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abseil
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Abseil Common Libraries (C++)

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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 and CMake are the official build systems for Abseil.

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 and CMake Quickstart.

Support

Abseil is officially supported on many platforms. See the Abseil platform support guide for details on supported operating systems, compilers, CPUs, etc.

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++
    
    library and container-based versions of such algorithms.
  • cleanup

    The
    cleanup
    library contains the control-flow-construct-like type
    absl::Cleanup
    which is used for executing a callback on scope exit.
  • 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++
     library.
  • numeric

    The
    numeric
    library contains C++11-compatible 128-bit integers.
  • status

    The
    status
    contains abstractions for error handling, specifically
    absl::Status
    and
    absl::StatusOr
    .
  • 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.

Releases

Abseil recommends users "live-at-head" (update to the latest commit from the master branch as often as possible). However, we realize this philosophy doesn't work for every project, so we also provide Long Term Support Releases to which we backport fixes for severe bugs. See our release management document for more details.

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:

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