immer ☆

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Description:
Library of persistent and immutable data structures written in C++

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: c++ immutable data-structures functional-programming library

Install: brew install immer

About:
Immer is a C++ library that provides persistent and immutable data structures, enabling efficient state management through structural sharing. It allows modifications to create new versions of data structures while reusing unchanged parts, minimizing memory overhead. This approach is ideal for functional programming patterns, concurrent applications, and scenarios requiring efficient snapshots of state.

Key Features:

Structural sharing for memory efficiency
Functional programming paradigm support
High-performance operations (often O(log n))
Thread-safe immutable data structures
Header-only library

Use Cases:

State management in functional C++ applications
Concurrent programming without locks
Undo/redo functionality in software
Game development for snapshotting game state

Alternatives:

Boost.Immutable – Part of Boost libraries; Immer is often considered more modern and performant for specific functional use cases.

Version History

Detected	Version	Rev	Change	Commit
Oct 27, 2024 3:46pm		0	VERSION_BUMP	39817c0e