ocaml-containers
A modular, lightweight extension of OCaml's standard library focused on data structures, combinators, and iterators.
What is ocaml-containers?
OCaml-containers is a lightweight, modular extension of the OCaml standard library that provides additional data structures, safe combinators, and utilities. It solves the problem of missing or unsafe functions in the standard library by offering enhanced modules and independent, dependency-free components.
OCaml developers who need robust, safe extensions to the standard library for data manipulation, functional programming, and building applications with modular components.
Developers choose OCaml-containers for its modular design, safety features like monomorphic operators to prevent bugs, and comprehensive utilities that extend the standard library without introducing unnecessary dependencies.
Overview
A lightweight, modular standard library extension, string library, and interfaces to various libraries (unix, threads, etc.) BSD license.
Use Cases
Best For
- Extending OCaml's standard library with safe and additional functions
- Building applications with functional data structures like vectors and heaps
- Writing resource-safe file I/O operations
- Processing data with iterators and combinators
- Implementing S-expression serialization and parsing
- Developing modular OCaml code with minimal dependencies
Not Ideal For
- Projects stuck on OCaml versions older than 4.03.0
- Teams that require long-term API stability and minimal breaking changes
- Applications preferring a single, monolithic library over modular, dependency-free components
Pros & Cons
Pros
Every module is standalone with a 'CC' prefix, allowing selective use without unnecessary dependencies, as highlighted in the README's design philosophy.
Provides safe versions of functions like CCList.map and defaults to monomorphic operators to prevent bugs from polymorphic comparison, detailed in the migration guide.
Includes functional data structures like vectors and heaps, resource-safe I/O helpers with CCIO, and S-expression support, extending the standard library comprehensively.
Cons
Major updates like 2.0 and 3.0 introduce disruptive breaking changes, such as moving sub-libraries and deprecating functions, requiring code modifications as per migration guides.
Default shadowing of polymorphic operators complicates migration for existing codebases, forcing adaptation or explicit use of Stdlib operators, which can be a hurdle.
Since version 3.0, additional data structures are in the separate containers-data package, adding dependency management complexity and an extra installation step.
Frequently Asked Questions
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