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.

About Abseil
Quickstart
Building Abseil
Support
Codemap
Releases
License
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. 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++ <algorithm> 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++ <type_traits> library.
numeric
The numeric library contains C++11-compatible 128-bit integers.
profiling
The profiling library contains utility code for profiling C++ entities. It is currently a private dependency of other Abseil libraries.
status
The status contains abstractions for error handling, specifically absl::Status and absl::StatusOr<T>.
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.

README.md

Abseil - C++ Common Libraries

Table of Contents