support bazel complie this project and format code.

learn_class/modern_cpp_30/SFINAE/sfinae paper/overload2.cpp

@@ -0,0 +1,20 @@
+//
+// Created by light on 20-1-6.
+//
+#include <iostream>
+
+std::string f(...) // Variadic functions are so "untyped" that...
+{
+    return "...";
+}
+
+template<typename T>
+std::string f(const T &t)// ...this templated function got the precedence!
+{
+
+    return "T";
+}
+
+int main() {
+    std::cout << f<int>(1) << std::endl;
+}