Meaning of "~" (tilde) symbol in C++?

Question

// AirlineTicket.h

class AirlineTicket
{
public:
  AirlineTicket();

  ~AirlineTicket();
     
  int          getNumberOfMiles();
    
private:
  int          mNumberOfMiles;
};

I want now what is the meaning of ~AirlineTicket(); in this code? I don't know the meaning of ~ (tilde).

Answer 1

It is the destructor. It gets called when you destroy (reaching end of scope, or calling delete to a pointer to) the instance of the object.

Answer 2

In the context you're using it, it defines a destructor.

In other context such as the following one, it's also called bitwise negation (complement):

int a = ~100;
int b = ~a;

Output: (ideone)

-101
100