class FSM::Builder(T)

• FSM::Builder(T)
• Reference
• Object

Overview

The machine-scoped builder yielded by Machine(T).build.

#state infers T from the enclosing builder, so T is named once per machine. A partially-built StateDefinition never escapes the block as a loose local: the builder registers it internally and seals it at the end of the block, which is what closes the window in which a caller could hold an unsealed state. At the end of the block finish validates every transition target, seals every definition, and returns the immutable machine.

No two states share an id: registering a second state with an already-registered id raises DuplicateStateError at that #state call rather than silently overwriting the first definition and discarding its transitions.

Defined in:

fsm/builder.cr

Constructors

• .new(id : String)

Instance Method Summary

• #state(id : String, &) : StateDefinition(T)

  Register a state, yielding its definition so transitions and callbacks can be attached.

Constructor Detail

Instance Method Detail