153 lines
5.1 KiB
HTML
153 lines
5.1 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1999-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>The GNU Fortran Compiler: MALLOC</title>
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<meta name="description" content="The GNU Fortran Compiler: MALLOC">
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<meta name="keywords" content="The GNU Fortran Compiler: MALLOC">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Intrinsic-Procedures.html#Intrinsic-Procedures" rel="up" title="Intrinsic Procedures">
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<link href="MASKL.html#MASKL" rel="next" title="MASKL">
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<link href="LTIME.html#LTIME" rel="prev" title="LTIME">
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="MALLOC"></a>
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<div class="header">
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<p>
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Next: <a href="MASKL.html#MASKL" accesskey="n" rel="next">MASKL</a>, Previous: <a href="LTIME.html#LTIME" accesskey="p" rel="prev">LTIME</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<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>
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</div>
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<hr>
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<a name="MALLOC-_002d_002d_002d-Allocate-dynamic-memory"></a>
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<h3 class="section">9.176 <code>MALLOC</code> — Allocate dynamic memory</h3>
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<a name="index-MALLOC"></a>
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<a name="index-pointer_002c-cray-1"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>MALLOC(SIZE)</code> allocates <var>SIZE</var> bytes of dynamic memory and
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returns the address of the allocated memory. The <code>MALLOC</code> intrinsic
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is an extension intended to be used with Cray pointers, and is provided
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in GNU Fortran to allow the user to compile legacy code. For new code
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using Fortran 95 pointers, the memory allocation intrinsic is
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<code>ALLOCATE</code>.
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</p>
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</dd>
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<dt><em>Standard</em>:</dt>
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<dd><p>GNU extension
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</p>
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</dd>
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<dt><em>Class</em>:</dt>
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<dd><p>Function
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><p><code>PTR = MALLOC(SIZE)</code>
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</p>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>SIZE</var></td><td width="70%">The type shall be <code>INTEGER</code>.</td></tr>
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</table>
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</dd>
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<dt><em>Return value</em>:</dt>
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<dd><p>The return value is of type <code>INTEGER(K)</code>, with <var>K</var> such that
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variables of type <code>INTEGER(K)</code> have the same size as
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C pointers (<code>sizeof(void *)</code>).
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</p>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><p>The following example demonstrates the use of <code>MALLOC</code> and
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<code>FREE</code> with Cray pointers.
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</p>
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<div class="smallexample">
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<pre class="smallexample">program test_malloc
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implicit none
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integer i
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real*8 x(*), z
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pointer(ptr_x,x)
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ptr_x = malloc(20*8)
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do i = 1, 20
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x(i) = sqrt(1.0d0 / i)
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end do
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z = 0
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do i = 1, 20
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z = z + x(i)
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print *, z
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end do
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call free(ptr_x)
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end program test_malloc
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</pre></div>
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</dd>
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<dt><em>See also</em>:</dt>
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<dd><p><a href="FREE.html#FREE">FREE</a>
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</p></dd>
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</dl>
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</body>
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</html>
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