tl-expected ☆

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Description:
C++11/14/17 std::expected with functional-style extensions

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: c++ error-handling library functional header-only

Install: brew install tl-expected

About:
Tl::Expected is a C++11/14/17 library implementation of the std::expected idiom, designed for error handling without exceptions. It provides a type that either contains a value or an error, enabling expressive and safe functional-style error propagation. The library includes extensions beyond the standard proposal, such as support for unexpected types and monadic operations.

Key Features:

C++11/14/17 compatible implementation
Monadic operations for error handling (and_then, transform, or_else)
No exceptions or dynamic memory allocation required
Header-only library for easy integration

Use Cases:

Error handling in performance-critical or embedded C++ applications
Refactoring legacy codebases to use modern, exception-free error propagation
Functional-style programming in C++ for better code readability and safety

Alternatives:

std::expected (C++23) – Standard library version requires C++23; tl::expected provides backward compatibility and additional extensions.
Boost.Outcome – Heavier dependency with broader features; tl::expected is lighter and header-only.

Version History

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