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Use std::deque to store setup states

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This commit is contained in:
Marco Costalba 2012-08-26 18:07:54 +02:00
parent 16f380e5c1
commit 8991a6f005
1 changed files with 12 additions and 14 deletions
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26
src/uci.cpp
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@ -17,6 +17,7 @@
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <deque>
#include <iostream>
#include <sstream>
#include <string>
@ -38,11 +39,6 @@ namespace {
// FEN string of the initial position, normal chess
const char* StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
// Keep track of position keys along the setup moves (from start position to the
// position just before to start searching). This is needed by draw detection
// where, due to 50 moves rule, we need to check at most 100 plies back.
StateInfo StateRingBuf[102], *SetupState = StateRingBuf;
void set_option(istringstream& up);
void set_position(Position& pos, istringstream& up);
void go(Position& pos, istringstream& up);
@ -152,13 +148,17 @@ void UCI::loop(const string& args) {
namespace {
// set_position() is called when engine receives the "position" UCI
// command. The function sets up the position described in the given
// fen string ("fen") or the starting position ("startpos") and then
// makes the moves given in the following move list ("moves").
// set_position() is called when engine receives the "position" UCI command.
// The function sets up the position described in the given fen string ("fen")
// or the starting position ("startpos") and then makes the moves given in the
// following move list ("moves").
void set_position(Position& pos, istringstream& is) {
// Keep track of position keys along the setup moves (from start position to the
// position just before to start searching). Needed by repetition draw detection.
static std::deque<StateInfo> st;
Move m;
string token, fen;
@ -176,15 +176,13 @@ namespace {
return;
pos.from_fen(fen, Options["UCI_Chess960"], Threads.main_thread());
st.clear();
// Parse move list (if any)
while (is >> token && (m = move_from_uci(pos, token)) != MOVE_NONE)
{
pos.do_move(m, *SetupState);
// Increment pointer to StateRingBuf circular buffer
if (++SetupState - StateRingBuf >= 102)
SetupState = StateRingBuf;
st.push_back(StateInfo());
pos.do_move(m, st.back());
}
}