I'm writing something performance-critical and wanted to know if it could make a difference if I use:

int test( int a, int b, int c )
{
    // Do millions of calculations with a, b, c
}

or

class myStorage
{
public:
  int a, b, c;
};

int test( myStorage values )
{
   // Do millions of calculations with values.a, values.b, values.c
}

• Does this basically result in similar code? Is there an extra overhead of accessing the class members?

I'm sure that this is clear to an expert in C++ so I won't try and write an unrealistic benchmark for it right now