366482
Change-Id: I55a33a56f83ed2c0bf30bd14a08c770f18e13d32
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Abseil Team
2026-01-14 14:30:38 -08:00
committed by Copybara-Service
parent 5b086d78c4
commit eef1a08f4b
1 changed files with 2 additions and 3 deletions
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5
absl/types/span.h
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@@ -30,18 +30,17 @@
// `Span<const T>` when such types may be difficult to identify due to issues
// with implicit conversion.
//
// The C++20 draft standard includes a `std::span` type. As of June 2020, the
// The C++20 standard includes a `std::span` type. As of January 2026, the
// differences between `absl::Span` and `std::span` are:
// * `absl::Span` has `operator==` (which is likely a design bug,
// per https://abseil.io/blog/20180531-regular-types)
// * `absl::Span` has the factory functions `MakeSpan()` and
// `MakeConstSpan()`
// * bounds-checked access to `absl::Span` is accomplished with `at()`
// however `std::span` now supports the same as of the draft C++26 standard
// * `absl::Span` has compiler-provided move and copy constructors and
// assignment. This is due to them being specified as `constexpr`, but that
// implies const in C++11.
// * A read-only `absl::Span<const T>` can be implicitly constructed from an
// initializer list.
// * `absl::Span` has no `bytes()`, `size_bytes()`, `as_bytes()`, or
// `as_writable_bytes()` methods
// * `absl::Span` has no static extent template parameter, nor constructors