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    <p>Here's another one, and I suspect it must be connected with the
      C2766.</p>
    <p><span style="font-family:monospace"><span
          style="color:#000000;background-color:#ffffff;">lst.h(35):
          error C2512:
          'GiNaC::class_info<GiNaC::registered_class_options>': no
          appropriate default constructor available</span><br>
      </span></p>
    <p>Because to fix this error, I supplied the requested default
      constructor in <br>
    </p>
    <p>class_info.h line 48:</p>
    <p><span style="font-family:monospace"><span
          style="color:#000000;background-color:#ffffff;">class_info() </span><span
          style="color:#b218b2;background-color:#ffffff;">{</span><span
          style="color:#000000;background-color:#ffffff;"> </span><span
          style="color:#b218b2;background-color:#ffffff;">}</span><br>
      </span></p>
    <p>which forces me to supply another default constructor <br>
    </p>
    <p><span style="font-family:monospace"><span
          style="color:#000000;background-color:#ffffff;">class_info.h(48):
          error C2512: 'GiNaC::registered_class_options': no appropriate
          default constructor available</span><br>
      </span></p>
    <p>registrar.h line 85:</p>
    <p><span style="font-family:monospace"><span
          style="color:#000000;background-color:#ffffff;">registered_class_options()
        </span><span style="color:#b218b2;background-color:#ffffff;">{</span><span
          style="color:#000000;background-color:#ffffff;"> </span><span
          style="color:#b218b2;background-color:#ffffff;">}</span><br>
      </span></p>
    <p>and then the "no appropriate default constructor" errors go away
      but later on in the compile the C2766 turns up.</p>
    <p>Jan Rheinländer</p>
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