its</em></span>
        providing a way to access certain properites defined by the enironment. Stack
        allocators use <span class="emphasis"><em>stack-traits</em></span> to allocate stacks.
      </p>
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">stack_traits</span>
<span class="special">{</span>
    <span class="keyword">static</span> <span class="keyword">bool</span> <span class="identifier">is_unbounded</span><span class="special">()</span> <span class="k