support bazel complie this project and format code.

cpp2.0/cpp11/variadic/variadic5.cpp

@@ -0,0 +1,44 @@
+//
+// Created by light on 19-11-4.
+//
+
+#include <iostream>
+#include <tuple>
+#include <bitset>
+
+using namespace std;
+
+// tuple递归调用
+
+// 得出这种打印[7,5....,42]
+// 需要知道有几个以及现在操作的是第几个   sizeof...()
+
+// cout<< make_tuple(7.5,string("hello"),bitset<16>(377),47);
+
+
+template<int IDX, int MAX, typename... Args>
+struct print_tuple {
+    static void print(ostream &os, const tuple<Args...> &t) {
+        os << get<IDX>(t) << (IDX + 1 == MAX ? "" : ",");
+        print_tuple<IDX + 1, MAX, Args...>::print(os, t);
+    }
+};
+
+// 偏特化
+template<int MAX, typename... Args>
+struct print_tuple<MAX, MAX, Args...> {
+    static void print(ostream &os, const tuple<Args...> &t) {
+    }
+};
+
+template<typename ... Args>
+ostream &operator<<(ostream &os, const tuple<Args...> &t) {
+    os << "[";
+    print_tuple<0, sizeof...(Args), Args...>::print(os, t);
+    return os << "]";
+}
+
+
+int main() {
+    cout << make_tuple(7.5, string("hello"), bitset<16>(377), 47) << endl;
+}