ems:</p>
<ul>
  <li>The combination of member function templates and implicit constructors can 
  result in unclear error messages when the user makes simple commonplace coding 
  errors. This should be much less of a problem with C++ concepts, but in the 
  meantime work continues to restrict over aggressive templates via enable_if/disable_if.</li>
</ul>
  <h2><a name="Details">Details</a></h2>

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