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| <title>The GNU Fortran Compiler: C_F_POINTER</title> |
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| <a name="C_005fF_005fPOINTER-_002d_002d_002d-Convert-C-into-Fortran-pointer"></a> |
| <h3 class="section">9.49 <code>C_F_POINTER</code> — Convert C into Fortran pointer</h3> |
| <a name="index-C_005fF_005fPOINTER"></a> |
| <a name="index-pointer_002c-convert-C-to-Fortran"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>C_F_POINTER(CPTR, FPTR[, SHAPE])</code> assigns the target of the C pointer |
| <var>CPTR</var> to the Fortran pointer <var>FPTR</var> and specifies its shape. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 2003 and later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Subroutine |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>CALL C_F_POINTER(CPTR, FPTR[, SHAPE])</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>CPTR</var></td><td width="70%">scalar of the type <code>C_PTR</code>. It is |
| <code>INTENT(IN)</code>.</td></tr> |
| <tr><td width="15%"><var>FPTR</var></td><td width="70%">pointer interoperable with <var>cptr</var>. It is |
| <code>INTENT(OUT)</code>.</td></tr> |
| <tr><td width="15%"><var>SHAPE</var></td><td width="70%">(Optional) Rank-one array of type <code>INTEGER</code> |
| with <code>INTENT(IN)</code>. It shall be present |
| if and only if <var>fptr</var> is an array. The size |
| must be equal to the rank of <var>fptr</var>.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program main |
| use iso_c_binding |
| implicit none |
| interface |
| subroutine my_routine(p) bind(c,name='myC_func') |
| import :: c_ptr |
| type(c_ptr), intent(out) :: p |
| end subroutine |
| end interface |
| type(c_ptr) :: cptr |
| real,pointer :: a(:) |
| call my_routine(cptr) |
| call c_f_pointer(cptr, a, [12]) |
| end program main |
| </pre></div> |
| |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="C_005fLOC.html#C_005fLOC">C_LOC</a>, <a href="C_005fF_005fPROCPOINTER.html#C_005fF_005fPROCPOINTER">C_F_PROCPOINTER</a> |
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