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<h3 class="section">15.4 <code>@allowcodebreaks</code>: Control Line Breaks in <code>@code</code></h3>
<p><a name="index-allowcodebreaks-905"></a><a name="index-Breaks_002c-within-_0040code_007b_0040_0040code_007d-906"></a><a name="index-g_t_002d_002c-breakpoint-within-_0040code_007b_0040_0040code_007d-907"></a><a name="index-Hyphen_002c-breakpoint-within-_0040code_007b_0040_0040code_007d-908"></a><a name="index-Dash_002c-breakpoint-within-_0040code_007b_0040_0040code_007d-909"></a><a name="index-g_t_005f_002c-breakpoint-within-_0040code_007b_0040_0040code_007d-910"></a><a name="index-Underscore_002c-breakpoint-within-_0040code_007b_0040_0040code_007d-911"></a>
Ordinarily, TeX will consider breaking lines at ‘<samp><span class="samp">-</span></samp>’ and
‘<samp><span class="samp">_</span></samp>’ characters within <code>@code</code> and related commands
(see <a href="code.html#code"><code>@code</code></a>), more or less as if they were “empty”
hyphenation points.
<p>This is necessary as many manuals, especially for Lisp-family
languages, must document very long identifiers. On the other hand,
other manuals don't have this problems, and you may not wish to allow
a line break at the underscore in, for example, <code>SIZE_MAX</code>, or
even worse, after any of the four underscores in <code>__typeof__</code>.
<p>So Texinfo provides this command:
<pre class="example"> @allowcodebreaks false
</pre>
<p class="noindent">to prevent TeX from breaking at ‘<samp><span class="samp">-</span></samp>’ or ‘<samp><span class="samp">_</span></samp>’ within
<code>@code</code>. You can go back to allowing such breaks with
<code>@allowcodebreaks true</code>. Write these commands on lines by
themselves.
<p>These commands can be given anywhere in the document. For example,
you may have just one problematic paragraph where you need to turn off
the breaks, but want them in general, or vice versa.
<p>This command has no effect in Info, HTML, and other non-TeX output.
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