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# Abseil - C++ Common Libraries
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The repository contains the Abseil C++ library code. Abseil is an open-source
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collection of C++ code (compliant to C++11) designed to augment the C++
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standard library.
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## Table of Contents
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- [About Abseil](#about)
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- [Quickstart](#quickstart)
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- [Building Abseil](#build)
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- [Codemap](#codemap)
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- [License](#license)
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- [Links](#links)
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<a name="about"></a>
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## About Abseil
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Abseil is an open-source collection of C++ library code designed to augment
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the C++ standard library. The Abseil library code is collected from Google's
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own C++ code base, has been extensively tested and used in production, and
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is the same code we depend on in our daily coding lives.
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In some cases, Abseil provides pieces missing from the C++ standard; in
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others, Abseil provides alternatives to the standard for special needs
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we've found through usage in the Google code base. We denote those cases
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clearly within the library code we provide you.
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Abseil is not meant to be a competitor to the standard library; we've
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just found that many of these utilities serve a purpose within our code
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base, and we now want to provide those resources to the C++ community as
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a whole.
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<a name="quickstart"></a>
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## Quickstart
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If you want to just get started, make sure you at least run through the
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[Abseil Quickstart](https://abseil.io/docs/cpp/quickstart). The Quickstart
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contains information about setting up your development environment, downloading
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the Abseil code, running tests, and getting a simple binary working.
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<a name="build"></a>
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## Building Abseil
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[Bazel](https://bazel.build) is the official build system for Abseil,
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which is supported on most major platforms (Linux, Windows, macOS, for example)
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and compilers. See the [quickstart](https://abseil.io/docs/cpp/quickstart) for
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more information on building Abseil using the Bazel build system.
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<a name="cmake"></a>
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If you require CMake support, please check the
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[CMake build instructions](CMake/README.md).
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## Codemap
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Abseil contains the following C++ library components:
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* [`base`](absl/base/) Abseil Fundamentals
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<br /> The `base` library contains initialization code and other code which
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all other Abseil code depends on. Code within `base` may not depend on any
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other code (other than the C++ standard library).
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* [`algorithm`](absl/algorithm/)
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<br /> The `algorithm` library contains additions to the C++ `<algorithm>`
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library and container-based versions of such algorithms.
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* [`container`](absl/container/)
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<br /> The `container` library contains additional STL-style containers,
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including Abseil's unordered "Swiss table" containers.
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* [`debugging`](absl/debugging/)
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<br /> The `debugging` library contains code useful for enabling leak
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checks, and stacktrace and symbolization utilities.
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* [`hash`](absl/hash/)
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<br /> The `hash` library contains the hashing framework and default hash
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functor implementations for hashable types in Abseil.
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* [`memory`](absl/memory/)
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<br /> The `memory` library contains C++11-compatible versions of
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`std::make_unique()` and related memory management facilities.
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* [`meta`](absl/meta/)
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<br /> The `meta` library contains C++11-compatible versions of type checks
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available within C++14 and C++17 versions of the C++ `<type_traits>` library.
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* [`numeric`](absl/numeric/)
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<br /> The `numeric` library contains C++11-compatible 128-bit integers.
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* [`status`](absl/status/)
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<br /> The `status` library is used within Google for error handling utilizing the
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following two main abstractions: `absl::Status` and `absl::StatusOr<T>`.
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* [`strings`](absl/strings/)
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<br /> The `strings` library contains a variety of strings routines and
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utilities, including a C++11-compatible version of the C++17
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`std::string_view` type.
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* [`synchronization`](absl/synchronization/)
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<br /> The `synchronization` library contains concurrency primitives (Abseil's
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`absl::Mutex` class, an alternative to `std::mutex`) and a variety of
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synchronization abstractions.
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* [`time`](absl/time/)
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<br /> The `time` library contains abstractions for computing with absolute
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points in time, durations of time, and formatting and parsing time within
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time zones.
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* [`types`](absl/types/)
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<br /> The `types` library contains non-container utility types, like a
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C++11-compatible version of the C++17 `std::optional` type.
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* [`utility`](absl/utility/)
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<br /> The `utility` library contains utility and helper code.
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## License
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The Abseil C++ library is licensed under the terms of the Apache
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license. See [LICENSE](LICENSE) for more information.
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## Links
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For more information about Abseil:
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* Consult our [Abseil Introduction](https://abseil.io/about/intro)
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* Read [Why Adopt Abseil](https://abseil.io/about/philosophy) to understand our
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design philosophy.
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* Peruse our
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[Abseil Compatibility Guarantees](https://abseil.io/about/compatibility) to
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understand both what we promise to you, and what we expect of you in return.
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