support bazel complie this project and format code.

concurrency/concurrency_v1/chapter2/2.2_transfer.cpp

@@ -11,7 +11,10 @@ public:
     void do_length_work() {};
 };
 
-void process_big_object(std::unique_ptr<X>);
+void process_big_object(std::unique_ptr<X>)
+{
+    // TODO
+}
 
 int main() {
     X my_x;

concurrency/concurrency_v1/chapter2/2.3_ownership.cpp

@@ -6,6 +6,7 @@
 #include <unistd.h>
 #include <vector>
 #include <algorithm>
+#include <functional>
 
 using namespace std;
 

concurrency/concurrency_v1/chapter2/2.4_runtime.cpp

@@ -6,6 +6,7 @@
 #include <thread>
 #include <vector>
 #include <numeric>
+#include <functional>
 
 using namespace std;
 

concurrency/concurrency_v1/chapter2/BUILD

@@ -0,0 +1,30 @@
+# please run `bazel run //concurrency/concurrency_v1/chapter2:2.4_runtime`
+# please run `bazel run //concurrency/concurrency_v1/chapter2:2.1_basic`
+# please run `bazel run //concurrency/concurrency_v1/chapter2:2.3_ownership`
+# please run `bazel run //concurrency/concurrency_v1/chapter2:2_5_id`
+# please run `bazel run //concurrency/concurrency_v1/chapter2:2.2_transfer`
+
+load("@rules_cc//cc:defs.bzl", "cc_binary")
+
+cc_binary(
+    name = "2.4_runtime",
+    srcs = ["2.4_runtime.cpp"],
+)
+cc_binary(
+    name = "2.1_basic",
+    srcs = ["2.1_basic.cpp"],
+)
+cc_binary(
+    name = "2.3_ownership",
+    srcs = ["2.3_ownership.cpp"],
+)
+cc_binary(
+    name = "2_5_id",
+    srcs = ["2_5_id.cpp"],
+    copts = ["-std=c++11"]
+)
+cc_binary(
+    name = "2.2_transfer",
+    srcs = ["2.2_transfer.cpp"],
+    copts = ["-std=c++11"]
+)