boost-ext/sml

Health v2 · maintenance only

Adoption not part of the score

1392 stars · 203 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Boost::ext.SML is a C++14 one-header-only state machine library with no dependencies, providing a UML-compliant transition table DSL (src_state + event [guard] / action = dst_state). It is designed for fast compilation, small binaries, and scalable use in large projects as an alternative to Boost.MSM eUML.

Use cases

• implement a finite state machine in C++
• replace spaghetti conditional logic with a state machine
• model protocol state transitions like TCP connection handling
• define UML-compliant state machines with guards and actions
• add a lightweight header-only FSM to an embedded or large-scale C++ project

When to choose

• you need a fast-compiling, dependency-free C++ state machine library
• you want a UML-compliant transition table DSL without macros
• you want to pass dependencies to states/actions via constructor injection
• you need O(1) event processing with low memory overhead

When to avoid

• you need runtime-defined or dynamically reconfigurable state machines
• you require Boost.MSM's full feature set or data stored in states
• your project targets a language other than C++14 or later

Facets

library · maturity stable

state-management developer-tools developer-tools programming-languages cpp cross-platform state-machine header-only cpp14 metaprogramming uml fsm boost-ext algorithms

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