revision #1: 更新第二章中已维护的代码

code/2/2.11.for.loop.cpp

@@ -0,0 +1,23 @@
+//
+// 2.11.for.loop.cpp
+// chapter 2 language usability
+// modern cpp tutorial
+//
+// created by changkun at changkun.de
+//
+
+#include <iostream>
+#include <vector>
+#include <algorithm>
+
+int main() {
+    std::vector<int> vec = {1, 2, 3, 4};
+    if (auto itr = std::find(vec.begin(), vec.end(), 3); itr != vec.end()) *itr = 4;
+    for (auto element : vec)
+        std::cout << element << std::endl; // read only
+    for (auto &element : vec) {
+        element += 1;                      // writeable
+    }
+    for (auto element : vec)
+        std::cout << element << std::endl; // read only
+}