ublic</span> <span class="identifier">pushable</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span>
    <span class="special">:</span> <span class="identifier">BASES</span>
<span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
    <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)<