Question

Updated

This is the method that gives me trouble:

void A::normalizeUrls()
{
    for (set<CUrl>::iterator it = _references.begin(); it != _references.end(); ++it)
    {
        if (it->isValid())
        {
            it->normalize().makeFull(_baseUrl);
        }
    }
}    

And here are CUrl::normalize and CUrl::makeFull

CUrl& makeFull (CUrl&)
{
    return *this;
}
CUrl& CUrl::normalize()
{
    return *this;
}

The errors are: CUrl::normalize' : cannot convert 'this' pointer from 'const CUrl' to 'CUrl &'

left of '.makeFull' must have class/struct/union

Why is that so, what am I missing?

Thanks in advance!

Answer 1

In practice, the members of a set are const (immutable), so you cannot call non-const member functions on them.

If that was allowed, you might change their values and invalidate the ordering of the set.