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

• introduction
• references
  • enum
  • flat_map
  • flat_set
  • flat_multimap
  • flat_multiset
  • tied_sequence

• 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

• Flat Contianers (P0038R0)
• Why you shouldn't use set (and what you should use instead)