iterator insert(iterator it, const value_type& v = value_type())
{
wxCHECK2(Alloc(size() + 1), return 0);
size_type idx = it - begin();
iterator insert(iterator it, const value_type& v = value_type())
{
wxCHECK2(Alloc(size() + 1), return 0);
size_type idx = it - begin();