Export of internal Abseil changes

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f34cd235a12ad0ee1fea3a1ee5a427272dc2b285 by Abseil Team <absl-team@google.com>:

Migrates uses of deprecated map types to recommended types.

PiperOrigin-RevId: 309945156

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e3410a47ad32c0775b6911610bc47b22938decad by Matthew Brown <matthewbr@google.com>:

Internal Change

PiperOrigin-RevId: 309856021

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a58cfa25e0bb59e7fa9647ac1aae65eaccff0086 by Greg Falcon <gfalcon@google.com>:

Internal change.

PiperOrigin-RevId: 309804612

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cdc5ec310035fbe25f496bda283fe655d94d7769 by Mark Barolak <mbar@google.com>:

Standardize the header comments for friend functions in cord.h

PiperOrigin-RevId: 309779073

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fe61602701be795e54477b0fdbf5ffc1df12a6b7 by Samuel Benzaquen <sbenza@google.com>:

Implement %f natively for any input.
It evaluates the input at runtime and allocates stack space accordingly.

This removes a potential fallback into snprintf, improves performance, and removes all memory allocations in this formatting path.

PiperOrigin-RevId: 309752501

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79e2a24f3f959e8b06ddf1d440bbabbd5f89b5b7 by Greg Falcon <gfalcon@google.com>:

Add a Cord::swap() method.  Many other Abseil types already provide this, but it was missing here.

We already provided a two-argument free function form of `swap()`, but that API is better suited for generic code.  The swap member function is a better API when the types are known.

PiperOrigin-RevId: 309751740

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85cdf60024f153fb4fcb7fe68ed2b14b9faf119d by Derek Mauro <dmauro@google.com>:

Cleanup uses of "linker initialized" SpinLocks

PiperOrigin-RevId: 309581867

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9e5443bfcec4b94056b13c75326576e987ab88fb by Matt Kulukundis <kfm@google.com>:

Clarify intended mixing properties of `absl::Hash`

PiperOrigin-RevId: 309520174

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a0630f0827b67f217aaeae68a448fe4c1101e17d by Greg Falcon <gfalcon@google.com>:

Comment out a test in Emscripten to sidestep `long double` issues.

PiperOrigin-RevId: 309482953
GitOrigin-RevId: f34cd235a12ad0ee1fea3a1ee5a427272dc2b285
Change-Id: Icce0c9d547117374d596b9d684e4054ddd118669
24 files changed
tree: 4ed021579b676d6f387ee071e94451689eb5a868
  1. absl/
  2. ci/
  3. CMake/
  4. .clang-format
  5. .gitignore
  6. ABSEIL_ISSUE_TEMPLATE.md
  7. AUTHORS
  8. CMakeLists.txt
  9. conanfile.py
  10. CONTRIBUTING.md
  11. FAQ.md
  12. LICENSE
  13. LTS.md
  14. README.md
  15. UPGRADES.md
  16. WORKSPACE
README.md

Abseil - C++ Common Libraries

The repository contains the Abseil C++ library code. Abseil is an open-source collection of C++ code (compliant to C++11) designed to augment the C++ standard library.

Table of Contents

About Abseil

Abseil is an open-source collection of C++ library code designed to augment the C++ standard library. The Abseil library code is collected from Google's own C++ code base, has been extensively tested and used in production, and is the same code we depend on in our daily coding lives.

In some cases, Abseil provides pieces missing from the C++ standard; in others, Abseil provides alternatives to the standard for special needs we've found through usage in the Google code base. We denote those cases clearly within the library code we provide you.

Abseil is not meant to be a competitor to the standard library; we've just found that many of these utilities serve a purpose within our code base, and we now want to provide those resources to the C++ community as a whole.

Quickstart

If you want to just get started, make sure you at least run through the Abseil Quickstart. The Quickstart contains information about setting up your development environment, downloading the Abseil code, running tests, and getting a simple binary working.

Building Abseil

Bazel is the official build system for Abseil, which is supported on most major platforms (Linux, Windows, macOS, for example) and compilers. See the quickstart for more information on building Abseil using the Bazel build system.

If you require CMake support, please check the CMake build instructions.

Codemap

Abseil contains the following C++ library components:

  • base Abseil Fundamentals
    The base library contains initialization code and other code which all other Abseil code depends on. Code within base may not depend on any other code (other than the C++ standard library).
  • algorithm
    The algorithm library contains additions to the C++ <algorithm> library and container-based versions of such algorithms.
  • container
    The container library contains additional STL-style containers, including Abseil's unordered “Swiss table” containers.
  • debugging
    The debugging library contains code useful for enabling leak checks, and stacktrace and symbolization utilities.
  • hash
    The hash library contains the hashing framework and default hash functor implementations for hashable types in Abseil.
  • memory
    The memory library contains C++11-compatible versions of std::make_unique() and related memory management facilities.
  • meta
    The meta library contains C++11-compatible versions of type checks available within C++14 and C++17 versions of the C++ <type_traits> library.
  • numeric
    The numeric library contains C++11-compatible 128-bit integers.
  • strings
    The strings library contains a variety of strings routines and utilities, including a C++11-compatible version of the C++17 std::string_view type.
  • synchronization
    The synchronization library contains concurrency primitives (Abseil's absl::Mutex class, an alternative to std::mutex) and a variety of synchronization abstractions.
  • time
    The time library contains abstractions for computing with absolute points in time, durations of time, and formatting and parsing time within time zones.
  • types
    The types library contains non-container utility types, like a C++11-compatible version of the C++17 std::optional type.
  • utility
    The utility library contains utility and helper code.

License

The Abseil C++ library is licensed under the terms of the Apache license. See LICENSE for more information.

Links

For more information about Abseil: