eroutput"><span class="identifier">BOOST_HAS_THREADS</span></code>
        is defined: this macro is set automatically by the config system when threading
        support is turned on in your compiler.
      </p>
<p>
        Class <a class="link" href="../ref/basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a>
        and its typedefs regex and wregex are thread safe, in that compiled regular
        expressions can safely be shared betwe