flat_map is a header only associative container library that constructed on linear container. It compliants C++17/20 standard associative container requirements except complexity and interator/reference invalidation.
- Fully C++17 conformant compiler and standard library
- A standard flat_map (note: proposal, P0429R9)
- Boost.Container - flat_(multi)map/set associative containers
- ETL flat_map / flat_multimap flat_set / flat_multiset
- chromium base/containers library