Not repeating the same operation

[jhapk]

Hi,

in a few functions I am doing the same operation, multiplying two static variables every time those functions are called, something like this:

double ClassName::FunctionName1(void) const{
  
  double C = alpha*beta;

   /* do something */

  return VariableName2;
}

double ClassName::FunctionName2(void) const{
  
  double C = alpha*beta;

   /* do something different */

  return VariableName2;
}

double ClassName::FunctionName3(void) const{
  
  double C = alpha*beta;

   /* do something very different */

  return VariableName3;
}

Both alpha and beta are static variables of class ClassName specified right at the beginning when the program is executed. Each function is called millions of time, and so I was wondering is there any way that I can avoid doing this multiplication every time these functions are called?

I don't want to declare C as a static member of ClassName.

Thank you so much.

[Disch]

I'm assuming alpha and beta can change between FunctionName calls (ie they're nonconstant)

I don't want to declare C as a static member of ClassName.

That's the best way to do it.

You have two options:

1) do the multiplication every time

or

2) have a variable remember the result of the multiplication. That variable's lifetime will obviously need to be longer than the functions (ie: needs to be global/class scope).

[jhapk]

Hi Disch,

the value of alpha and beta remains constant for all Functions. Thanks for your reply.