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Avoid copy a Position to get a move's san notation

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In move_to_san() we create by copy a new position just
to detect if move gives check. This could be very costly in
line_to_san() that calls move_to_san() for every move, so
create the position only once and pass a reference to move_to_san()

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-01-25 16:22:50 +01:00
parent c5e71f5150
commit d844a75d2c
3 changed files with 8 additions and 7 deletions
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10
src/san.cpp
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@@ -63,7 +63,7 @@ namespace {
/// that the move is a legal move from the position. The return value is
/// a string containing the move in short algebraic notation.
const string move_to_san(const Position& pos, Move m) {
const string move_to_san(Position& pos, Move m) {
assert(pos.is_ok());
assert(move_is_ok(m));
@@ -123,10 +123,10 @@ const string move_to_san(const Position& pos, Move m) {
// Position::move_is_check doesn't detect all checks (not castling moves,
// promotions and en passant captures).
StateInfo st;
Position p(pos);
p.do_move(m, st);
if (p.is_check())
san += p.is_mate()? "#" : "+";
pos.do_move(m, st);
if (pos.is_check())
san += pos.is_mate() ? "#" : "+";
pos.undo_move(m);
return san;
}