prepare for c++17

code/4/4.1.cpp

@@ -0,0 +1,35 @@
+//
+// 4.1.cpp
+// c++1x tutorial
+//
+// created by changkun at shiyanlou.com
+//
+// std::array
+
+#include <iostream>
+#include <array>
+
+void foo(int *p, int len) {
+    for (int i = 0; i != len; ++i) {
+        std::cout << p[i] << std::endl;
+    }
+}
+
+int main() {
+    std::array<int, 4> arr= {1,4,3,2};
+    
+    //int len = 4;
+    //std::array<int, len> arr = {1,2,3,4}; // 非法, 数组大小参数必须是常量表达式
+    
+    // C 风格接口传参
+    // foo(arr, arr.size());           // 非法, 无法隐式转换
+    foo(&arr[0], arr.size());
+    foo(arr.data(), arr.size());
+    
+    // 更多接口使用
+    std::sort(arr.begin(), arr.end());
+    for(auto &i : arr)
+        std::cout << i << std::endl;
+    
+    return 0;
+}