157 lines
6.5 KiB
HTML
157 lines
6.5 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1999-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>The GNU Fortran Compiler: TRANSFER</title>
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<meta name="description" content="The GNU Fortran Compiler: TRANSFER">
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<meta name="keywords" content="The GNU Fortran Compiler: TRANSFER">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Intrinsic-Procedures.html#Intrinsic-Procedures" rel="up" title="Intrinsic Procedures">
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<link href="TRANSPOSE.html#TRANSPOSE" rel="next" title="TRANSPOSE">
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<link href="TRAILZ.html#TRAILZ" rel="prev" title="TRAILZ">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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-->
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="TRANSFER"></a>
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<div class="header">
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<p>
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Next: <a href="TRANSPOSE.html#TRANSPOSE" accesskey="n" rel="next">TRANSPOSE</a>, Previous: <a href="TRAILZ.html#TRAILZ" accesskey="p" rel="prev">TRAILZ</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="TRANSFER-_002d_002d_002d-Transfer-bit-patterns"></a>
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<h3 class="section">9.262 <code>TRANSFER</code> — Transfer bit patterns</h3>
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<a name="index-TRANSFER"></a>
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<a name="index-bits_002c-move-1"></a>
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<a name="index-type-cast"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p>Interprets the bitwise representation of <var>SOURCE</var> in memory as if it
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is the representation of a variable or array of the same type and type
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parameters as <var>MOLD</var>.
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</p>
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<p>This is approximately equivalent to the C concept of <em>casting</em> one
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type to another.
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</p>
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</dd>
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<dt><em>Standard</em>:</dt>
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<dd><p>Fortran 95 and later
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</p>
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</dd>
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<dt><em>Class</em>:</dt>
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<dd><p>Transformational function
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><p><code>RESULT = TRANSFER(SOURCE, MOLD[, SIZE])</code>
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</p>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>SOURCE</var></td><td width="70%">Shall be a scalar or an array of any type.</td></tr>
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<tr><td width="15%"><var>MOLD</var></td><td width="70%">Shall be a scalar or an array of any type.</td></tr>
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<tr><td width="15%"><var>SIZE</var></td><td width="70%">(Optional) shall be a scalar of type
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<code>INTEGER</code>.</td></tr>
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</table>
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</dd>
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<dt><em>Return value</em>:</dt>
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<dd><p>The result has the same type as <var>MOLD</var>, with the bit level
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representation of <var>SOURCE</var>. If <var>SIZE</var> is present, the result is
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a one-dimensional array of length <var>SIZE</var>. If <var>SIZE</var> is absent
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but <var>MOLD</var> is an array (of any size or shape), the result is a one-
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dimensional array of the minimum length needed to contain the entirety
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of the bitwise representation of <var>SOURCE</var>. If <var>SIZE</var> is absent
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and <var>MOLD</var> is a scalar, the result is a scalar.
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</p>
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<p>If the bitwise representation of the result is longer than that of
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<var>SOURCE</var>, then the leading bits of the result correspond to those of
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<var>SOURCE</var> and any trailing bits are filled arbitrarily.
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</p>
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<p>When the resulting bit representation does not correspond to a valid
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representation of a variable of the same type as <var>MOLD</var>, the results
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are undefined, and subsequent operations on the result cannot be
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guaranteed to produce sensible behavior. For example, it is possible to
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create <code>LOGICAL</code> variables for which <code><var>VAR</var></code> and
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<code>.NOT.<var>VAR</var></code> both appear to be true.
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</p>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><div class="smallexample">
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<pre class="smallexample">PROGRAM test_transfer
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integer :: x = 2143289344
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print *, transfer(x, 1.0) ! prints "NaN" on i686
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END PROGRAM
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</pre></div>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="TRANSPOSE.html#TRANSPOSE" accesskey="n" rel="next">TRANSPOSE</a>, Previous: <a href="TRAILZ.html#TRAILZ" accesskey="p" rel="prev">TRAILZ</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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