Tessil/robin-map

Health v2 · maintenance only

Adoption not part of the score

1503 stars · 146 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

robin-map is a header-only C++ library providing fast hash map and hash set containers (tsl::robin_map, tsl::robin_set, plus prime-growth variants) built on open addressing with robin hood hashing and backward shift deletion. It serves as a high-performance alternative to std::unordered_map, with heterogeneous lookup, move-only key support, optional stored hashes, and serialization support.

Use cases

• fast hash map in C++
• faster alternative to std::unordered_map
• header-only hash set library
• robin hood hashing implementation
• C++ hash table with heterogeneous lookup for pointer-like keys
• hash map that tolerates a poor hash function
• hash map supporting move-only non-default-constructible keys

When to choose

• std::unordered_map is a profiling bottleneck and you need a faster in-memory hash map or set
• You want a zero-build header-only container that drops into any C++ project or CMake build
• You need heterogeneous find, move-only keys, stored-hash lookups, or efficient container serialization

When to avoid

• You need an ordered or sorted associative container with stable iteration order
• You need a concurrent, thread-safe hash table for shared use across threads
• You need a persistent or disk-backed key-value store rather than an in-memory container

Facets

library · maturity stable

serialization developer-tools developer-tools cpp cross-platform hash-map hash-set hash-table data-structures robin-hood-hashing open-addressing header-only containers std-unordered_map-alternative cmake algorithms

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