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authoralk3pInjection <webmaster@raspii.tech>2024-02-04 16:16:35 +0800
committeralk3pInjection <webmaster@raspii.tech>2024-02-04 16:16:35 +0800
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tree00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gfortran/MALLOC.html
Import stripped Arm GNU Toolchain 13.2.Rel1HEADumineko
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+<title>The GNU Fortran Compiler: MALLOC</title>
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+<hr>
+<a name="MALLOC-_002d_002d_002d-Allocate-dynamic-memory"></a>
+<h3 class="section">8.184 <code>MALLOC</code> &mdash; Allocate dynamic memory</h3>
+<a name="index-MALLOC"></a>
+<a name="index-pointer_002c-cray-1"></a>
+
+<dl compact="compact">
+<dt><em>Description</em>:</dt>
+<dd><p><code>MALLOC(SIZE)</code> allocates <var>SIZE</var> bytes of dynamic memory and
+returns the address of the allocated memory. The <code>MALLOC</code> intrinsic
+is an extension intended to be used with Cray pointers, and is provided
+in GNU Fortran to allow the user to compile legacy code. For new code
+using Fortran 95 pointers, the memory allocation intrinsic is
+<code>ALLOCATE</code>.
+</p>
+</dd>
+<dt><em>Standard</em>:</dt>
+<dd><p>GNU extension
+</p>
+</dd>
+<dt><em>Class</em>:</dt>
+<dd><p>Function
+</p>
+</dd>
+<dt><em>Syntax</em>:</dt>
+<dd><p><code>PTR = MALLOC(SIZE)</code>
+</p>
+</dd>
+<dt><em>Arguments</em>:</dt>
+<dd><table>
+<tr><td width="15%"><var>SIZE</var></td><td width="70%">The type shall be <code>INTEGER</code>.</td></tr>
+</table>
+
+</dd>
+<dt><em>Return value</em>:</dt>
+<dd><p>The return value is of type <code>INTEGER(K)</code>, with <var>K</var> such that
+variables of type <code>INTEGER(K)</code> have the same size as
+C pointers (<code>sizeof(void *)</code>).
+</p>
+</dd>
+<dt><em>Example</em>:</dt>
+<dd><p>The following example demonstrates the use of <code>MALLOC</code> and
+<code>FREE</code> with Cray pointers.
+</p>
+<div class="smallexample">
+<pre class="smallexample">program test_malloc
+ implicit none
+ integer i
+ real*8 x(*), z
+ pointer(ptr_x,x)
+
+ ptr_x = malloc(20*8)
+ do i = 1, 20
+ x(i) = sqrt(1.0d0 / i)
+ end do
+ z = 0
+ do i = 1, 20
+ z = z + x(i)
+ print *, z
+ end do
+ call free(ptr_x)
+end program test_malloc
+</pre></div>
+
+</dd>
+<dt><em>See also</em>:</dt>
+<dd><p><a href="FREE.html#FREE">FREE</a>
+</p></dd>
+</dl>
+
+
+
+
+
+
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+</html>
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