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| <title>The GNU Fortran Compiler: C_LOC</title> |
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| <a name="C_005fLOC-_002d_002d_002d-Obtain-the-C-address-of-an-object"></a> |
| <h3 class="section">8.43 <code>C_LOC</code> — Obtain the C address of an object</h3> |
| <a name="index-C_005fLOC"></a> |
| <a name="index-procedure-pointer_002c-convert-C-to-Fortran"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>C_LOC(X)</code> determines the C address of the argument. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 2003 and later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Inquiry function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>RESULT = C_LOC(X)</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="10%"><var>X</var></td><td width="75%">Shall have either the POINTER or TARGET attribute. It shall not be a coindexed object. It shall either be a variable with interoperable type and kind type parameters, or be a scalar, nonpolymorphic variable with no length type parameters.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>The return value is of type <code>C_PTR</code> and contains the C address |
| of the argument. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">subroutine association_test(a,b) |
| use iso_c_binding, only: c_associated, c_loc, c_ptr |
| implicit none |
| real, pointer :: a |
| type(c_ptr) :: b |
| if(c_associated(b, c_loc(a))) & |
| stop 'b and a do not point to same target' |
| end subroutine association_test |
| </pre></div> |
| |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="C_005fASSOCIATED.html#C_005fASSOCIATED">C_ASSOCIATED</a>, <a href="C_005fFUNLOC.html#C_005fFUNLOC">C_FUNLOC</a>, <a href="C_005fF_005fPOINTER.html#C_005fF_005fPOINTER">C_F_POINTER</a>, <a href="C_005fF_005fPROCPOINTER.html#C_005fF_005fPROCPOINTER">C_F_PROCPOINTER</a> |
| </p></dd> |
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