e format <code class="computeroutput">OF_CUSTOM_LOGGER</code>, such that it can be futher selected or its stream/log level can be specified. If there is already a custom logger (with <code class="computeroutput">OF_CUSTOM_LOGGER</code>), then the existing one gets replaced by the one given in argument. The provided logger is added with an enabled state. If (unit_test_log_formatter*)0 is given as argument, the custom logger (if any) is removed and no other action is performed.</p>
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