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I have written an integration function (of one variable)

`double integrate(double (*f)(double), const double a, const double b)`

However, now I want to integrate a function of one variable, but the c++ function has an additional parameter:

```
double f(double x, bool flag)
{
if(flag == true)
f = pow(x,2);
else
f = pow(x,3);
}
```

I can't pass that to my integrate() function because it has the wrong number of arguments. How do you get around this?

Thanks,

Dave