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<td><p><span class="term">Effects:</span></p></td>
<td>Makes a copy of <code class="computeroutput">rhs</code>,
            discarding previous content, so that the new content of is
            equivalent in both type and value to
            <code class="computeroutput">rhs</code>.</td>
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<td><p><span class="term">Throws:</span></p></td>
<td>
<code class="computeroutput">std::bad_alloc</code>
            or any exceptions arising from the copy c