Top 20 C++ constexpr Projects

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1. compile-time-regular-expressions

   1 31 3,823 5.7 C++

   Compile Time Regular Expression in C++

   

   Project mention: Is Rust faster than C? | news.ycombinator.com | 2026-01-14

   Other examples are CTRE (https://github.com/hanickadot/compile-time-regular-expressio...) and format string compilation (https://fmt.dev/12.0/api/#compile-api). The closest C counterpart is re2c which also requires external tooling.

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3. gcem

   2 3 832 5.2 C++

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

   

4. constexpr-8cc

   3 2 813 3.9 C++

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

   

5. hof

   4 1 510 0.0 C++

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

   

6. daw_json_link

   5 25 509 7.5 C++

   Fast, convenient JSON serialization and parsing in C++

   

7. uni-algo

   6 4 326 8.9 C++

   Unicode Algorithms Implementation for C/C++

   

8. snitch

   7 5 313 7.1 C++

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

   

   Project mention: Snitch – a friendly netstat alternative for humans | news.ycombinator.com | 2025-12-22

9. cthash

   8 2 238 8.1 C++

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

   

10. lift

    9 1 202 0.0 C++

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

    

11. constexpr-sql

    10 1 143 0.0 C++

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

    

12. bitpacker

    11 1 127 0.0 C++

    type-safe and low-boilerplate bit level serialization

    

13. bitset2

    12 4 127 2.2 C++

    std::bitset with constexpr implementations plus additional features.

    

14. milo

    13 5 78 4.1 C++

    Cryptography library for modern C++.

    

15. bit_set

    14 1 47 6.7 C++

    Rebooting the std::bitset franchise

    

16. static_asm

    15 1 32 8.0 C++

    Header-only C++2x compile-time assembler for x86/x86-64 instruction encoding

    

    Project mention: Show HN: A header-only C++20 compile-time assembler for x86/x64 instructions | news.ycombinator.com | 2026-01-28

17. uninttp

    16 1 28 7.3 C++

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

    

18. arby

    17 2 9 5.0 C++

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

    

19. enumerate

    18 1 7 2.6 C++

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

    

20. constyaml

    19 1 2 0.0 C++

    constexpr (strict)yaml parser

    

21. codlili

    20 1 2 10.0 C++

    Constexpr STL-style containers

    

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
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