Santa's Toy Factory — Player Persistence

The full persistence model for a tycoon save: a class<final><persistable> holding gold, every factory element's state, the current order, and gift/harvest timestamps, kept in a weak_map(player, player_info) with copy-constructors for safe updates. The canonical pattern for persisting player progress across sessions in UEFN.

From the Santa's Toy Factory Epic starter project (SampleVerse/SantaToyFactory/Persistence/player_info.verse). Epic Games reference Verse, shown for study.

• # This file defines player_info, the collection of persistable information stored for each player.
  # It also contains functions for creating, updating and returning information about a player.
  
  using { /Verse.org/Simulation }
  using { Config }
  using { Verse.Scripts.TimeSystem }
  
  # Maps each player to their persisted information.
  var PlayerInfoMap:weak_map(player, player_info) = map{}
  #var PlayerInfoMap:weak_map(session, player_info) = map{}
  
  # This tracks all persistable information for a player.
  player_info := class<final><persistable>:
  
      # The version of the current player info.
      Version:int = 0
  
      # Latest harvest times of all candy CandyCanes.
      CandyCaneHarvestTimes:[]Verse.Scripts.TimeSystem.date_and_time =  array{Verse.Scripts.TimeSystem.date_and_time{}, Verse.Scripts.TimeSystem.date_and_time{}, Verse.Scripts.TimeSystem.date_and_time{}, Verse.Scripts.TimeSystem.date_and_time{}, Verse.Scripts.TimeSystem.date_and_time{}, Verse.Scripts.TimeSystem.date_and_time{}, Verse.Scripts.TimeSystem.date_and_time{}, Verse.Scripts.TimeSystem.date_and_time{}, Verse.Scripts.TimeSystem.date_and_time{}, Verse.Scripts.TimeSystem.date_and_time{}}