Re: What's the point of passing parameter by value (vs. const ref)

"Martin T." <0xCDCDC...@gmx.at> wrote in message
news:g4ferd$sji$1@registered.motzarella.org...


One possibility is that you might be mistaken about whether it works just as
well.

Here's an example:

     // Divide all the elements of a vector<double> by a constant
     void vec_divide(vector<double>& v, const double& x)
     {
         for (vector<double>::iterator it = v.begin(); it != v.end(); ++it)
             *it /= x;
     }

Now consider what happens when you call

     vector<double> v;
     v.push_back(1.23);
     v.push_back(4.56);
     vec_divide(v, v[0]);

If you don't see the problem, try running it.