support bazel complie this project and format code.

learn_class/modern_cpp_30/functionLambda/function.cpp

@@ -0,0 +1,19 @@
+//
+// Created by light on 20-1-11.
+//
+
+#include <functional>
+#include <iostream>
+#include <map>
+
+using namespace std;
+
+int main() {
+
+  map<string, function<int(int, int)>> op_dict{
+      {"+", [](int x, int y) { return x + y; }},
+      {"-", [](int x, int y) { return x - y; }},
+      {"*", [](int x, int y) { return x * y; }},
+      {"/", [](int x, int y) { return x / y; }},
+  };
+}