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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](#about)
- [Codemap](#codemap)
- [License](#license)
- [Links](#links)
- [Build with cmake](#cmake)
<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.
## Codemap
Abseil contains the following C++ library components:
* [`base`](absl/base/) Abseil Fundamentals
<br /> 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/)
<br /> The `algorithm` library contains additions to the C++ `<algorithm>`
library and container-based versions of such algorithms.
* [`container`](absl/container/)
<br /> The `container` library contains additional STL-style containers.
* [`debugging`](absl/debugging/)
<br /> The `debugging` library contains code useful for enabling leak
checks. Future updates will add stacktrace and symbolization utilities.
* [`memory`](absl/memory/)
<br /> The `memory` library contains C++11-compatible versions of
`std::make_unique()` and related memory management facilities.
* [`meta`](absl/meta/)
<br /> 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`](absl/numeric/)
<br /> The `numeric` library contains C++11-compatible 128-bit integers.
* [`strings`](absl/strings/)
<br /> 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`](absl/synchronization/)
<br /> 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/)
<br /> 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/)
<br /> The `types` library contains non-container utility types, like a
C++11-compatible version of the C++17 `std::optional` type.
## 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](http://abseil.io/about/intro)
* Read [Why Adopt Abseil](http://abseil.io/about/philosophy) to understand our
design philosophy.
* Peruse our
[Abseil Compatibility Guarantees](http://abseil.io/about/compatibility) to
understand both what we promise to you, and what we expect of you in return.
<a name="cmake"></a>
## Build with CMake
Please check the [CMake build instructions](CMake/README.md)
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