: all
        calls to allocate will throw the exception <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">bad_alloc</span></code>.
        An instance of the null resource can be used to make parsing guarantee that
        allocations from the heap are never made. This is explored in more detail
        in a later section.
      </p>
<h5>
<a name="json.allocators.storage_ptr.h4"></a>
        <span class="phrase"><a name="json.allocators.