Purpose of explicit keyword - Constructor and Destructor

Discussion

• Raj   -Posted on 08 Oct 15
  Yes The purpose of explicit keyword is to tell the compiler that a certain constructor may not be used to implicitly cast an expression to its class type.
  class Dimention
  {
  private:
  int length
  
  public:
  Dimention(int x)
  {
  length=x;
  cout< }
  
  
  };
  int main()
  {
  Dimention d=10; //implicit conversion.
  
  return 0;
  }
  
  In the above example Dimention d=10; is an implicit conversion type int to type Dimention. If you want that it should not be happen then you should use keyword explicit to the constructor.
  explicit Dimention(int x)
  {
  length=x;
  cout< }
  Now you cannot write Dimention d=10; It will give compile time error. Now, only constructors of the form Dimention d(10) will be allowed.
  

➨ Post your comment / Share knowledge