What types of constructors can a class have?

A class can have the following types of constructors:

• Default Constructor: Takes no arguments. If not explicitly declared, the compiler may generate one automatically if the class does not contain user-defined constructors and does not inherit from a class with a user-defined constructor.

  class MyClass {
  public:
      MyClass() {
          // Default initialization
      }
  };
  

• Copy Constructor: Takes a const reference to an object of the same class. Used to create a new object as a copy of an existing one.

  class MyClass {
  public:
      MyClass(const MyClass& other) {
          // Copy data from 'other'
      }
  };
  

• Move Constructor: Takes an rvalue reference to an object of the same class. Used to create a new object by "moving" resources (e.g., memory ownership) from a temporary object, leaving the temporary in a valid but unspecified state. Introduced in C++11.

  class MyClass {
  public:
      MyClass(MyClass&& other) noexcept {
          // Move resources from 'other'
      }
  };
  

• Parameterized Constructors: Take one or more arguments to initialize the object.

  class MyClass {
  public:
      MyClass(int value) {
          // Initialization using 'value'
      }
  
      MyClass(int value1, double value2) {
          // Initialization using 'value1' and 'value2'
      }
  };