
<p>The <span class="RenoLink">exception_ptr</span> type is "as thread-safe as built-in types":</p>
<div><ul><li> An <span class="RenoLink">exception_ptr</span> instance can be "read" simultaneously by multiple threads</li>
<li> Different <span class="RenoLink">exception_ptr</span> instances can be "written to" simultaneously by multiple threads, even when these instances refer to the same exception object</li>
</ul></div>
<p>All other simultaneous accesses result in undefined behavior.</p>
<h4>Nesting of e