Awesome Open Source
Awesome Open Source


A lightweight error handling library for C++11.



  • Small single-header format, no dependencies.
  • Designed for maximum efficiency ("happy" path and "sad" path).
  • No dynamic memory allocations, even with heavy payloads.
  • O(1) transport of arbitrary error types (independent of call stack depth).
  • Can be used with or without exception handling.
  • Support for multi-thread programming.



Besides GitHub, there are two other distribution channels:

  • LEAF is included in official Boost releases, starting with Boost 1.75.
  • For maximum portability, the library is also available in single-header format: simply download leaf.hpp (direct download link).

Copyright (C) 2018-2021 Emil Dotchevski. Distributed under the[Boost Software License, Version 1.0].

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