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| <title>The GNU Fortran Compiler: ASSOCIATED</title> |
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| <a name="ASSOCIATED-_002d_002d_002d-Status-of-a-pointer-or-pointer_002ftarget-pair"></a> |
| <h3 class="section">8.20 <code>ASSOCIATED</code> — Status of a pointer or pointer/target pair</h3> |
| <a name="index-ASSOCIATED"></a> |
| <a name="index-pointer_002c-status"></a> |
| <a name="index-association-status"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>ASSOCIATED(POINTER [, TARGET])</code> determines the status of the pointer |
| <var>POINTER</var> or if <var>POINTER</var> is associated with the target <var>TARGET</var>. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 95 and later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Inquiry function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>RESULT = ASSOCIATED(POINTER [, TARGET])</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>POINTER</var></td><td width="70%"><var>POINTER</var> shall have the <code>POINTER</code> attribute |
| and it can be of any type.</td></tr> |
| <tr><td width="15%"><var>TARGET</var></td><td width="70%">(Optional) <var>TARGET</var> shall be a pointer or |
| a target. It must have the same type, kind type parameter, and |
| array rank as <var>POINTER</var>.</td></tr> |
| </table> |
| <p>The association status of neither <var>POINTER</var> nor <var>TARGET</var> shall be |
| undefined. |
| </p> |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p><code>ASSOCIATED(POINTER)</code> returns a scalar value of type <code>LOGICAL(4)</code>. |
| There are several cases: |
| </p><dl compact="compact"> |
| <dt>(A) When the optional <var>TARGET</var> is not present then</dt> |
| <dd><p><code>ASSOCIATED(POINTER)</code> is true if <var>POINTER</var> is associated with a target; otherwise, it returns false. |
| </p></dd> |
| <dt>(B) If <var>TARGET</var> is present and a scalar target, the result is true if</dt> |
| <dd><p><var>TARGET</var> is not a zero-sized storage sequence and the target associated with <var>POINTER</var> occupies the same storage units. If <var>POINTER</var> is |
| disassociated, the result is false. |
| </p></dd> |
| <dt>(C) If <var>TARGET</var> is present and an array target, the result is true if</dt> |
| <dd><p><var>TARGET</var> and <var>POINTER</var> have the same shape, are not zero-sized arrays, |
| are arrays whose elements are not zero-sized storage sequences, and |
| <var>TARGET</var> and <var>POINTER</var> occupy the same storage units in array element |
| order. |
| As in case(B), the result is false, if <var>POINTER</var> is disassociated. |
| </p></dd> |
| <dt>(D) If <var>TARGET</var> is present and an scalar pointer, the result is true</dt> |
| <dd><p>if <var>TARGET</var> is associated with <var>POINTER</var>, the target associated with |
| <var>TARGET</var> are not zero-sized storage sequences and occupy the same storage |
| units. |
| The result is false, if either <var>TARGET</var> or <var>POINTER</var> is disassociated. |
| </p></dd> |
| <dt>(E) If <var>TARGET</var> is present and an array pointer, the result is true if</dt> |
| <dd><p>target associated with <var>POINTER</var> and the target associated with <var>TARGET</var> |
| have the same shape, are not zero-sized arrays, are arrays whose elements are |
| not zero-sized storage sequences, and <var>TARGET</var> and <var>POINTER</var> occupy |
| the same storage units in array element order. |
| The result is false, if either <var>TARGET</var> or <var>POINTER</var> is disassociated. |
| </p></dd> |
| </dl> |
| |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program test_associated |
| implicit none |
| real, target :: tgt(2) = (/1., 2./) |
| real, pointer :: ptr(:) |
| ptr => tgt |
| if (associated(ptr) .eqv. .false.) call abort |
| if (associated(ptr,tgt) .eqv. .false.) call abort |
| end program test_associated |
| </pre></div> |
| |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="NULL.html#NULL">NULL</a> |
| </p></dd> |
| </dl> |
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