support bazel complie this project and format code.

basic_content/decltype/BUILD

@@ -0,0 +1,8 @@
+# please run `bazel run basic_content/decltype:decltype`
+load("@rules_cc//cc:defs.bzl", "cc_binary")
+
+cc_binary(
+    name = "decltype",
+    srcs = ["decltype.cpp"],
+    copts = ["-std=c++11"]
+)

basic_content/decltype/decltype.cpp

@@ -1,11 +1,3 @@
-/**
- * @file decltype.cpp
- * @brief g++ -o decltype decltype.cpp -std=c++11
- * @author 光城
- * @version v1
- * @date 2019-08-08
- */
-
 #include <iostream>
 #include <vector>
 using namespace std;
@@ -14,47 +6,42 @@ using namespace std;
  */
 template <typename T>
 
-auto multiply(T x, T y)->decltype(x*y)
-{
-    return x*y;
+auto multiply(T x, T y) -> decltype(x * y) {
+  return x * y;
 }
 
-int main()
-{
-    int nums[] = {1,2,3,4};
-    vector<int> vec(nums,nums+4);
-    vector<int>::iterator it;
+int main() {
+  int nums[] = {1, 2, 3, 4};
+  vector<int> vec(nums, nums + 4);
+  vector<int>::iterator it;
 
-    for(it=vec.begin();it!=vec.end();it++)
-        cout<<*it<<" ";
-    cout<<endl;
+  for (it = vec.begin(); it != vec.end(); it++)
+    cout << *it << " ";
+  cout << endl;
 
+  using nullptr_t = decltype(nullptr);
+  nullptr_t nu;
+  int *p = NULL;
+  if (p == nu)
+    cout << "NULL" << endl;
 
-    using nullptr_t = decltype(nullptr);
-    nullptr_t  nu;
-    int * p =NULL;
-    if(p==nu)
-        cout<<"NULL"<<endl;
+  typedef decltype(vec.begin()) vectype;
 
+  for (vectype i = vec.begin(); i != vec.end(); i++)
+    cout << *i << " ";
+  cout << endl;
 
-    typedef decltype(vec.begin()) vectype;
+  /**
+   * 匿名结构体
+   */
+  struct {
+    int d;
+    double b;
+  } anon_s;
 
-    for(vectype i=vec.begin();i!=vec.end();i++)
-        cout<<*i<<" ";
-    cout<<endl;
+  decltype(anon_s) as{1, 2.0}; // 定义了一个上面匿名的结构体
 
-    /**
-     * 匿名结构体
-     */
-    struct
-    {
-        int d ;
-        double b;
-    }anon_s;
+  cout << multiply(11, 2) << ":" << as.b << endl;
 
-    decltype(anon_s) as; // 定义了一个上面匿名的结构体
-
-    cout<<multiply(11,2)<<endl;
-
-    return 0;
+  return 0;
 }