InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now. Learn more →
Top 12 C++ Hashmap Projects
-
-
JetBrains
Tell us how you use coding tools. You may win a prize! Are you a developer or a data analyst? Share your thoughts about your coding tools in our short survey and get a chance to win prizes!
-
ExcaliburHash
Excalibur Hash is a high-speed hash map and hash set, ideal for performance-critical uses like video games
-
komihash
Very fast, high-quality hash function, discrete-incremental and streamed hashing-capable (non-cryptographic, inline C/C++) 27GB/s + PRNG
-
-
-
-
InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
-
seq
The seq library is a collection of original C++14 STL-like containers and related tools (by Thermadiag)
-
fph-table
Flash Perfect Hash Table: an implementation of a dynamic perfect hash table, extremely fast for lookup
-
a5hash
Ultra fast, high-quality hash function for hash-tables and hash-maps (non-cryptographic, inline C/C++) + PRNG
Project mention: "Ultimatively" fast, high-quality hash function for hash-tables and hash-maps | news.ycombinator.com | 2025-03-29 -
-
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C++ Hashmap discussion
C++ Hashmap related posts
-
Inside boost::concurrent_flat_map
-
What library are you using for debouncing buttons and switches?
-
Boost 1.81 will have boost::unordered_flat_map...
-
martinus/unordered_dense v1.4.0: A fast & densely stored hashmap, Now with heterogeneous overloads
-
Comprehensive C++ Hashmap Benchmarks 2022
-
It is now trivial to cache pure functions with highly efficient, concurrent cache.
-
Updating map_benchmarks: Send your hashmaps!
-
A note from our sponsor - InfluxDB
www.influxdata.com | 31 Aug 2025
Index
What are some of the best open-source Hashmap projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | sparsepp | 1,287 |
| 2 | cuCollections | 572 |
| 3 | ExcaliburHash | 330 |
| 4 | komihash | 250 |
| 5 | eternal | 215 |
| 6 | gtl | 214 |
| 7 | HashMap | 205 |
| 8 | seq | 90 |
| 9 | fph-table | 45 |
| 10 | a5hash | 26 |
| 11 | qc-hash | 11 |
| 12 | htcw_data | 1 |
Sponsored
Tell us how you use coding tools. You may win a prize!
Are you a developer or a data analyst? Share your thoughts about your coding tools in our short survey and get a chance to win prizes!
surveys.jetbrains.com