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Detach the state when copying a position

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In Position we store a pointer to a StateInfo record
kept outside of the Position object.

When copying a position we copy also that pointer so
after the copy we have two Position objects pointing
to the same StateInfo record. This can be dangerous
so fix by copying also the StateInfo record inside
the new Position object and let the new st pointer
point to it. This completely detach the copied
Position from the original one.

Also rename setStartState() as saveState() and clean up
the API to state more clearly what the function does.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-05-29 17:23:21 +02:00
parent bafb9f1a25
commit 5b1316f7bb
3 changed files with 13 additions and 11 deletions
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6
src/position.h
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@@ -138,8 +138,8 @@ public:
void print(Move m = MOVE_NONE) const;
// Copying
void copy(const Position &pos);
void flipped_copy(const Position &pos);
void copy(const Position& pos);
void flipped_copy(const Position& pos);
// The piece on a given square
Piece piece_on(Square s) const;
@@ -250,7 +250,7 @@ public:
bool square_is_weak(Square s, Color c) const;
// Doing and undoing moves
void setStartState(const StateInfo& st);
void saveState();
void do_move(Move m, StateInfo& st);
void do_move(Move m, StateInfo& st, Bitboard dcCandidates);
void undo_move(Move m);