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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>
39 </pre>
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