一句话概括，这个库的特点是用 C++ 11 的代码实现了许多 C++ 14 和 C++ 17 的特性，所以你的编 译器也要支持 C++ 11（gcc 4.8+/clang 3.3+，不同平台略有差异）。
需要注意一点的是 Google 内部代码是不支持异常（Excepton）的，C++ 异常的优劣之处有许多讨论 （知乎上的讨论），不用异常可以在一定程度上利于编译器优化，这里主要可能还是历史支持原因。如果 你的项目是支持异常的建议要好好测试一下，具体参考下 abseil / Abseil Fundamentals 。
Abseil 简要组成部分如下：
- base Abseil Fundamentals ：包含初始化代码和其它部分依赖的代码。除了 C++ 标准库外不依赖外部代码
- algorithm ：C++ 库的增强
- container ：STL 风格容器
- debugging ：内存泄露检查
- memory ：智能指针和内存管理
- meta ：用 C++11 兼容代码支持 C++14 和 C++17 版本的 <type_traits> 库
- numeric ：支持 C++11 兼容的 128 位整数
- strings ：string 相关函数增强
- synchronization ：同步原语和抽象支持
- time ：时间方面的计算
- types ：非容器类型的工具类型
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.
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.
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.
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.
Abseil is officially supported on many platforms. See the Abseil platform support guide for details on supported operating systems, compilers, CPUs, etc.
Abseil contains the following C++ library components:
baseAbseil Fundamentals
Thebaselibrary contains initialization code and other code which all other Abseil code depends on. Code withinbasemay not depend on any other code (other than the C++ standard library).algorithm
Thealgorithmlibrary contains additions to the C++<algorithm>library and container-based versions of such algorithms.cleanup
Thecleanuplibrary contains the control-flow-construct-like typeabsl::Cleanupwhich is used for executing a callback on scope exit.container
Thecontainerlibrary contains additional STL-style containers, including Abseil's unordered "Swiss table" containers.debugging
Thedebugginglibrary contains code useful for enabling leak checks, and stacktrace and symbolization utilities.hash
Thehashlibrary contains the hashing framework and default hash functor implementations for hashable types in Abseil.memory
Thememorylibrary contains C++11-compatible versions ofstd::make_unique()and related memory management facilities.meta
Themetalibrary contains C++11-compatible versions of type checks available within C++14 and C++17 versions of the C++<type_traits>library.numeric
Thenumericlibrary contains C++11-compatible 128-bit integers.status
Thestatuscontains abstractions for error handling, specificallyabsl::Statusandabsl::StatusOr<T>.strings
Thestringslibrary contains a variety of strings routines and utilities, including a C++11-compatible version of the C++17std::string_viewtype.synchronization
Thesynchronizationlibrary contains concurrency primitives (Abseil'sabsl::Mutexclass, an alternative tostd::mutex) and a variety of synchronization abstractions.time
Thetimelibrary contains abstractions for computing with absolute points in time, durations of time, and formatting and parsing time within time zones.types
Thetypeslibrary contains non-container utility types, like a C++11-compatible version of the C++17std::optionaltype.utility
Theutilitylibrary contains utility and helper code.
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.
The Abseil C++ library is licensed under the terms of the Apache license. See LICENSE for more information.
For more information about Abseil:
- Consult our Abseil Introduction
- Read Why Adopt Abseil to understand our design philosophy.
- Peruse our Abseil Compatibility Guarantees to understand both what we promise to you, and what we expect of you in return.