/compile_time_state_machine

C++ State Machine that can execute at compile time

Primary LanguageC++

Compile-Time State Machine

A quite short implementation of a compile-time state machine. Transitions can be triggered externally via the on method or internally, via the update method (see the examples in the examples folder).

NOTE: Requires C++20.

An example of usage taken from examples/explicit_transitions.cpp

    constexpr auto m = builder_t<state_a>::build(1) // Utility builder. Initialize specified state with 1
                           .addTransition(transition_v<event_a, state_a>) // Each call return a new state machine
                           .addTransition(transition_v<event_b, state_b>)
                           .addTransition(transition_v<event_c, state_c>);
    constexpr auto m1 = m.on<event_b>(15); // Return a new state machine with a state initialized with 15
    static_assert(std::is_same_v<std::decay_t<delctype(m1.state())>, state_b>); // Will pass