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| author | Anas Nashif <anas.nashif@intel.com> | 2012-10-30 12:57:26 -0700 |
|---|---|---|
| committer | Anas Nashif <anas.nashif@intel.com> | 2012-10-30 12:57:26 -0700 |
| commit | 1a78a62555be32868418fe52f8e330c9d0f95d5a (patch) | |
| tree | d3765a80e7d3b9640ec2e930743630cd6b9fce2b /doc/html/foreach/portability.html | |
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Imported Upstream version 1.49.0upstream/1.49.0
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1 files changed, 396 insertions, 0 deletions
diff --git a/doc/html/foreach/portability.html b/doc/html/foreach/portability.html new file mode 100755 index 0000000000..ba35b7c7f6 --- /dev/null +++ b/doc/html/foreach/portability.html @@ -0,0 +1,396 @@ +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> +<title>Portability</title> +<link rel="stylesheet" href="../../../doc/src/boostbook.css" type="text/css"> +<meta name="generator" content="DocBook XSL Stylesheets V1.76.1"> +<link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> +<link rel="up" href="../foreach.html" title="Chapter 8. Boost.Foreach"> +<link rel="prev" href="extensibility.html" title="Extensibility"> +<link rel="next" href="pitfalls.html" title="Pitfalls"> +</head> +<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> +<table cellpadding="2" width="100%"><tr> +<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../boost.png"></td> +<td align="center"><a href="../../../index.html">Home</a></td> +<td align="center"><a href="../../../libs/libraries.htm">Libraries</a></td> +<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> +<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> +<td align="center"><a href="../../../more/index.htm">More</a></td> +</tr></table> +<hr> +<div class="spirit-nav"> +<a accesskey="p" href="extensibility.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../foreach.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="pitfalls.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> +</div> +<div class="section"> +<div class="titlepage"><div><div><h2 class="title" style="clear: both"> +<a name="foreach.portability"></a><a class="link" href="portability.html" title="Portability">Portability</a> +</h2></div></div></div> +<p> + <code class="literal">BOOST_FOREACH</code> uses some fairly sophisticated techniques + that not all compilers support. Depending on how compliant your compiler is, + you may not be able to use <code class="literal">BOOST_FOREACH</code> in some scenarios. + Since <code class="literal">BOOST_FOREACH</code> uses <a href="../../../libs/range/index.html" target="_top">Boost.Range</a>, + it inherits <a href="../../../libs/range/index.html" target="_top">Boost.Range</a>'s + portability issues. You can read about those issues in the <a href="../../../libs/range/doc/html/range/portability.html" target="_top">Boost.Range + Portability</a> section. + </p> +<p> + In addition to the demands placed on the compiler by <a href="../../../libs/range/index.html" target="_top">Boost.Range</a>, + <code class="literal">BOOST_FOREACH</code> places additional demands in order to handle + rvalue sequences properly. (Recall that an rvalue is an unnamed object, so + an example of an rvalue sequence would be a function that returns a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><></span></code> by value.) Compilers vary in their + handling of rvalues and lvalues. To cope with the situation <code class="literal">BOOST_FOREACH</code> + defines three levels of compliance, described below: + </p> +<div class="table"> +<a name="foreach.portability.t0"></a><p class="title"><b>Table 8.1. BOOST_FOREACH Compliance Levels</b></p> +<div class="table-contents"><table class="table" summary="BOOST_FOREACH Compliance Levels"> +<colgroup> +<col> +<col> +</colgroup> +<thead><tr> +<th> + <p> + Level + </p> + </th> +<th> + <p> + Meaning + </p> + </th> +</tr></thead> +<tbody> +<tr> +<td> + <p> + <span class="bold"><strong>Level 0</strong></span> + </p> + </td> +<td> + <p> + <span class="emphasis"><em><span class="underline">Highest level of compliance</span></em></span><br> + <code class="literal">BOOST_FOREACH</code> works with lvalues, rvalues and + const-qualified rvalues. + </p> + </td> +</tr> +<tr> +<td> + <p> + <span class="bold"><strong>Level 1</strong></span> + </p> + </td> +<td> + <p> + <span class="emphasis"><em><span class="underline">Moderate level of compliance</span></em></span><br> + <code class="literal">BOOST_FOREACH</code> works with lvalues and plain rvalues, + but not const-qualified rvalues.