support bazel complie this project and format code.

cpp2.0/cpp11/variadic/variadic6.cpp

@@ -0,0 +1,52 @@
+//
+// Created by light on 19-11-4.
+//
+
+#include <iostream>
+
+
+using namespace std;
+// 上一个例子:variadic5.cpp为递归调用
+// 当前这个例子为递归继承
+namespace light {
+    template<typename...Values>
+    class tuple;
+
+    template<>
+    class tuple<> {
+    };
+
+    template<typename Head, typename...Tail>
+    class tuple<Head, Tail...> : private tuple<Tail...> {
+        typedef tuple<Tail...> inherited;
+    protected:
+        Head m_head;
+    public:
+        tuple() {}
+
+        tuple(Head h, Tail...tail) : m_head(h), inherited(tail...) {}
+
+        // decltype()中的m_head必须放到前面,否则编译器找不到
+        auto head() -> decltype(m_head) { return m_head; }
+        // 或者 Head head()  { return m_head; }
+
+        inherited &tail() { return *this; }
+    };
+}
+/**
+ * string 32   8字节对齐
+ * float  4
+ * int    4
+ * 4+4+32=40 自底向上
+ */
+
+int main() {
+    using light::tuple;
+    tuple<int, float, string> t(41, 6.3, "nico");
+    cout << sizeof(t) << endl;
+    cout << t.head() << endl;
+    cout << t.tail().head() << endl;
+    cout << t.tail().tail().head() << endl;
+
+    return 0;
+}