Add GameSubgame class and subgame API#919
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…s with no child subgames; add Game.terminal_subgames property
Replace the linear contains() scan over m_subgames with a hash lookup of m_subgameCache
d-kad
added
c++
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Issues closed by this PR
GameSubgameRepin C++/GameSubgamein Python #585Description of the changes in this PR
Adds
GameSubgameRep(C++) andSubgame(Python), a first-class object representing a subgame, building on the subgame-root detection (#584).On
Subgame:.root,.parent,.children, and.difference(infosets in this subgame but not in any of its child subgames).On
Game:.subgames(in postorder) and.minimal_subgame(infoset)(returns the smallestSubgamecontaining a given infoset).Parent/child relations live on the
Subgameobject rather than onGameRep, for consistency withnode.parent,infoset.player, etc.; collection-level queries stay onGame.The subgame caches (postorder vector
m_subgamePostorder+ by-root lookup mapm_subgameByRoot) are merged into a privateSubgameDatastruct with a validity flag.m_subgameByRootmakesIsSubgameRoot()O(1) -- closes an old TODO.Not implemented:
GetInfosets(subgame, player)from the description of #585 —differenceis the closest piece (unfiltered by player) — will be shipped separately as this PR is pretty big already.Supersedes #909