Get rid of nativeThread

No functional change.

src/endgame.h

@@ -76,7 +76,7 @@ eg_type = typename std::conditional<(E < SCALING_FUNCTIONS), Value, ScaleFactor>
 template<typename T>
 struct EndgameBase {
 
-  virtual ~EndgameBase() {}
+  virtual ~EndgameBase() = default;
   virtual Color strong_side() const = 0;
   virtual T operator()(const Position&) const = 0;
 };

src/thread.cpp

@@ -38,9 +38,9 @@ namespace {
  // when start_routine (and hence virtual idle_loop) is called and when joining.
 
  template<typename T> T* new_thread() {
-   T* th = new T();
-   th->nativeThread = std::thread(&ThreadBase::idle_loop, th); // Will go to sleep
-   return th;
+   std::thread* th = new T;
+   *th = std::thread(&T::idle_loop, (T*)th); // Will go to sleep
+   return (T*)th;
  }
 
  void delete_thread(ThreadBase* th) {
@@ -50,7 +50,7 @@ namespace {
    th->mutex.unlock();
 
    th->notify_one();
-   th->nativeThread.join(); // Wait for thread termination
+   th->join(); // Wait for thread termination
    delete th;
  }
 
@@ -61,7 +61,7 @@ namespace {
 
 void ThreadBase::notify_one() {
 
-  std::unique_lock<Mutex>(this->mutex);
+  std::unique_lock<Mutex> lk(mutex);
   sleepCondition.notify_one();
 }
 

src/thread.h

@@ -89,14 +89,13 @@ struct SplitPoint {
 /// ThreadBase struct is the base of the hierarchy from where we derive all the
 /// specialized thread classes.
 
-struct ThreadBase {
+struct ThreadBase : public std::thread {
 
   virtual ~ThreadBase() = default;
   virtual void idle_loop() = 0;
   void notify_one();
   void wait_for(volatile const bool& b);
 
-  std::thread nativeThread;
   Mutex mutex;
   Spinlock spinlock;
   ConditionVariable sleepCondition;

src/uci.cpp

@@ -68,7 +68,7 @@ namespace {
         return;
 
     pos.set(fen, Options["UCI_Chess960"], Threads.main());
-    SetupStates = Search::StateStackPtr(new std::stack<StateInfo>());
+    SetupStates = Search::StateStackPtr(new std::stack<StateInfo>);
 
     // Parse move list (if any)
     while (is >> token && (m = UCI::to_move(pos, token)) != MOVE_NONE)