[boost] Re: ccref

From: alnsn_at_[hidden]
Date: 2004-07-01 00:16:35

David Abrahams wrote:
> Maybe you should show an example of code where the use of ref/cref
> causes a problem.

using namespace std;
using namespace boost;

template<class T>
reference_wrapper<T const> head(vector<T> const& v)
{
    return cref(v[0]); // binds with temporary if T == bool
}

int main()
{
    bool buf[1] = {};
    vector<bool> v(buf, buf + 1);
    reference_wrapper<bool const> r = head(v);
}

Similar problem with ref:

int const const_rvalue();
ref(const_rvalue()); // binds with a temporary

Is it possible to protect from this effect at least for ref case?

-- 
Alexander Nasonov