Top 21 C++ constexpr Projects

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1. compile-time-regular-expressions

   1 29 3,650 7.5 C++

   Compile Time Regular Expression in C++

   

   Project mention: Show HN: Less Slow C++ | news.ycombinator.com | 2025-04-18

   The problem can occur in general if there is a greedy match within the regex: https://github.com/hanickadot/compile-time-regular-expressio...

   Although it looks like that this got fixed for simple patterns.

2. JetBrains

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3. constexpr-8cc

   2 2 806 3.9 C++

   Compile-time C Compiler implemented as C++14 constant expressions

   

4. gcem

   3 3 776 5.2 C++

   A C++ compile-time math library using generalized constant expressions

   

5. hof

   4 1 511 1.1 C++

   Higher-order functions for c++ (by boostorg)

   

6. daw_json_link

   5 25 498 7.2 C++

   Fast, convenient JSON serialization and parsing in C++

   

7. uni-algo

   6 4 298 8.9 C++

   Unicode Algorithms Implementation for C/C++

   

8. snitch

   7 4 292 7.5 C++

   Lightweight C++20 testing framework. (by snitch-org)

   

9. InfluxDB

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10. cthash

    8 2 226 4.9 C++

    constexpr implementation of SHA-2 and SHA-3 family of hashes

    

11. eternal

    9 1 215 10.0 C++

    A C++14 compile-time/constexpr map and hash map with minimal binary footprint (by mapbox)

    

12. lift

    10 1 198 0.0 C++

    constexpr C++17 library for simplifying higher order functions in application code (by rollbear)

    

13. constexpr-sql

    11 1 141 0.0 C++

    Header only library that parses and plans SQL queries at compile time

    

14. bitpacker

    12 1 123 0.0 C++

    type-safe and low-boilerplate bit level serialization

    

15. bitset2

    13 4 122 2.2 C++

    std::bitset with constexpr implementations plus additional features.

    

16. milo

    14 5 76 4.1 C++

    Cryptography library for modern C++.

    

17. bit_set

    15 1 44 7.7 C++

    Rebooting the std::bitset franchise

    

18. uninttp

    16 1 27 7.3 C++

    A universal type for non-type template parameters for C++20 or later.

    

19. arby

    17 2 8 5.0 C++

    Arbitrary precision arithmetic in C++, even at compile-time

    

20. enumerate

    18 1 7 2.6 C++

    Header-only, single file, C++11 compatible version of `enumerate`. (by hipony)

    

21. ndvec

    19 1 2 8.2 C++

    constexpr n-dimensional Euclidean vector

    

22. constyaml

    20 1 2 0.0 C++

    constexpr (strict)yaml parser

    

23. codlili

    21 1 2 10.0 C++

    Constexpr STL-style containers

    

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C++ constexpr related posts

• Implementing Regular Expressions in TypeScript Types (Badly)

  3 projects | news.ycombinator.com | 20 Oct 2024

• Challenges creatinga lookup table class that instantiates at compile time and is stored in flash.

  1 project | /r/cpp_questions | 19 Jun 2023

• What are thoughts on removing regular expression from the standard library?

  1 project | /r/cpp | 8 Jun 2023

• Long switch statements. Is there a better way?

  2 projects | /r/cpp | 8 Mar 2023

• Verify all characters are same except a few

  1 project | /r/cpp_questions | 9 Mar 2023

• Constexpr regex parser!

  2 projects | /r/cpp | 14 Feb 2023

• Constexpr implementation of SHA-2 and SHA-3 family of hashes

  1 project | /r/u_Sufficient-Dirt4517 | 7 Feb 2023
• A note from our sponsor - Sevalla
  sevalla.com | 1 Sep 2025

  Sevalla is the PaaS you have been looking for! Advanced deployment pipelines, usage-based pricing, preview apps, templates, human support by developers, and much more! Learn more →

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