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<a href="../../ex/cpp_3A_3A/_23elseif.html"><img src="../../../images/prev.gif" hspace="3"
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<h1>Directive #endif</h1>
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<hr />
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<dl class='group--doc'>
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<dt class='head--type'><span class='homogen--type'>Directive</span>
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<span class='homogen--name'><b>#endif</b></span>
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</dt>
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<dd><p><code class='directive'>#if</code><br>
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<code class='directive'>#elif</code><br>
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<code class='directive'>#elseif</code><br>
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<code class='directive'>#else</code><br>
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<code class='directive'>#endif</code></p></dd>
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<dt class='head--doc'>Description</dt>
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<dd class='body--doc'>
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<p>The #if directive causes conditional compiling of code depending on
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the expression after the #if directive. That is, if the expression
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is true, the code up to the next #else, #elif, #elseif or #endif is
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compiled. If the expression is false, that code will be skipped.
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If the skip leads up to a #else, the code after the else will be
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compiled. #elif and #elseif are equivialent and causes the code that
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follow them to be compiled if the previous #if or #elif evaluated
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false and the expression after the #elif evaluates true.
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</p>
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<p>Expressions given to #if, #elif or #endif are special, all identifiers
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evaluate to zero unless they are defined to something else. Integers,
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strings and floats are the only types that can be used, but all lpc
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operators can be used on these types.
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</p>
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<p>Also, two special functions can be used, defined() and efun().
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defined(<identifer>) expands to '1' if the identifier is defined,
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'0' otherwise. efun(<identifier>) expands to '1' if identifer is
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an efun, '0' otherwise.</p>
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</dd>
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<dt class='head--doc'>Example</dt>
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<dd class='example'><pre>
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<tt><p>#if 1<br />
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<dl class='group--doc'><dd>write("foo");<br />
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</dd>
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</dl>#else<br />
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<dl class='group--doc'><dd>write("bar");<br />
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</dd>
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</dl>#endif<br />
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</p>
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<p>#if defined(FOO)<br />
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<dl class='group--doc'><dd>write(FOO);<br />
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</dd>
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</dl>#elif defined(BAR)<br />
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<dl class='group--doc'><dd>write(BAR);<br />
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</dd>
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</dl>#else<br />
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<dl class='group--doc'><dd>write("default");<br />
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</dd>
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</dl>#endif<br />
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</p>
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<p>#if !efun(write_file)<br />
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inherit "simulate.lpc"<br />
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#endif<br />
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<br />
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</p>
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</tt></pre></dd></dl>
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