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Introduce StateInfo instead of UndoInfo

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We don't backup anymore but use the renamed StateInfo
argument passed in do_move() to store the new position
state when doing a move.

Backup is now just revert to previous StateInfo that we know
because we store a pointer to it.
Note that now backing store is up to the caller, Position is
stateless in that regard, state is accessed through a pointer.

This patch will let us remove all the backup/restore copying,
just a pointer switch is now necessary.

Note that do_null_move() still uses StateInfo as backup.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-02-22 20:16:21 +01:00
parent 2f6c5f00e6
commit 8f59de48f5
6 changed files with 255 additions and 280 deletions
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4
src/tt.cpp
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@@ -177,13 +177,13 @@ void TranspositionTable::new_search() {
void TranspositionTable::insert_pv(const Position &pos, Move pv[]) {
UndoInfo u;
StateInfo st;
Position p(pos);
for (int i = 0; pv[i] != MOVE_NONE; i++)
{
store(p, VALUE_NONE, Depth(0), pv[i], VALUE_TYPE_NONE);
p.do_move(pv[i], u);
p.do_move(pv[i], st);
}
}