n> <span class="identifier">line1</span><span class="special">,</span> <span class="identifier">line2</span><span class="special">;</span>

    <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">read_wkt</span><span class="special">(</span><span class="string">"linestring(1 1,2 2,3 3)"</span><span class="special">,</span> <span class="identifier">line1</span><span class="special">);</span>
    <s