整数C ++包装器

Question

I'm doing a very small and simple Integer class wrapper in C++, which globaly looks like this:

class Int
{
  ...
private:
  int value;
  ...
}

I handled almost all the possible assignements, but I don't find out what kind of operator I have to use to get native left assignement.

eg:

Int myInteger(45);
int x = myInteger;

Answer 1

You might want a conversion operator to convert to int:

class Int
{
 public:
  operator int() const { return value; }
 ...
};

This allows the following initialization of an int

int x = myInteger;

In C++11, you can decide whether you restrict that conversion to int , or whether you allow further conversions from int to something else. To restrict to int , use an explicit conversion operator:

explicit operator int() const { return value; }

although it is probably not necessary in this case.