void check_dupes(const Ptree &pt)
{
if(pt.size() <= 1)
return;
const typename Ptree::key_type *lastkey = 0;
typename Ptree::const_assoc_iterator it = pt.ordered_begin(),
end = pt.not_found();
lastkey = &it->first;
for(++it; it != end; ++it) {
if(*lastkey == it->first)
BOOST_PROPERTY_TREE_THROW(ini_parser_error(
"duplicate key", "", 0));
lastkey = &it->first;
}
}
