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Squashed 'third_party/abseil_cpp/' changes from 768eb2ca2..ccdbb5941

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git-subtree-dir: third_party/abseil_cpp
git-subtree-split: ccdbb5941f992fabda7eae3ce72f55efc17c826a
This commit is contained in:
Vincent Ambo 2020-06-17 14:53:10 +01:00
parent 768eb2ca28
commit 8f2828c4b4
97 changed files with 3546 additions and 2316 deletions
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15
absl/types/span.h
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@ -27,22 +27,17 @@
// `Span<const T>` when such types may be difficult to identify due to issues
// with implicit conversion.
//
// The C++ standards committee currently has a proposal for a `std::span` type,
// (http://wg21.link/p0122), which is not yet part of the standard (though may
// become part of C++20). As of August 2017, the differences between
// `absl::Span` and this proposal are:
// * `absl::Span` uses `size_t` for `size_type`
// * `absl::Span` has no `operator()`
// * `absl::Span` has no constructors for `std::unique_ptr` or
// `std::shared_ptr`
// The C++20 draft standard includes a `std::span` type. As of June 2020, 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()`
// * `absl::Span` has `front()` and `back()` methods
// * bounds-checked access to `absl::Span` is accomplished with `at()`
// * `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.
// * `absl::Span` has no `element_type` or `index_type` typedefs
// * `absl::Span` has no `element_type` typedef
// * 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