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  29. <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="identifier">statement</span><span class="special">/</span><span class="keyword">if</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
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  31. <p>
  32. We have seen the <code class="computeroutput"><span class="identifier">if_</span></code> statement.
  33. The syntax is:
  34. </p>
  35. <pre class="programlisting"><span class="identifier">if_</span><span class="special">(</span><span class="identifier">conditional_expression</span><span class="special">)</span>
  36. <span class="special">[</span>
  37. <span class="identifier">sequenced_statements</span>
  38. <span class="special">]</span>
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