<br> <code class="computeroutput"><span class="identifier">BOOST_FOREACH_NO_CONST_RVALUE_DETECTION</span></code> + is defined in this case. + </p> + </td> +</tr> +<tr> +<td> + <p> + <span class="bold"><strong>Level 2</strong></span> + </p> + </td> +<td> + <p> + <span class="emphasis"><em><span class="underline">Lowest level of compliance</span></em></span><br> + <code class="literal">BOOST_FOREACH</code> works with lvalues only, not rvalues.<br> + <code class="computeroutput"><span class="identifier">BOOST_FOREACH_NO_RVALUE_DETECTION</span></code> + is defined in this case. + </p> + </td> +</tr> +</tbody> +</table></div> +</div> +<br class="table-break"><p> + Below are the compilers with which <code class="literal">BOOST_FOREACH</code> has been + tested, and the compliance level <code class="literal">BOOST_FOREACH</code> provides + for them. + </p> +<div class="table"> +<a name="foreach.portability.t1"></a><p class="title"><b>Table 8.2. Compiler Compliance Level</b></p> +<div class="table-contents"><table class="table" summary="Compiler Compliance Level"> +<colgroup> +<col> +<col> +</colgroup> +<thead><tr> +<th> + <p> + Compiler + </p> + </th> +<th> + <p> + Compliance Level + </p> + </th> +</tr></thead> +<tbody> +<tr> +<td> + <p> + Visual C++ 8.0 + </p> + </td> +<td> + <p> + Level 0 + </p> + </td> +</tr> +<tr> +<td> + <p> + Visual C++ 7.1 + </p> + </td> +<td> + <p> + Level 0 + </p> + </td> +</tr> +<tr> +<td> + <p> + Visual C++ 7.0 + </p> + </td> +<td> + <p> + Level 2 + </p> + </td> +</tr> +<tr> +<td> + <p> + Visual C++ 6.0 + </p> + </td> +<td> + <p> + Level 2 + </p> + </td> +</tr> +<tr> +<td> + <p> + gcc 4.0 + </p> + </td> +<td> + <p> + Level 0 + </p> + </td> +</tr> +<tr> +<td> + <p> + gcc 3.4 + </p> + </td> +<td> + <p> + Level 0 + </p> + </td> +</tr> +<tr> +<td> + <p> + gcc 3.3 + </p> + </td> +<td> + <p> + Level 0 + </p> + </td> +</tr> +<tr> +<td> + <p> + mingw 3.4 + </p> + </td> +<td> + <p> + Level 0 + </p> + </td> +</tr> +<tr> +<td> + <p> + Intel for Linux 9.0 + </p> + </td> +<td> + <p> + Level 0 + </p> + </td> +</tr> +<tr> +<td> + <p> + Intel for Windows 9.0 + </p> + </td> +<td> + <p> + Level 0 + </p> + </td> +</tr> +<tr> +<td> + <p> + Intel for Windows 8.0 + </p> + </td> +<td> + <p> + Level 1 + </p> + </td> +</tr> +<tr> +<td> + <p> + Intel for Windows 7.0 + </p> + </td> +<td> + <p> + Level 2 + </p> + </td> +</tr> +<tr> +<td> + <p> + Comeau 4.3.3 + </p> + </td> +<td> + <p> + Level 0 + </p> + </td> +</tr> +<tr> +<td> + <p> + Borland 5.6.4 + </p> + </td> +<td> + <p> + Level 2 + </p> + </td> +</tr> +<tr> +<td> + <p> + Metrowerks 9.5 + </p> + </td> +<td> + <p> + Level 1 + </p> + </td> +</tr> +<tr> +<td> + <p> + Metrowerks 9.4 + </p> + </td> +<td> + <p> + Level 1 + </p> + </td> +</tr> +<tr> +<td> + <p> + SunPro 5.8 + </p> + </td> +<td> + <p> + Level 2 + </p> + </td> +</tr> +<tr> +<td> + <p> + qcc 3.3 + </p> + </td> +<td> + <p> + Level 0 + </p> + </td> +</tr> +<tr> +<td> + <p> + tru64cxx 65 + </p> + </td> +<td> + <p> + Level 2 + </p> + </td> +</tr> +<tr> +<td> + <p> + tru64cxx 71 + </p> + </td> +<td> + <p> + Level 2 + </p> + </td> +</tr> +</tbody> +</table></div> +</div> +<br class="table-break"> +</div> +<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> +<td align="left"></td> +<td align="right"><div class="copyright-footer">Copyright © 2004 Eric Niebler<p> + Distributed under the Boost Software License, Version 1.0. (See accompanying + file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) + </p> +</div></td> +</tr></table> +<hr> +<div class="spirit-nav"> +<a accesskey="p" href="extensibility.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../foreach.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="pitfalls.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> +</div> +</body> +</html> |