Crate pns

See [README.md]

Structs

FireState	A temporary object for selecting a transition to fire.
Net	A type representing a petri net. It only stores the initial state, not the state used for simulatoin.
Node	A node of a petri net; stores the indices to the next and previous nodes.
SimulatedNet	A wrapper type for net to support managing multiple states for simulations.
State	The state of the petri net used for simulation.