| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> |
| <title>History & Compatibility Notes</title> |
| <link rel="stylesheet" href="../../../doc/src/boostbook.css" type="text/css"> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> |
| <link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> |
| <link rel="up" href="../function.html" title="Chapter 7. Boost.Function"> |
| <link rel="prev" href="../function.html" title="Chapter 7. Boost.Function"> |
| <link rel="next" href="tutorial.html" title="Tutorial"> |
| </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="../function.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../function.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="tutorial.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="function.history"></a>History & Compatibility Notes</h2></div></div></div> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc" compact> |
| <li class="listitem"> |
| <p><span class="bold"><strong>Version 1.37.0</strong></span>: </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="circle" compact> |
| <li class="listitem"><p>Improved the performance of Boost.Function's |
| swap() operation for large function objects. Original patch |
| contributed by Niels Dekker.</p></li> |
| <li class="listitem"><p>Added a new header <boost/function/function_typeof.hpp> that provides support for using the Boost.Typeof library on Boost.Function objects.</p></li> |
| <li class="listitem"><p>Added a new header <boost/function/function_fwd.hpp> that provides support for using the Boost.Typeof library on Boost.Function objects.</p></li> |
| <li class="listitem"><p>The <code class="computeroutput"><a class="link" href="../boost/function.html#id462607-bb">target</a></code>() |
| function now respects the cv-qualifiers of function objects |
| stored by reference |
| (using <code class="computeroutput"><a class="link" href="../boost/reference_wrapper.html" title="Class template reference_wrapper">boost::reference_wrapper</a></code>), such |
| that a reference to a <code class="computeroutput">const</code> function object cannot |
| be accessed as a reference to a non-<code class="computeroutput">const</code> function |
| object.</p></li> |
| </ul></div> |
| </li> |
| <li class="listitem"> |
| <p><span class="bold"><strong>Version 1.36.0</strong></span>: </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="circle" compact><li class="listitem"><p>Boost.Function now implements allocator support |
| in the same way that is is provided in C++0x, based on C++ |
| committee |
| proposal <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2308.html" target="_top">N2308</a>. This |
| change removes the <code class="computeroutput">Allocator</code> |
| template parameter of <code class="computeroutput"><a class="link" href="../boost/function.html" title="Class template function">boost::function</a></code> in |
| favor of a constructor that takes an argument. While this is a |
| backward-incompatible change, it is likely to affect only a few |
| users. This change to Function was contributed by Emil |
| Dotchevski, which also authored the corresponding C++ committee |
| proposal.</p></li></ul></div> |
| </li> |
| <li class="listitem"> |
| <p><span class="bold"><strong>Version 1.34.0</strong></span>: </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="circle" compact><li class="listitem"><p>Boost.Function now implements a small buffer optimization, which can drastically improve the performance when copying or construction Boost.Function objects storing small function objects. For instance, <code class="computeroutput">bind(&X:foo, &x, _1, _2)</code> requires no heap allocation when placed into a Boost.Function object. Note that some exception-safety guarantees have changed: assignment provides the basic exception guarantee and <code class="computeroutput">swap()</code> may throw.</p></li></ul></div> |
| </li> |
| <li class="listitem"> |
| <p><span class="bold"><strong>Version 1.30.0</strong></span>: </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="circle" compact> |
| <li class="listitem"><p>All features deprecated in version 1.29.0 have |
| been removed from Boost.Function.</p></li> |
| <li class="listitem"><p><code class="computeroutput"><a class="link" href="../boost/function.html" title="Class template function">boost::function</a></code> |
| and <code class="computeroutput"><a class="link" href="../boost/functionN.html" title="Class template functionN">boost::functionN</a></code> objects |
| can be assigned to 0 (semantically equivalent to calling |
| <code class="computeroutput"><a class="link" href="../boost/function.html#id375935-bb">clear</a>()</code>) and |
| compared against 0 (semantically equivalent to calling |
| <code class="computeroutput"><a class="link" href="../boost/function.html#id344924-bb">empty</a>()</code>).</p></li> |
| <li class="listitem"><p>The Boost.Function code is now generated |
| entirely by the <a href="../../../libs/preprocessor/index.html" target="_top">Preprocessor</a> library, |
| so it is now possible to generate |
| <code class="computeroutput"><a class="link" href="../boost/function.html" title="Class template function">boost::function</a></code> and |
| <code class="computeroutput"><a class="link" href="../boost/functionN.html" title="Class template functionN">boost::functionN</a></code> class |
| templates for any number of arguments.</p></li> |
| <li class="listitem"><p>The |
| <code class="computeroutput"><a class="link" href="../boost/bad_function_call.html" title="Class bad_function_call">boost::bad_function_call</a></code> exception class |
| was introduced.</p></li> |
| </ul></div> |
| </li> |
| <li class="listitem"> |
| <p><span class="bold"><strong>Version 1.29.0</strong></span>: |
| Boost.Function has been partially redesigned to minimize the |
| interface and make it cleaner. Several seldom- or never-used |
| features of the older Boost.Function have been deprecated and will |
| be removed in the near future. Here is a list of features that have |
| been deprecated, the likely impact of the deprecations, and how to |
| adjust your code: |
| |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="circle" compact> |
| <li class="listitem"> |
| <p>The <code class="computeroutput">boost::function</code> class template syntax has |
| changed. The old syntax, e.g., <code class="computeroutput">boost::function<int, float, |
| double, std::string></code>, has been changed to a more natural |
| syntax <code class="computeroutput">boost::function<int (float, double, |
| std::string)></code>, where all return and argument types are |
| encoded in a single function type parameter. Any other template |
| parameters (e.g., the <code class="computeroutput">Allocator</code>) follow this single |
| parameter.</p> |
| <p> The resolution to this change depends on the |
| abilities of your compiler: if your compiler supports template |
| partial specialization and can parse function types (most do), modify |
| your code to use the newer |
| syntax (preferable) or directly use one of the |
| <code class="computeroutput">functionN</code> classes whose syntax has not |
| changed. If your compiler does not support template partial |
| specialization or function types, you must take the latter option and |
| use the numbered Boost.Function classes. This option merely requires |
| changing types such as <code class="computeroutput">boost::function<void, int, int></code> |
| to <code class="computeroutput">boost::function2<void, int, int></code> (adding the number of |
| function arguments to the end of the class name).</p> |
| <p> Support for the old syntax with the |
| <code class="computeroutput">boost::function</code> class template will persist for a short |
| while, but will eventually be removed so that we can provide better |
| error messages and link compatibility. </p> |
| </li> |
| <li class="listitem"><p>The invocation |
| policy template parameter (<code class="computeroutput">Policy</code>) has been deprecated |
| and will be removed. There is no direct equivalent to this rarely |
| used feature.</p></li> |
| <li class="listitem"><p>The mixin template parameter |
| (<code class="computeroutput">Mixin</code>) has been deprecated and will be removed. There |
| is not direct equivalent to this rarely used feature.</p></li> |
| <li class="listitem"><p>The |
| <code class="computeroutput">set</code> methods have been deprecated and will be |
| removed. Use the assignment operator instead.</p></li> |
| </ul></div> |
| <p> |
| </p> |
| </li> |
| </ul></div> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <td align="left"><p><small>Last revised: October 16, 2008 at 14:21:50 +0100</small></p></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2001-2004 Douglas Gregor<p>Use, modification and distribution is subject to the Boost |
| Software License, Version 1.0. (See accompanying file |
| <code class="filename">LICENSE_1_0.txt</code> 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="../function.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../function.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="tutorial.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| </body> |
| </html> |
