Use emplace_back() and for(a:b) loop.

Author: progschj

example.cpp

@@ -11,18 +11,18 @@ int main()
     std::vector< std::future<int> > results;
 
     for(int i = 0; i < 8; ++i) {
-        results.push_back(
+        results.emplace_back(
             pool.enqueue([i] {
                 std::cout << "hello " << i << std::endl;
                 std::this_thread::sleep_for(std::chrono::seconds(1));
                 std::cout << "world " << i << std::endl;
                 return i*i;
             })
         );
-    }   
-    
-    for(size_t i = 0;i<results.size();++i)
-        std::cout << results[i].get() << ' ';
+    }
+
+    for(auto && result: results)
+        std::cout << result.get() << ' ';
     std::cout << std::endl;
 
     return 0;