Export of internal Abseil changes

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e5b45b15c19e85aaa33430ac2bd45fcc2e52dad5 by Greg Falcon <gfalcon@google.com>:

Add extra tests exercising ShiftLeft() at boundary conditions, to guard against logic errors in our memory bounds checking.

PiperOrigin-RevId: 339326030

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cdfde78815ca016a57f90f53d08c3335bd355f30 by Evan Brown <ezb@google.com>:

Fix a bug in b-tree erase() and count() in which we weren't accounting for cases where the comparator is heterogeneous and has different equivalence classes for different lookup types.

Optimize equal_range to avoid comparisons when possible.

PiperOrigin-RevId: 339270230

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b4aa337c156fa91f74f25c676c679ae146311968 by Derek Mauro <dmauro@google.com>:

Fix execution of the cmake build scripts when not on Kokoro

PiperOrigin-RevId: 339131253

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fa3d1f602f711be72fde6b5f29d6341b9b5f8a2c by Derek Mauro <dmauro@google.com>:

Update Docker container used for Alpine Linux testing

PiperOrigin-RevId: 339074246
GitOrigin-RevId: e5b45b15c19e85aaa33430ac2bd45fcc2e52dad5
Change-Id: I2cc3adc4de3493203c8a944aedee40efa54af0c0
6 files changed
tree: d2ceea66018cb6d8dab291df01b61c0d22f0755e
  1. .github/
  2. absl/
  3. ci/
  4. CMake/
  5. .clang-format
  6. .gitignore
  7. ABSEIL_ISSUE_TEMPLATE.md
  8. AUTHORS
  9. BUILD.bazel
  10. CMakeLists.txt
  11. conanfile.py
  12. CONTRIBUTING.md
  13. FAQ.md
  14. LICENSE
  15. LTS.md
  16. README.md
  17. UPGRADES.md
  18. 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: