add original source

source/listing_2.7.cpp

@@ -0,0 +1,23 @@
+#include <vector>
+#include <thread>
+#include <algorithm>
+#include <functional>
+
+void do_work(unsigned id)
+{}
+
+void f()
+{
+    std::vector<std::thread> threads;
+    for(unsigned i=0;i<20;++i)
+    {
+        threads.push_back(std::thread(do_work,i));
+    }
+    std::for_each(threads.begin(),threads.end(),
+        std::mem_fn(&std::thread::join));
+}
+
+int main()
+{
+    f();
+}