transition_state()

bool MayaFlux::Kakshya::transition_state	(	ProcessingState &	current_state,
		ProcessingState	new_state,
		std::function< void()>	on_transition = nullptr
	)

Perform a state transition for a ProcessingState, with optional callback.

Parameters

current_state	Current state (modified in place).
new_state	State to transition to.
on_transition	Optional callback to invoke on transition.

Returns

True if transition was valid and performed.

Definition at line 56 of file ContainerUtils.cpp.

{
    static const std::unordered_map<ProcessingState, std::unordered_set<ProcessingState>> valid_transitions = {
        { ProcessingState::IDLE, { ProcessingState::READY, ProcessingState::ERROR } },
        { ProcessingState::READY, { ProcessingState::PROCESSING, ProcessingState::IDLE, ProcessingState::ERROR } },
        { ProcessingState::PROCESSING, { ProcessingState::PROCESSED, ProcessingState::ERROR } },
        { ProcessingState::PROCESSED, { ProcessingState::READY, ProcessingState::IDLE } },
        { ProcessingState::ERROR, { ProcessingState::IDLE } },
        { ProcessingState::NEEDS_REMOVAL, { ProcessingState::IDLE } }
    };
    auto it = valid_transitions.find(current_state);
    if (it != valid_transitions.end() && (it->second.count(new_state) != 0U)) {
        current_state = new_state;
        if (on_transition)
            on_transition();
        return true;
    }
    return false;
}

References ERROR, IDLE, NEEDS_REMOVAL, PROCESSED, PROCESSING, and READY.