stlab libraries

Modern, modular C++ algorithms and data structures. Source and issues on GitHub.

Latest Release: v2.4.0

Released: Oct 13, 2026
Sources: changes | zipball | tarball
Changes:

Expanded coroutine support and generic resume_on support for awaitables.
DLL-safe shared executor ABI and core-ABI system timers, including threadless Emscripten support.
Execution primitives extracted into the standalone stlab-execution dependency, consumed through CPM.
Doxygen documentation improvements and fixes for headers and forest::child_iterator construction.

Resolve the failed documentation-site build for the release commit: https://github.com/stlab/stlab/actions/runs/38341087303 (the deployment job was skipped).

Enhance coroutine support in future<> and update README by @sean-parent in https://github.com/stlab/stlab/pull/592
Implement generic resume_on support for awaitables in future<> by @sean-parent in https://github.com/stlab/stlab/pull/594
fix: Add the missing header file by @apocelipes in https://github.com/stlab/stlab/pull/597
Add Doxygen support and enhance documentation across the project by @sean-parent in https://github.com/stlab/stlab/pull/599
forest: fix child_iterator constructor argument by @purpleKarrot in https://github.com/stlab/stlab/pull/595
Add DLL-safe shared executor ABI by @sean-parent in https://github.com/stlab/stlab/pull/604
Move system timers into core ABI and add threadless Emscripten by @sean-parent in https://github.com/stlab/stlab/pull/605
Mark coroutine test await_ready helpers nodiscard by @sean-parent in https://github.com/stlab/stlab/pull/606
Extract standalone stlab-execution and consume it through CPM by @sean-parent in https://github.com/stlab/stlab/pull/607

@apocelipes made their first contribution in https://github.com/stlab/stlab/pull/597
@purpleKarrot made their first contribution in https://github.com/stlab/stlab/pull/595

Full Changelog: https://github.com/stlab/stlab/compare/v2.3.0…v2.4.0

For older releases, the full list is available on GitHub.

Dec 1, 2020

Forest: An Introduction

Hierarchies. Everyone uses them, so why are they difficult to maintain? In this article we explore forest, a data structure that makes hierarchies self-maintainable, so you can go back to thinking about the data they contain.
Dec 23, 2017

Small Object Optimization for Polymorphic Types

At Meeting C++ 2017 I presented a lightning talk Polymorphic Task Template in Ten which showed an easy way to implement a polymorphic task template, similar to std::function, with a small object optimization in 10 minutes.

Unfortunately, the small object optimization, as described, leads to undefined behavior. As a general rule, you cannot store an object of one type in memory and read it back as another, even if the other type is the objects base class (there are exceptions to this rule, but they do not apply to this situation).

This tip looks at the details of the issue and describes a solution which turns out to be more efficient although it does require slightly more, and more complex, code to implement. A small object optimization for polymorphic types is a very useful construct so it important to understand how it can be done correctly.
May 11, 2017

New Concurrency Library

A new concurrency library was added as a first one to this new stlab instance.

This library provides an alternative to the C++11/14 and upcoming C++17 TS futures. As well it provides an implementation of channels that allow the creation of process graphs.