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What is conversion operator?

What is conversion operator??

class can have a public method for specific data type conversions.

for example:
class Boo
{
  double value;
  public:
    Boo(int i )
    operator double()
    {
  return value;
    }
};

Boo BooObject;

double i  = BooObject; // assigning object to variable i of type double.
now conversion  operator gets called to assign the value.