or if c++11 is finally used: gdesc.data() On 11 May 2018 at 10:04, Jean-Yves Avenard <jyavenard at gmail.com> wrote: > On 11 May 2018 at 09:53, Jean-Yves Avenard <jyavenard at gmail.com> wrote: >> reverse that change and pass &gdesc.front() instead >> >> (and &pdesc.front()) > > actually, &*gdesc.begin() may be better.