ass="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="identifier">is_alpha</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span> <span class="special">&amp;</span> Loc <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">locale</span><span class="special">(</span><span class="special">)