using std:: mersenne for generating hash keys

nescitus · Jul 18, 2018 · a9473c1 · a9473c1
1 parent d296c91
commit a9473c1
Show file tree

Hide file tree

Showing 3 changed files with 9 additions and 5 deletions.
diff --git a/sources/src/eval_draw.cpp b/sources/src/eval_draw.cpp
@@ -274,6 +274,7 @@ bool cEngine::DifferentBishops(POS *p) {
 
 int cEngine::CheckmateHelper(POS *p) {
 
+	// TODO: make color-agnostic
     int result = 0;
 
     // KQ vs Kx: drive enemy king towards the edge

diff --git a/sources/src/init.cpp b/sources/src/init.cpp
@@ -15,14 +15,17 @@ You should have received a copy of the GNU General Public License along with thi
 If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <random>
+#include <cmath>
+#include <string.h>
 #include "rodent.h"
 
 U64 POS::Random64() {
 
-    static U64 next = 1;
-
-    next = next * 1103515245 + 12345;
-    return next;
+	std::random_device rd;
+	std::mt19937_64 e2(rd());
+	std::uniform_int_distribution<U64> dist(std::llround(std::pow(2, 48)), std::llround(std::pow(2, 62)));
+	return dist(e2);
 }
 
 void POS::Init() { // static init function

diff --git a/sources/src/main.cpp b/sources/src/main.cpp
@@ -42,7 +42,7 @@ sBook MainBook;
 
 void PrintVersion() {
 
-    printf("id name Rodent III 0.256"
+    printf("id name Rodent III 0.257"
 
 #if !(defined(_WIN64) || defined(__x86_64__))
             " 32-bit"