[boost] Re: std::sort(zip_iterator...) does not compile

Anthony Williams <anthony_w.geo@yahoo.com> writes:

The default implementation of swap is generally along the lines of

template<typename T> void swap(T& lhs,T& rhs) { T temp(lhs); lhs=rhs; rhs=temp; }

The initialization of temp creates a genuine copy of the data.

How so? Didn't you say that *i is a reference to a tuple of references? That makes T a tuple of references, and the initialization of a tuple of references just copies a bunch of pointers IIUC.

The two assignments then use the assignment operator of boost::tuple to assign through the references.

Does that make it clearer?

Not yet. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com