add original source

source/listing_2.3.cpp

@@ -0,0 +1,58 @@
+#include <thread>
+
+class thread_guard
+{
+    std::thread& t;
+public:
+    explicit thread_guard(std::thread& t_):
+        t(t_)
+    {}
+    ~thread_guard()
+    {
+        if(t.joinable())
+        {
+            t.join();
+        }
+    }
+    thread_guard(thread_guard const&)=delete;
+    thread_guard& operator=(thread_guard const&)=delete;
+};
+
+void do_something(int& i)
+{
+    ++i;
+}
+
+struct func
+{
+    int& i;
+
+    func(int& i_):i(i_){}
+
+    void operator()()
+    {
+        for(unsigned j=0;j<1000000;++j)
+        {
+            do_something(i);
+        }
+    }
+};
+
+void do_something_in_current_thread()
+{}
+
+
+void f()
+{
+    int some_local_state;
+    func my_func(some_local_state);
+    std::thread t(my_func);
+    thread_guard g(t);
+        
+    do_something_in_current_thread();
+}
+
+int main()
+{
+    f();
+}