1. Abseil: https://abseil.io/about/design/swisstables

Introduction to Abseil

Welcome to Abseil! Abseil is an open-source collection of C++ code (compliant to C++14) designed to augment the C++ standard library. This document introduces Abseil and provides an overview of the code we’re providing.

Table of Contents

Codemap License Links

Codemap

The Abseil codebase consists of 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.
container
The container library contains additional STL-style 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 memory management facilities that augment C++’s library.
meta
The meta library contains compatible versions of type checks available within C++14 and C++17 versions of 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.
strings
The strings library contains a variety of strings routines and utilities, including a C++14-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++14-compatible version of absl::optional.
utility
The utility library contains utility and helper code.
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:

Walk through the Abseil C++ Quickstart to set up your development environment and test out the code.
Read Why Adopt Abseil to understand our design philosophy.
Peruse our Abseil Compatibility Guidelines to understand both what we promise to you, and what we expect of you in return.