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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++14) designed to augment the C++
standard library.

## Table of Contents

- [About Abseil](#about)
- [Quickstart](#quickstart)
- [Building Abseil](#build)
- [Support](#support)
- [Codemap](#codemap)
- [Releases](#releases)
- [License](#license)
- [Links](#links)

<a name="about"></a>
## 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.

<a name="quickstart"></a>
## Quickstart

If you want to just get started, make sure you at least run through the
[Abseil Quickstart](https://abseil.io/docs/cpp/quickstart). The Quickstart
contains information about setting up your development environment, downloading
the Abseil code, running tests, and getting a simple binary working.

<a name="build"></a>
## Building Abseil

[Bazel](https://bazel.build) and [CMake](https://cmake.org/) are the official
build systems for Abseil.
See the [quickstart](https://abseil.io/docs/cpp/quickstart) for more information
on building Abseil using the Bazel build system.
If you require CMake support, please check the [CMake build
instructions](CMake/README.md) and [CMake
Quickstart](https://abseil.io/docs/cpp/quickstart-cmake).

<a name="support"></a>
## Support

Abseil follows Google's [Foundational C++ Support
Policy](https://opensource.google/documentation/policies/cplusplus-support). See
[this
table](https://github.com/google/oss-policies-info/blob/main/foundational-cxx-support-matrix.md)
for a list of currently supported versions compilers, platforms, and build
tools.

<a name="codemap"></a>
## Codemap

Abseil contains the following C++ library components:

* [`base`](absl/base/)
 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`](absl/algorithm/)
 The `algorithm` library contains additions to the C++ `<algorithm>`
 library and container-based versions of such algorithms.
* [`cleanup`](absl/cleanup/)
 The `cleanup` library contains the control-flow-construct-like type
 `absl::Cleanup` which is used for executing a callback on scope exit.
* [`container`](absl/container/)
 The `container` library contains additional STL-style containers,
 including Abseil's unordered "Swiss table" containers.
* [`crc`](absl/crc/) The `crc` library contains code for
 computing error-detecting cyclic redundancy checks on data.
* [`debugging`](absl/debugging/)
 The `debugging` library contains code useful for enabling leak
 checks, and stacktrace and symbolization utilities.
* [`flags`](absl/flags/)
 The `flags` library contains code for handling command line flags for
 libraries and binaries built with Abseil.
* [`hash`](absl/hash/)
 The `hash` library contains the hashing framework and default hash
 functor implementations for hashable types in Abseil.
* [`log`](absl/log/)
 The `log` library contains `LOG` and `CHECK` macros and facilities
 for writing logged messages out to disk, `stderr`, or user-extensible
 destinations.
* [`memory`](absl/memory/)
 The `memory` library contains memory management facilities that augment
 C++'s `<memory>` library.
* [`meta`](absl/meta/)
 The `meta` library contains compatible versions of type checks
 available within C++14 and C++17 versions of the C++ `<type_traits>` library.
* [`numeric`](absl/numeric/)
 The `numeric` library contains 128-bit integer types as well as
 implementations of C++20's bitwise math functions.
* [`profiling`](absl/profiling/)
 The `profiling` library contains utility code for profiling C++
 entities. It is currently a private dependency of other Abseil libraries.
* [`random`](absl/random/)
 The `random` library contains functions for generating psuedorandom
 values.
* [`status`](absl/status/)
 The `status` library contains abstractions for error handling,
 specifically `absl::Status` and `absl::StatusOr<T>`.
* [`strings`](absl/strings/)
 The `strings` library contains a variety of strings routines and
 utilities, including a C++14-compatible version of the C++17
 `std::string_view` type.
* [`synchronization`](absl/synchronization/)
 The `synchronization` library contains concurrency primitives (Abseil's
 `absl::Mutex` class, an alternative to `std::mutex`) and a variety of
 synchronization abstractions.
* [`time`](absl/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`](absl/types/)
 The `types` library contains non-container utility types, like a
 C++14-compatible version of the C++17 `std::optional` type.
* [`utility`](absl/utility/)
 The `utility` library contains utility and helper code.

<a name="releases"></a>
## 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](https://github.com/abseil/abseil-cpp/releases) to which we backport
fixes for severe bugs. See our [release
management](https://abseil.io/about/releases) document for more details.

<a name="license"></a>
## License

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

<a name="links"></a>
## Links

For more information about Abseil:

* Consult our [Abseil Introduction](https://abseil.io/about/intro)
* Read [Why Adopt Abseil](https://abseil.io/about/philosophy) to understand our
  design philosophy.
* Peruse our
  [Abseil Compatibility Guarantees](https://abseil.io/about/compatibility) to
  understand both what we promise to you, and what we expect of you in return.

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