pedef <a href="./pop-back.html" class="identifier">pop_back</a>&lt;types2&gt;::type result2;
typedef <a href="./pop-back.html" class="identifier">pop_back</a>&lt;types3&gt;::type result3;

<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a>&lt;result1&gt;::value, ==, 0 );
<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a>&lt;result2&gt;::value, ==