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| <title>The GNU Fortran Compiler: ALLOCATED</title> |
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| <a name="ALLOCATED-_002d_002d_002d-Status-of-an-allocatable-entity"></a> |
| <h3 class="section">8.14 <code>ALLOCATED</code> — Status of an allocatable entity</h3> |
| <a name="index-ALLOCATED"></a> |
| <a name="index-allocation_002c-status"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>ALLOCATED(ARRAY)</code> and <code>ALLOCATED(SCALAR)</code> check the allocation |
| status of <var>ARRAY</var> and <var>SCALAR</var>, respectively. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 95 and later. Note, the <code>SCALAR=</code> keyword and allocatable |
| scalar entities are available in Fortran 2003 and later. |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Inquiry function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><table> |
| <tr><td width="80%"><code>RESULT = ALLOCATED(ARRAY)</code></td></tr> |
| <tr><td width="80%"><code>RESULT = ALLOCATED(SCALAR)</code></td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>ARRAY</var></td><td width="70%">The argument shall be an <code>ALLOCATABLE</code> array.</td></tr> |
| <tr><td width="15%"><var>SCALAR</var></td><td width="70%">The argument shall be an <code>ALLOCATABLE</code> scalar.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>The return value is a scalar <code>LOGICAL</code> with the default logical |
| kind type parameter. If the argument is allocated, then the result is |
| <code>.TRUE.</code>; otherwise, it returns <code>.FALSE.</code> |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program test_allocated |
| integer :: i = 4 |
| real(4), allocatable :: x(:) |
| if (.not. allocated(x)) allocate(x(i)) |
| end program test_allocated |
| </pre></div> |
| </dd> |
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