support bazel complie this project and format code.

cpp2.0/cpp11/default_delete.cpp

@@ -0,0 +1,107 @@
+//
+// Created by light on 19-11-3.
+//
+
+#include <iostream>
+#include <complex>
+
+using namespace std;
+
+class Zoo {
+
+public:
+    Zoo(int a, int b) : a(a), b(b) {
+        cout << "with param ctor \n";
+    }
+
+    Zoo() = default;
+
+    Zoo(const Zoo &) = delete;  // copy ctor
+
+    Zoo(Zoo &&) = default;      // move ctor
+
+    Zoo &operator=(const Zoo &) = default;  // copy assignment
+
+    Zoo &operator=(const Zoo &&) = delete;  // move assignment
+
+    // 一般函数可以使用=default或=delete?
+//    void fun1()= default; // error: ‘void Zoo::fun1()’ cannot be defaulted
+    void fun1() = delete; // compile ok
+    // 析构函数可以使用=default或=delete?
+//    ~Zoo()= delete;   // ok,但是造成使用Zoo object出错
+    ~Zoo() = default;
+
+    // 上述得出=delete可以使用在任何函数身上,而=default不可以使用在普通函数上
+    // 上述会联想到=0,=0只能用在virtual funciton上
+
+private:
+    int a, b;
+};
+
+class Empty {
+};
+
+// 等价于  编译器给出的默认版本函数都是public且inline
+class Empty1 {
+public:
+    Empty1() {}
+
+    Empty1(const Empty1 &rhs) {}
+
+    ~Empty1() {}
+};
+
+// no-copy
+// copy ctor与copy assignment都delete掉
+struct NoCopy {
+    NoCopy() = default;
+
+    NoCopy(const NoCopy &) = delete;
+
+    NoCopy &operator=(const NoCopy &) = delete;
+
+    ~NoCopy() = default;
+};
+
+// no-dtor
+struct NoDtor {
+    NoDtor() = default;
+
+    ~NoDtor() = delete;
+};
+
+// 对no-copy的改进 将copy ctor与copy assignment 放到private ,但是可以对member与friend调用
+// boost::noncopyable 就用到了PrivateCopy
+class PrivateCopy {
+private:
+    PrivateCopy(const PrivateCopy &) {};
+
+    PrivateCopy &operator=(const PrivateCopy &) {};
+
+public:
+    PrivateCopy() = default;
+
+    ~PrivateCopy() {};
+};
+
+// 继承了的都拥有PrivateCopy性质
+class Foo : public PrivateCopy {
+
+};
+
+int main() {
+    Zoo z;
+    Zoo z1(1, 2);
+//    Zoo z2=z;   // error copy ctor delete
+    z = z1;
+    complex<int> a;     // 内部不带指针的可以不用写 big three 没有析构 有copy ctor与copy assignmetn 都是使用=default,没有自己写
+    string s;       // 内部带指针的有big five
+
+//    NoDtor n;  //error no-dtor 不能够自动delete
+//    NoDtor *p=new NoDtor;   // ok
+//    delete p;   // error no-dtor 不能够delete
+    Foo foo;
+    Foo foo1;
+//    foo = foo1;   // 继承了的都拥有PrivateCopy性质
+    return 0;
+}