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| <title>The GNU Fortran Compiler: MALLOC</title> |
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| <a name="MALLOC-_002d_002d_002d-Allocate-dynamic-memory"></a> |
| <h3 class="section">8.161 <code>MALLOC</code> — 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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