$$ [C++11] $$ In $$ C++11 $$, you can tell the compiler to explicitly generate the default version of a default constructor, copy constructor, move constructor, copy assignment operator, move assignment operator or destructor by following the special member function's prototype with explicit (default) default

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In C++11, you can explicitly instruct the compiler to generate the default version of special member functions (like constructors, assignment operators, and destructors) by using the `= default` syntax. This is useful when you want to ensure that the compiler provides a default implementation for these functions, especially in classes that have user-defined constructors or other special member functions.

Here's how you can declare these special member functions using `= default`:

1. **Default Constructor**:
   ```cpp
   class MyClass {
   public:
       MyClass() = default; // Default constructor
   };
   ```

2. **Copy Constructor**:
   ```cpp
   class MyClass {
   public:
       MyClass(const MyClass&) = default; // Copy constructor
   };
   ```

3. **Move Constructor**:
   ```cpp
   class MyClass {
   public:
       MyClass(MyClass&&) = default; // Move constructor
   };
   ```

4. **Copy Assignment Operator**:
   ```cpp
   class MyClass {
   public:
       MyClass& operator=(const MyClass&) = default; // Copy assignment operator
   };
   ```

5. **Move Assignment Operator**:
   ```cpp
   class MyClass {
   public:
       MyClass& operator=(MyClass&&) = default; // Move assignment operator
   };
   ```

6. **Destructor**:
   ```cpp
   class MyClass {
   public:
       ~MyClass() = default; // Destructor
   };
   ```

### Explanation:
- **Default Constructor**: This constructor is called when an object is created without any parameters.
- **Copy Constructor**: This constructor is called when a new object is created as a copy of an existing object.
- **Move Constructor**: This constructor is called when an object is initialized by transferring resources from a temporary object.
- **Copy Assignment Operator**: This operator is used to copy the value from one object to another already existing object.
- **Move Assignment Operator**: This operator is used to transfer resources from a temporary object to an already existing object.
- **Destructor**: This function is called when an object goes out of scope or is explicitly deleted.

Using `= default` is a clear way to indicate that you want the compiler to generate the default behavior for these functions, which can help avoid issues with implicit declarations and ensure that the class behaves as expected.
In C++11, you can use `= default` to let the compiler generate default versions of special member functions like constructors and assignment operators. This ensures that the compiler provides standard implementations for these functions, which can help prevent issues and ensure proper class behavior.

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