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<h3 class="section">8.40 <code>C_LOC</code> — Obtain the C address of an object</h3>
<p><a name="index-C_005fLOC-477"></a><a name="index-procedure-pointer_002c-convert-C-to-Fortran-478"></a>
<dl>
<dt><em>Description</em>:<dd><code>C_LOC(X)</code> determines the C address of the argument.
<br><dt><em>Standard</em>:<dd>Fortran 2003 and later
<br><dt><em>Class</em>:<dd>Inquiry function
<br><dt><em>Syntax</em>:<dd><code>RESULT = C_LOC(X)</code>
<br><dt><em>Arguments</em>:<dd>
<p><table summary=""><tr align="left"><td valign="top" width="10%"><var>X</var> </td><td valign="top" 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.
<br></td></tr></table>
<br><dt><em>Return value</em>:<dd>The return value is of type <code>C_PTR</code> and contains the C address
of the argument.
<br><dt><em>Example</em>:<dd>
<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>
<br><dt><em>See also</em>:<dd><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>
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