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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Hyperlinked C++ BNF Grammar</title>
<style type="text/css">
body
{
font-family: Verdana, Arial;
font-size: 18;
}
h1
{
text-align: center;
font-size: 32;
}
.Credits
{
text-align: center;
}
.Section
{
font-size: 18;
text-align: right;
background-color: #FFA448;
color: black;
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tr.RuleRow
{
}
td.RuleColumn
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font-size: 16
}
.TerminalSymbol
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font-family: Lucida, Courier;
font-size: 16
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.NonTerminalSymbol
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.Description
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.Note
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A:link { color: blue; }
A:visited { color: blue; }
A:hover { color: #FFA448; }
A:active { color: red; }
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</style>
</head>
<body>
<a name="TOP"><h1>Hyperlinked C++ BNF Grammar</h1></a><div class="Credits">
<p>By <a href="https://github.com/alx71hub/hcb">Alessio Marchetti</a></p>
<p>Version 1.0</p>
<p>Last updated: 24-Mar-2024</p>
</div>
<hr>
<h2>Purpose of this document</h2>
<p>If you are a C++ developer then you sometimes need to have a look at the C++ BNF grammar. At least I do. </p>
<p>But reading a set of BNF rules is difficult since you have to jump from one rule to the next one, maybe pages away from it. </p>
<p>With this document I tried to make it easier to navigate among the BNF rules of the C++ language grammar; you can find here a hyperlinked graph whose nodes are the BNF productions of the C++ language grammar. </p>
<p>If you find errors or inconsistencies, please <a href="https://github.com/alx71hub/hcb">log an issue</a>.</p>
<h3>The BNF non-terminal for a C++ translation unit (translation-unit) is defined <a href="#basic.link">here</a>.</h3>
<h3>The BNF non-terminal for a C++ preprocessing file (preprocessing-file) is defined <a href="#cpp">here</a>.</h3>
<hr>
<h1>BNF Grammar Rules</h1>
<table>
<tr class="Section">
<td> </td>
<td><h2><a name="lex.charset">lex.charset</a></h2></td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="hex-quad"><b>hex-quad:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#hexadecimal-digit">hexadecimal-digit</a>
<a class="NonTerminalSymbol" href="#hexadecimal-digit">hexadecimal-digit</a>
<a class="NonTerminalSymbol" href="#hexadecimal-digit">hexadecimal-digit</a>
<a class="NonTerminalSymbol" href="#hexadecimal-digit">hexadecimal-digit</a>
</td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="universal-character-name"><b>universal-character-name:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>\u</b></span>
<a class="NonTerminalSymbol" href="#hex-quad">hex-quad</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>\U</b></span>
<a class="NonTerminalSymbol" href="#hex-quad">hex-quad</a>
<a class="NonTerminalSymbol" href="#hex-quad">hex-quad</a>
</td>
</tr>
<tr class="Section">
<td> </td>
<td><h2><a name="lex.pptoken">lex.pptoken</a></h2></td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="preprocessing-token"><b>preprocessing-token:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#header-name">header-name</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#import-keyword">import-keyword</a>
<span class="Note"> C++20</span>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#module-keyword">module-keyword</a>
<span class="Note"> C++20</span>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#export-keyword">export-keyword</a>
<span class="Note"> C++20</span>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#identifier">identifier</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#pp-number">pp-number</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#character-literal">character-literal</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#user-defined-character-literal">user-defined-character-literal</a>
<span class="Note"> C++11</span>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#string-literal">string-literal</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#user-defined-string-literal">user-defined-string-literal</a>
<span class="Note"> C++11</span>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#preprocessing-op-or-punc">preprocessing-op-or-punc</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="Description"><i>each non-white-space character that cannot be one of the above</i></span>
</td>
</tr>
<tr class="Section">
<td> </td>
<td><h2><a name="lex.token">lex.token</a></h2></td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="token"><b>token:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#identifier">identifier</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#keyword">keyword</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#literal">literal</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#operator-or-punctuator">operator-or-punctuator</a>
<span class="Note">See <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_toc.html">C++ Standard Core Language Issue</a> n. 189</span>
</td>
</tr>
<tr class="Section">
<td> </td>
<td><h2><a name="lex.header">lex.header</a></h2></td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="header-name"><b>header-name:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b><</b></span>
<a class="NonTerminalSymbol" href="#h-char-sequence">h-char-sequence</a>
<span class="TerminalSymbol"><b>></b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>"</b></span>
<a class="NonTerminalSymbol" href="#q-char-sequence">q-char-sequence</a>
<span class="TerminalSymbol"><b>"</b></span>
</td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="h-char-sequence"><b>h-char-sequence:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#h-char">h-char</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#h-char-sequence">h-char-sequence</a>
<a class="NonTerminalSymbol" href="#h-char">h-char</a>
</td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="h-char"><b>h-char:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="Description"><i>any member of the source character set except new-line and ></i></span>
</td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="q-char-sequence"><b>q-char-sequence:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#q-char">q-char</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#q-char-sequence">q-char-sequence</a>
<a class="NonTerminalSymbol" href="#q-char">q-char</a>
</td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="q-char"><b>q-char:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="Description"><i>any member of the source character set except new-line and "</i></span>
</td>
</tr>
<tr class="Section">
<td> </td>
<td><h2><a name="lex.ppnumber">lex.ppnumber</a></h2></td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="pp-number"><b>pp-number:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#digit">digit</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>.</b></span>
