https://svn.boost.org/trac10/ticket/12503 <p> I have found a situation where with multipolygons <code>is_valid</code> seems to be returning that a multipolygon is invalid but I am not certain that the result is correct. It also seems that commonly is_valid will return intersection points that are not actually the correct intersection points in validity tests (not in testcase). </p> <p> Testcase: </p> <p> <a class="ext-link" href="https://github.com/flippmoke/boost-geometry-is-valid-bug"><span class="icon">​</span>https://github.com/flippmoke/boost-geometry-is-valid-bug</a> </p> <p> Thanks, </p> <p> Blake Thompson </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/12503 Trac 1.4.3 anonymous Mon, 09 Jan 2017 05:30:19 GMT https://svn.boost.org/trac10/ticket/12503#comment:2 https://svn.boost.org/trac10/ticket/12503#comment:2 <ul> <li><strong>status</strong> <span class="trac-field-old">new</span> → <span class="trac-field-new">closed</span> </li> <li><strong>version</strong> <span class="trac-field-old">Boost 1.61.0</span> → <span class="trac-field-new">Boost 1.65.0</span> </li> <li><strong>resolution</strong> → <span class="trac-field-new">fixed</span> </li> </ul> <p> It is fixed in the meantime, most probably in 1.65 but I just tested it for upcoming 1.66 and created a testcase </p> Ticket Barend Gehrels Mon, 23 Oct 2017 10:51:46 GMT