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Convert also undo_null_move() to avoid passing UndoInfo object

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No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-02-22 18:03:23 +01:00
parent 9b257ba29d
commit 2f21ec39ad
3 changed files with 13 additions and 9 deletions
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18
src/position.cpp
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@ -1445,10 +1445,12 @@ void Position::do_null_move(UndoInfo& u) {
assert(!is_check());
// Back up the information necessary to undo the null move to the supplied
// UndoInfo object. In the case of a null move, the only thing we need to
// UndoInfo object. In the case of a null move, the only thing we need to
// remember is the last move made and the en passant square.
u.lastMove = lastMove;
u.epSquare = epSquare;
u.previous = previous;
previous = &u;
// Save the current key to the history[] array, in order to be able to
// detect repetition draws.
@ -1473,18 +1475,20 @@ void Position::do_null_move(UndoInfo& u) {
/// Position::undo_null_move() unmakes a "null move".
void Position::undo_null_move(const UndoInfo &u) {
void Position::undo_null_move() {
assert(is_ok());
assert(!is_check());
// Restore information from the supplied UndoInfo object:
lastMove = u.lastMove;
epSquare = u.epSquare;
// Restore information from the our UndoInfo object
lastMove = previous->lastMove;
epSquare = previous->epSquare;
previous = previous->previous;
if (epSquare != SQ_NONE)
key ^= zobEp[epSquare];
// Update the necessary information.
// Update the necessary information
sideToMove = opposite_color(sideToMove);
rule50--;
gamePly--;
@ -1942,7 +1946,7 @@ bool Position::has_mate_threat(Color c) {
// Undo null move, if necessary
if (c != stm)
undo_null_move(u1);
undo_null_move();
return result;
}

2
src/position.h
View file

@ -244,7 +244,7 @@ public:
void do_move(Move m, UndoInfo &u);
void undo_move(Move m);
void do_null_move(UndoInfo &u);
void undo_null_move(const UndoInfo &u);
void undo_null_move();
// Static exchange evaluation
int see(Square from, Square to) const;

2
src/search.cpp
View file

@ -1201,7 +1201,7 @@ namespace {
&& pos.see(ss[ply + 1].currentMove) + nullValue >= beta)
nullDrivenIID = true;
pos.undo_null_move(u);
pos.undo_null_move();
if (value_is_mate(nullValue))
{