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GeezerVison is showing github.com — cppchess_engine/tb.cpp at HandcraftedEngine · winapiadmin/cppchess_engine

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#include "tb.h"
#include <exception>
#include <iostream>
#include <tbprobe.h>
#include <unordered_set>
namespace engine::tb {
tbprobe::syzygy::Tablebase tablebase;
namespace {
std::size_t unique_table_count(const std::unordered_map<std::string, tbprobe::syzygy::Table *> &tables) {
std::unordered_set<const tbprobe::syzygy::Table *> uniqueTables;
for (const auto &[_, table] : tables)
if (table != nullptr)
uniqueTables.insert(table);
return uniqueTables.size();
}
} // namespace
void init(const std::string &path) {
tablebase.close();
if (path.empty()) {
std::cout << "info string Found 0 WDL and 0 DTZ tablebase files\n";
return;
}
try {
tbprobe::syzygy::initialize();
tablebase.add_directory(path, true, true);
std::cout << "info string Found " << wdl_count() << " WDL and " << dtz_count() << " DTZ tablebase files\n";
} catch (const std::exception &e) {
std::cout << "info string Syzygy init failed: " << e.what() << '\n';
}
}
std::size_t wdl_count() { return unique_table_count(tablebase.wdl); }
std::size_t dtz_count() { return unique_table_count(tablebase.dtz); }
int probe_wdl(chess::Position &board) {
try {
return *tablebase.get_wdl(board, TB_ERROR);
} catch (const std::exception &) {
return TB_ERROR;
}
}
int probe_dtz(chess::Position &board) {
try {
return *tablebase.get_dtz(board, TB_ERROR);
} catch (const std::exception &) {
return TB_ERROR;
}
}
} // namespace engine::tb
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