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| <a name="TRANSFER-_002d_002d_002d-Transfer-bit-patterns"></a> |
| <h3 class="section">8.247 <code>TRANSFER</code> — Transfer bit patterns</h3> |
| <a name="index-TRANSFER"></a> |
| <a name="index-bits_002c-move-1"></a> |
| <a name="index-type-cast"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p>Interprets the bitwise representation of <var>SOURCE</var> in memory as if it |
| is the representation of a variable or array of the same type and type |
| parameters as <var>MOLD</var>. |
| </p> |
| <p>This is approximately equivalent to the C concept of <em>casting</em> one |
| type to another. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 95 and later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Transformational function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>RESULT = TRANSFER(SOURCE, MOLD[, SIZE])</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>SOURCE</var></td><td width="70%">Shall be a scalar or an array of any type.</td></tr> |
| <tr><td width="15%"><var>MOLD</var></td><td width="70%">Shall be a scalar or an array of any type.</td></tr> |
| <tr><td width="15%"><var>SIZE</var></td><td width="70%">(Optional) shall be a scalar of type |
| <code>INTEGER</code>.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>The result has the same type as <var>MOLD</var>, with the bit level |
| representation of <var>SOURCE</var>. If <var>SIZE</var> is present, the result is |
| a one-dimensional array of length <var>SIZE</var>. If <var>SIZE</var> is absent |
| but <var>MOLD</var> is an array (of any size or shape), the result is a one- |
| dimensional array of the minimum length needed to contain the entirety |
| of the bitwise representation of <var>SOURCE</var>. If <var>SIZE</var> is absent |
| and <var>MOLD</var> is a scalar, the result is a scalar. |
| </p> |
| <p>If the bitwise representation of the result is longer than that of |
| <var>SOURCE</var>, then the leading bits of the result correspond to those of |
| <var>SOURCE</var> and any trailing bits are filled arbitrarily. |
| </p> |
| <p>When the resulting bit representation does not correspond to a valid |
| representation of a variable of the same type as <var>MOLD</var>, the results |
| are undefined, and subsequent operations on the result cannot be |
| guaranteed to produce sensible behavior. For example, it is possible to |
| create <code>LOGICAL</code> variables for which <code><var>VAR</var></code> and |
| <code>.NOT.<var>VAR</var></code> both appear to be true. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">PROGRAM test_transfer |
| integer :: x = 2143289344 |
| print *, transfer(x, 1.0) ! prints "NaN" on i686 |
| END PROGRAM |
| </pre></div> |
| </dd> |
| </dl> |
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