d returned
</span><span class="c1">// from our as_result() factory function. This implementation is
</span><span class="c1">// for functions with handlers void(error_code, T) only.
</span><span class="c1"></span><span class="k">template</span> <span class="o">&lt;</span><span class="k">class</span><span class="err"> </span><span class="nc">CompletionToken</span><span class="p">,</span> <span class="k">class</span><span class="err"> </span><span class="nc">T</span><span class="o">&gt;</span>                 