ld_ptr_if_copyable&lt;W&gt;</code> always null (without generating compile-time errors).</p>
<p><span class="bold"><strong>See Also:</strong></span></p>
<p> <a class="link" href="../../boost_contract/extras.html#boost_contract.extras.old_value_requirements__templates_" title="Old Value Requirements (Templates)">
        Old Value Requirements</a> </p>
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