Automatically converting object to double

[Joe Van Dyk]

I have a class that is a wrapper around a double. Is there a way to
automatically convert an object of that class to a double whenever a
double is wanted?

Joe

 

[Luc The Perverse]

I have a class that is a wrapper around a double. Is there a way to
automatically convert an object of that class to a double whenever a
double is wanted?

Joe

operator double();

 

[Frederick Gotham]

Joe Van Dyk posted:

I have a class that is a wrapper around a double. Is there a way to
automatically convert an object of that class to a double whenever a
double is wanted?

Joe

class MyDouble {
private:

double obj;

public:

MyDouble(double const arg = 0) : obj(arg) {}

operator double &() { return obj; }

operator double const &() const { return obj; }
};

void FuncWantsDoubleByVal(double) {}
void FuncWantsDoubleByRef(double&) {}

int main()
{
MyDouble a;

MyDouble b = 56.3;

a += b;

b *= a;

a = 73.4;

b = 4;

FuncWantsDoubleByVal(a);

FuncWantsDoubleByRef(b);
}

 

[Joe Van Dyk]

I have a class that is a wrapper around a double. Is there a way to
automatically convert an object of that class to a double whenever a
double is wanted?

Joe

Aha.

MyClass:perator double()

Sort of weird.

Joe