Abseil - C++ Common Libraries
The repository contains the Abseil C++ library code. Abseil is an open-source
collection of C++ code (compliant to C++17) designed to augment the C++
standard library.
Table of Contents
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 follows Google's Foundational C++ Support
Policy. See
this
table
for a list of currently supported versions compilers, platforms, and build
tools.
Codemap
Abseil contains the following C++ library components:
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
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.crc The crc library contains code for
computing error-detecting cyclic redundancy checks on data.debugging
The debugging library contains code useful for enabling leak
checks, and stacktrace and symbolization utilities.flags
The flags library contains code for handling command line flags for
libraries and binaries built with Abseil.hash
The hash library contains the hashing framework and default hash
functor implementations for hashable types in Abseil.log
The log library contains LOG and CHECK macros and facilities
for writing logged messages out to disk, stderr, or user-extensible
destinations.memory
The memory library contains memory management facilities that augment
C++'s <memory> library.meta
The meta library contains type checks
similar to those available in the C++ <type_traits> library.numeric
The numeric library contains 128-bit integer types as well as
implementations of C++20's bitwise math functions.profiling
The profiling library contains utility code for profiling C++
entities. It is currently a private dependency of other Abseil libraries.random
The random library contains functions for generating pseudorandom
values.status
The status library contains abstractions for error handling,
specifically absl::Status and absl::StatusOr<T>.strings
The strings library contains a variety of strings routines and
utilities.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.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.
Links
For more information about Abseil:
Abseil 是 Google 开源的一套 C++ 库代码集合，用于增强 C++ 标准库的功能。它提取自 Google 的内部代码库，包含更好用的容器、字符串工具、时间处理和同步原语等组件。