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  <p>
            Asio's implementation can use <code class="computeroutput">std::shared_ptr&lt;&gt;</code> and
            <code class="computeroutput">std::weak_ptr&lt;&gt;</code> in preference to the Boost equivalents.
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  <p>
            Support for the standard smart pointers is automatically enabled for <code class="literal">g++</code>
            4.3 and later, when the <code class="literal">-std=c++0x</code> or <code class="literal">-std=gnu++0x</code>
            compiler options are used, as well as for Microsoft Visual C++ 10. It may
            be disabled by defining <code class="computeroutput">ASIO_DISABLE_STD_SHARED_PTR</code>, or explicitly
            enabled for other compilers by defining <code class="computeroutput">ASIO_HAS_STD_SHARED_PTR</code>.
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  <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2018 Christopher M. Kohlhoff<p>
          Distributed under the Boost Software License, Version 1.0. (See accompanying
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