frozen ☆

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Description:
Header-only, constexpr alternative to gperf for C++14 users

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: c++ header-only constexpr hashing performance

Install: brew install frozen

About:
Frozen is a header-only C++14 library providing compile-time perfect hash maps and sets. It enables developers to define static lookup tables that are evaluated entirely during compilation, eliminating runtime initialization overhead. This makes it an ideal, dependency-free alternative to tools like gperf for performance-critical applications.

Key Features:

Compile-time perfect hash generation
Zero runtime initialization cost
C++14 constexpr compatibility
Header-only, no dependencies

Use Cases:

Implementing high-performance keyword lookup tables
Replacing runtime-generated hash maps in embedded systems
Optimizing switch-statement alternatives for large key sets

Alternatives:

gperf – Frozen is a modern C++ header-only library, whereas gperf is a standalone code generator requiring a separate build step.
phmap – Frozen focuses specifically on compile-time perfect hashing, while phmap provides runtime parallel hash maps.

Version History

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