revision #1: 更新第二章中已维护的代码

code/2/2.5.structured.binding.cpp

@@ -0,0 +1,20 @@
+//
+// 2.5.structured.binding.cpp
+// chapter 2 language usability
+// modern cpp tutorial
+//
+// created by changkun at changkun.de
+//
+
+#include <iostream>
+#include <string>
+
+std::tuple<int, double, std::string> f() {
+    return std::make_tuple(1, 2.3, "456");
+}
+
+int main() {
+    auto [x, y, z] = f();
+    std::cout << x << ", " << y << ", " << z << std::endl;
+    return 0;
+}