random_access_index_ptr_array(
const Allocator& al,value_type end_,std::size_t size):
size_(size),
capacity_(size),
spc(al,capacity_+1)
{
*end()=end_;
end_->up()=end();
}
void erase(value_type x)
{
node_impl_type::extract(x->up(),end()+1);
--size_;
}
void erase(value_type x)
{
random_access_index_node_impl::extract(x->up(),end()+1);
--size_;
}