er_boost_core_cmath_hpp.sign_manipulation_functions.template_class_t_bool_signbit_t_" title="template&lt;class T&gt; bool signbit( T x );">template&lt;class
          T&gt; bool signbit( T x );</a>
</h5></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
                <span class="bold"><strong>Requires:</strong></span> <code class="computeroutput"><span class="identifier">T</span></code>
                must be <code class="computer