single-file topic
magic_enum
Static reflection for enums (to string, from string, iteration) for modern C++, work with any enum type without any macro or boilerplate code
nameof
Nameof operator for modern C++, simply obtain the name of a variable, type, function, macro, and enum
scope_guard
Scope Guard & Defer C++
semver
Semantic Versioning for modern C++
robin-hood-hashing
Fast & memory efficient hashtable based on robin hood hashing for C++11/14/17/20
flex-table-card
Highly Flexible Lovelace Card - arbitrary contents/columns/rows, regex matched, perfect to show appdaemon created content and anything breaking out of the entity_id + attributes concept
doctest
The fastest feature-rich C++11/14/17/20/23 single-header testing framework
tomlplusplus
Header-only TOML config file parser and serializer for C++17.
gsl-lite
gsl-lite – A single-file header-only version of ISO C++ Guidelines Support Library (GSL) for C++98, C++11, and later
ApprovalTests.cpp
Native ApprovalTests for C++ on Linux, Mac and Windows