folly

by facebook · Developer Tools

An open-source C++ library developed and used at Facebook.

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Developer ToolsDeveloper ToolC++Starlark
↓ Download v2026.08.31.00GitHub⚑ Report
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About this project

Folly: Facebook Open-source Library What is folly? Folly (an acronym loosely after Facebook Open Source Library) is a library of C++20 components designed with practicality and efficiency in mind. Folly contains a variety of core library components used extensively at Facebook. In particular, it's often a dependency of Facebook's other open source C++ efforts and place where those projects can share code. It complements (as opposed to competing against) offerings such as Boost and of course std. In fact, we embark on defining our own component only when something we need is either not available, or does not meet the needed performance profile. We endeavor to remove things from folly…

Technologies

PythonC++StarlarkRustCMake

Project health

Actively maintained
Last update3 days ago
Contributors279
Latest releasev2026.08.31.00
Open issues & PRs465
LicenseApache-2.0
On GitHubsince 2012

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