match(it): A lightweight single-header pattern-matching library for C++17 with macro-free APIs.
C++11/14/17 std::optional with functional-style extensions and reference support
The main features of tartanllama/optional are: Standard Library Extensions.
Open-source alternatives to tartanllama/optional include: boostorg/leaf — Lightweight Error Augmentation Framework. boostorg/mp11 — C++11 metaprogramming library. bowenfu/matchit.cpp — match(it): A lightweight single-header pattern-matching library for C++17 with macro-free APIs. cor3ntin/rangesnext — ranges features for c+23 ported to C++20. dave-hagedorn/cpp-typelist — Use - Moving types in and out of a typelist - Modifying a typelist - anyof, allof, noneof - findif - filter - contains… boostorg/hana — Your standard library for metaprogramming.