<a class="NonTerminalSymbol" href="#digit">digit</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#pp-number">pp-number</a>
<a class="NonTerminalSymbol" href="#digit">digit</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#pp-number">pp-number</a>
<a class="NonTerminalSymbol" href="#identifier-nondigit">identifier-nondigit</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#pp-number">pp-number</a>
<span class="TerminalSymbol"><b>'</b></span>
<a class="NonTerminalSymbol" href="#digit">digit</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#pp-number">pp-number</a>
<span class="TerminalSymbol"><b>'</b></span>
<a class="NonTerminalSymbol" href="#nondigit">nondigit</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#pp-number">pp-number</a>
<span class="TerminalSymbol"><b>e</b></span>
<a class="NonTerminalSymbol" href="#sign">sign</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#pp-number">pp-number</a>
<span class="TerminalSymbol"><b>E</b></span>
<a class="NonTerminalSymbol" href="#sign">sign</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#pp-number">pp-number</a>
<span class="TerminalSymbol"><b>p</b></span>
<a class="NonTerminalSymbol" href="#sign">sign</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#pp-number">pp-number</a>
<span class="TerminalSymbol"><b>P</b></span>
<a class="NonTerminalSymbol" href="#sign">sign</a>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#pp-number">pp-number</a>
<span class="TerminalSymbol"><b>.</b></span>
</td>
</tr>
<tr class="Section">
<td> </td>
<td><h2><a name="lex.name">lex.name</a></h2></td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="identifier"><b>identifier:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#identifier-nondigit">identifier-nondigit</a>
<span class="Note"> C++11</span>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#identifier">identifier</a>
<a class="NonTerminalSymbol" href="#identifier-nondigit">identifier-nondigit</a>
<span class="Note"> C++11</span>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#identifier">identifier</a>
<a class="NonTerminalSymbol" href="#digit">digit</a>
</td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="identifier-nondigit"><b>identifier-nondigit:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#nondigit">nondigit</a>
<span class="Note"> C++11</span>
</td>
</tr>
<tr>
<td> </td>
<td>
<a class="NonTerminalSymbol" href="#universal-character-name">universal-character-name</a>
<span class="Note"> C++11</span>
</td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="nondigit"><b>nondigit:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>a</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>b</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>c</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>d</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>e</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>f</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>g</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>h</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>i</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>j</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>k</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>l</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>m</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>n</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>o</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>p</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>q</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>r</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>s</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>t</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>u</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>v</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>w</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>x</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>y</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>z</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>A</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>B</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>C</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>D</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>E</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>F</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>G</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>H</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>I</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>J</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>K</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>L</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>M</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>N</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>O</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>P</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>Q</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>R</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>S</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>T</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>U</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>V</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>W</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>X</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>Y</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>Z</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>_</b></span>
<span class="Note"> (underscore)</span>
</td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="digit"><b>digit:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>0</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>1</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>2</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>3</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>4</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>5</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>6</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>7</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>8</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>9</b></span>
</td>
</tr>
<tr class="Section">
<td> </td>
<td><h2><a name="lex.key">lex.key</a></h2></td>
</tr>
<tr class="RuleRow">
<td class="RuleColumn"><a name="keyword"><b>keyword:</b></a></td>
<td>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>alignas</b></span>
<span class="Note"> C++11</span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>alignof</b></span>
<span class="Note"> C++11</span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>asm</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>auto</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>bool</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>break</b></span>
</td>
</tr>
<tr>
<td> </td>
<td>
<span class="TerminalSymbol"><b>case</b></span>
</td>
</tr>