X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fendgame.cpp;h=19c5b0b8c6c45c97d89d5538095ed447680c8c15;hb=3c675db3d0c2ddf41036c3481f0891d208d4b6f5;hp=8280131753b859ea1ea784230eb1abde1c23f7d8;hpb=14df99130f53a2a5f57260eb830b4c0029bd4e99;p=stockfish
diff --git a/src/endgame.cpp b/src/endgame.cpp
index 82801317..19c5b0b8 100644
--- a/src/endgame.cpp
+++ b/src/endgame.cpp
@@ -1,7 +1,7 @@
/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+ Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -17,8 +17,8 @@
along with this program. If not, see .
*/
-#include
#include
+#include
#include "bitcount.h"
#include "endgame.h"
@@ -60,43 +60,33 @@ namespace {
// the two kings in basic endgames.
const int DistanceBonus[8] = { 0, 0, 100, 80, 60, 40, 20, 10 };
- // Build corresponding key code for the opposite color: "KBPKN" -> "KNKBP"
- const string swap_colors(const string& keyCode) {
-
- size_t idx = keyCode.find('K', 1);
- return keyCode.substr(idx) + keyCode.substr(0, idx);
- }
-
- // Get the material key of a position out of the given endgame key code
- // like "KBPKN". The trick here is to first build up a FEN string and then
- // let a Position object to do the work for us. Note that the FEN string
- // could correspond to an illegal position.
- Key mat_key(const string& keyCode) {
+ // Get the material key of a Position out of the given endgame key code
+ // like "KBPKN". The trick here is to first forge an ad-hoc fen string
+ // and then let a Position object to do the work for us. Note that the
+ // fen string could correspond to an illegal position.
+ Key key(const string& code, Color c) {
- assert(keyCode.length() > 0 && keyCode.length() < 8);
- assert(keyCode[0] == 'K');
+ assert(code.length() > 0 && code.length() < 8);
+ assert(code[0] == 'K');
- string fen;
- size_t i = 0;
+ string sides[] = { code.substr(code.find('K', 1)), // Weaker
+ code.substr(0, code.find('K', 1)) }; // Stronger
- // First add white and then black pieces
- do fen += keyCode[i]; while (keyCode[++i] != 'K');
- do fen += char(tolower(keyCode[i])); while (++i < keyCode.length());
+ transform(sides[c].begin(), sides[c].end(), sides[c].begin(), tolower);
- // Add file padding and remaining empty ranks
- fen += string(1, '0' + int(8 - keyCode.length())) + "/8/8/8/8/8/8/8 w - - 0 10";
+ string fen = sides[0] + char('0' + int(8 - code.length()))
+ + sides[1] + "/8/8/8/8/8/8/8 w - - 0 10";
- // Build a Position out of the fen string and get its material key
- return Position(fen, false, 0).get_material_key();
+ return Position(fen, false, 0).material_key();
}
-} // namespace
+ template
+ void delete_endgame(const typename M::value_type& p) { delete p.second; }
+} // namespace
-/// Endgames member definitions
-template<> const Endgames::M1& Endgames::map() const { return m1; }
-template<> const Endgames::M2& Endgames::map() const { return m2; }
+/// Endgames members definitions
Endgames::Endgames() {
@@ -119,21 +109,17 @@ Endgames::Endgames() {
Endgames::~Endgames() {
- for (M1::const_iterator it = m1.begin(); it != m1.end(); ++it)
- delete it->second;
-
- for (M2::const_iterator it = m2.begin(); it != m2.end(); ++it)
- delete it->second;
+ for_each(m1.begin(), m1.end(), delete_endgame);
+ for_each(m2.begin(), m2.end(), delete_endgame);
}
template
-void Endgames::add(const string& keyCode) {
+void Endgames::add(const string& code) {
typedef typename eg_family::type T;
- typedef typename Map::type M;
- const_cast(map()).insert(std::make_pair(mat_key(keyCode), new Endgame(WHITE)));
- const_cast(map()).insert(std::make_pair(mat_key(swap_colors(keyCode)), new Endgame(BLACK)));
+ map((T*)0)[key(code, WHITE)] = new Endgame(WHITE);
+ map((T*)0)[key(code, BLACK)] = new Endgame(BLACK);
}
@@ -383,7 +369,7 @@ Value Endgame::operator()(const Position& pos) const {
result += Value(square_distance(bksq, nsq) * 32);
// Bonus for restricting the knight's mobility
- result += Value((8 - count_1s(pos.attacks_from(nsq))) * 8);
+ result += Value((8 - popcount(pos.attacks_from(nsq))) * 8);
return strongerSide == pos.side_to_move() ? result : -result;
}