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| <a name="C_005fSIZEOF-_002d_002d_002d-Size-in-bytes-of-an-expression"></a> |
| <h3 class="section">8.44 <code>C_SIZEOF</code> — Size in bytes of an expression</h3> |
| <a name="index-C_005fSIZEOF"></a> |
| <a name="index-expression-size"></a> |
| <a name="index-size-of-an-expression"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>C_SIZEOF(X)</code> calculates the number of bytes of storage the |
| expression <code>X</code> occupies. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 2008 |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Inquiry function of the module <code>ISO_C_BINDING</code> |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>N = C_SIZEOF(X)</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>X</var></td><td width="70%">The argument shall be an interoperable data entity.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>The return value is of type integer and of the system-dependent kind |
| <code>C_SIZE_T</code> (from the <code>ISO_C_BINDING</code> module). Its value is the |
| number of bytes occupied by the argument. If the argument has the |
| <code>POINTER</code> attribute, the number of bytes of the storage area pointed |
| to is returned. If the argument is of a derived type with <code>POINTER</code> |
| or <code>ALLOCATABLE</code> components, the return value does not account for |
| the sizes of the data pointed to by these components. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample"> use iso_c_binding |
| integer(c_int) :: i |
| real(c_float) :: r, s(5) |
| print *, (c_sizeof(s)/c_sizeof(r) == 5) |
| end |
| </pre></div> |
| <p>The example will print <code>.TRUE.</code> unless you are using a platform |
| where default <code>REAL</code> variables are unusually padded. |
| </p> |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="SIZEOF.html#SIZEOF">SIZEOF</a>, <a href="STORAGE_005fSIZE.html#STORAGE_005fSIZE">STORAGE_SIZE</a> |
| </p></dd> |
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