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https://github.com/abseil/abseil-cpp

Abseil Common Libraries (C++)
https://github.com/abseil/abseil-cpp

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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++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)





## 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](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.





## 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).





## 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.





## 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++ ``

  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 `` library.

* [`meta`](absl/meta/)

  
 The `meta` library contains compatible versions of type checks

  available within C++14 and C++17 versions of the C++ `` 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`.

* [`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.





## 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.





## License



The Abseil C++ library is licensed under the terms of the Apache

license. See [LICENSE](LICENSE) for more information.





## 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.