support bazel complie this project and format code.

cpp2.0/cpp11/variadic/variadic2.cpp

@@ -0,0 +1,34 @@
+//
+// Created by light on 19-11-4.
+//
+
+#include <iostream>
+
+using namespace std;
+
+void print(const char *s) {
+    while (*s) {
+        if (*s == '%' && *(++s) != '%')
+            throw std::runtime_error("invalid format string: missing arguments");
+        std::cout << *s++;
+    }
+}
+
+template<typename T, typename... Args>
+void print(const char *s, T value, Args... args) {
+    while (*s) {
+        if (*s == '%' && *(++s) != '%') {
+            std::cout << value;
+            print(++s, args...); // 即便当 *s == 0 也会产生调用，以检测更多的类型参数。
+            return;
+        }
+        std::cout << *s++;
+    }
+    throw std::logic_error("extra arguments provided to printf");
+}
+
+int main() {
+    int *pi = new int;
+    print("%d %s %p %f\n", 15, "Acc", pi, 3.14);
+    return 0;
+}