support bazel complie this project and format code.

learn_class/modern_cpp_30/functionLambda/BUILD

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+# please run `bazel run //learn_class/modern_cpp_30/functionLambda:adder`
+# please run `bazel run //learn_class/modern_cpp_30/functionLambda:function`
+# please run `bazel run //learn_class/modern_cpp_30/functionLambda:autoLambda`
+
+load("@rules_cc//cc:defs.bzl", "cc_binary")
+
+cc_binary(
+    name = "adder",
+    srcs = ["adder.cpp"],
+    copts = ["-std=c++17"],
+)
+cc_binary(
+    name = "function",
+    srcs = ["function.cpp"],
+    copts = ["-std=c++17"],
+)
+cc_binary(
+    name = "autoLambda",
+    srcs = ["autoLambda.cpp"],
+    copts = ["-std=c++17"],
+)

learn_class/modern_cpp_30/functionLambda/adder.cpp

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+//
+// Created by light on 20-1-11.
+//
+#include <iostream>
+
+using namespace std;
+
+struct adder {
+  adder(int n) : n_(n) {}
+
+  int operator()(int x) const { return x + n_; }
+
+private:
+  int n_;
+};
+
+int main() {
+  auto add_2 = adder(2);
+
+  // x+2
+  cout << add_2(3) << endl;
+
+  auto t = bind1st(plus<int>(), 2);
+  cout << t(1) << endl;
+  // 上述的C++98
+  binder2nd<plus<int>> a2(plus<int>(), 2);
+  cout << a2(3) << endl;
+
+  cout << [](int x) { return x * x; }(3) << endl;
+  return 0;
+  // lambda表达式默认就是constexpr函数
+}

learn_class/modern_cpp_30/functionLambda/autoLambda.cpp

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+//
+// Created by light on 20-1-11.
+//
+
+#include <chrono>
+#include <iostream>
+#include <sstream>
+#include <thread>
+
+using namespace std;
+
+int get_count() {
+  static int count = 0;
+  return ++count;
+}
+
+class task {
+public:
+  task(int data) : data_(data) {}
+
+  /**
+   * this 标明按引用捕获外围对象（针对 lambda
+   * 表达式定义出现在一个非静态类成员内的情况）； 注意默认捕获符 = 和 &
+   * 号可以自动捕获 this（并且在 C++20 之前，在 = 后写 this 会导致出错）
+   * 本例子两次都按照第二次输出(this_thread::sleep_for(100ms);
+   * this 标明按引用捕获外围对象
+   *
+   *
+   * *this 标明按值捕获外围对象（针对 lambda
+   * 表达式定义出现在一个非静态类成员内的情况；C++17 新增语法） 本例子正常输出
+   */
+  auto lazy_launch() {
+    return [*this, count = get_count()]() mutable {
+      ostringstream oss;
+      oss << "Done work " << data_ << " (No. " << count << ") in thread "
+          << this_thread::get_id() << '\n';
+      msg_ = oss.str();
+      calculate();
+    };
+  }
+
+  void calculate() {
+    this_thread::sleep_for(100ms);
+    cout << msg_;
+  }
+
+private:
+  int data_;
+  string msg_;
+};
+
+int main() {
+  auto t = task{37};
+  thread t1{t.lazy_launch()};
+  thread t2{t.lazy_launch()};
+  t1.join();
+  t2.join();
+}

learn_class/modern_cpp_30/functionLambda/function.cpp

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+//
+// 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; }},
+  };
+}