Overloaded "-" operator with references and pointers?

[Chris818]

I had made an overloaded "-" operator and it had worked perfectly fine, but since I modified it using pointers and references I'm getting an error, and I think is something wrong with the syntax. I have:

class Invoice
{
//blablabla
}

Invoice& operator-(double *x) 
  {
	  this->totalcharge = this->totalcharge - this->totalcharge * (*x * .01);
	  return *this;
  }

main()
{
Invoice *myinvoice = new Invoice();
double percentage;
//percentage is defined, and other stuff.
}

And then I call it like this:

*myinvoice = *myinvoice - percentage;

The error occurs at the minus sign in the line above, and the error is

"No operator "-" matches these operands."

Am I doing something wrong? Any help would be appreciated.

Also I realize the code can be simplified, but this is a lab for my class and I'm supposed to use certain code.

[Disch]

The - operator should not be taking a pointer. Not unless you intend to do some kind of pointer math. Pass by value or by const reference (I would recommend by value in this case).

[Chris818]

Yeah I figured that out a couple minutes ago xD Thanks.