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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  2. <html>

  3. <!-- Copyright (C) 1988-2020 Free Software Foundation, Inc.

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  5. Permission is granted to copy, distribute and/or modify this document

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  8. Invariant Sections being "Funding Free Software", the Front-Cover

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  10. (see below).  A copy of the license is included in the section entitled

  11. "GNU Free Documentation License".

  12. 

  13. (a) The FSF's Front-Cover Text is:

  14. 

  15. A GNU Manual

  16. 

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  23. <head>

  24. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

  25. <title>Subscripting (Using the GNU Compiler Collection (GCC))</title>

  26. 

  27. <meta name="description" content="Subscripting (Using the GNU Compiler Collection (GCC))">

  28. <meta name="keywords" content="Subscripting (Using the GNU Compiler Collection (GCC))">

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  32. <link href="index.html#Top" rel="start" title="Top">

  33. <link href="Option-Index.html#Option-Index" rel="index" title="Option Index">

  34. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  35. <link href="C-Extensions.html#C-Extensions" rel="up" title="C Extensions">

  36. <link href="Pointer-Arith.html#Pointer-Arith" rel="next" title="Pointer Arith">

  37. <link href="Escaped-Newlines.html#Escaped-Newlines" rel="prev" title="Escaped Newlines">

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  67. </head>

  68. 

  69. <body lang="en">

  70. <a name="Subscripting"></a>

  71. <div class="header">

  72. <p>

  73. Next: <a href="Pointer-Arith.html#Pointer-Arith" accesskey="n" rel="next">Pointer Arith</a>, Previous: <a href="Escaped-Newlines.html#Escaped-Newlines" accesskey="p" rel="prev">Escaped Newlines</a>, Up: <a href="C-Extensions.html#C-Extensions" accesskey="u" rel="up">C Extensions</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>

  74. </div>

  75. <hr>

  76. <a name="Non_002dLvalue-Arrays-May-Have-Subscripts"></a>

  77. <h3 class="section">6.23 Non-Lvalue Arrays May Have Subscripts</h3>

  78. <a name="index-subscripting"></a>

  79. <a name="index-arrays_002c-non_002dlvalue"></a>

  80. 

  81. <a name="index-subscripting-and-function-values"></a>

  82. <p>In ISO C99, arrays that are not lvalues still decay to pointers, and

  83. may be subscripted, although they may not be modified or used after

  84. the next sequence point and the unary &lsquo;<samp>&amp;</samp>&rsquo; operator may not be

  85. applied to them.  As an extension, GNU C allows such arrays to be

  86. subscripted in C90 mode, though otherwise they do not decay to

  87. pointers outside C99 mode.  For example,

  88. this is valid in GNU C though not valid in C90:

  89. </p>

  90. <div class="smallexample">

  91. <pre class="smallexample">struct foo {int a[4];};

  92. 

  93. struct foo f();

  94. 

  95. bar (int index)

  96. {

  97.   return f().a[index];

  98. }

  99. </pre></div>

  100. 

  101. 

  102. 

  103. 

  104. </body>

  105. </html>