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<p>default <a class="el" href="classtacopie_1_1io__service.html">io_service</a> getter &amp; setter if the default is fetched for the first time, build it, otherwise return the current instance if the <a class="el" href="classtacopie_1_1io__service.html">io_service</a> already exist, return it and reset its number of workers if necessary</p>
<dl class="params"><dt>Parameters</dt><dd>
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