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| 25 | <div class="section" lang="en"> |
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| 26 | <div class="titlepage"><div><div><h3 class="title"> |
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| 27 | <a name="function.history"></a>History & Compatibility Notes</h3></div></div></div> |
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| 28 | <div class="itemizedlist"><ul type="disc" compact> |
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| 29 | <li> |
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| 30 | <p><span class="bold"><strong>Version 1.30.0</strong></span>: </p> |
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| 31 | <div class="itemizedlist"><ul type="circle" compact> |
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| 32 | <li><p>All features deprecated in version 1.29.0 have |
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| 33 | been removed from Boost.Function.</p></li> |
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| 34 | <li><p><code class="computeroutput"><a href="../boost/function.html" title="Class template function">boost::function</a></code> |
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| 35 | and <code class="computeroutput"><a href="../functionN.html" title="Class template functionN">boost::functionN</a></code> objects |
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| 36 | can be assigned to 0 (semantically equivalent to calling |
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| 37 | <code class="computeroutput"><a href="../boost/function.html#id2434373-bb">clear</a>()</code>) and |
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| 38 | compared against 0 (semantically equivalent to calling |
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| 39 | <code class="computeroutput"><a href="../boost/function.html#id2396343-bb">empty</a>()</code>).</p></li> |
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| 40 | <li><p>The Boost.Function code is now generated |
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| 41 | entirely by the <a href="../../../libs/preprocessor/index.html" target="_top">Preprocessor</a> library, |
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| 42 | so it is now possible to generate |
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| 43 | <code class="computeroutput"><a href="../boost/function.html" title="Class template function">boost::function</a></code> and |
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| 44 | <code class="computeroutput"><a href="../functionN.html" title="Class template functionN">boost::functionN</a></code> class |
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| 45 | templates for any number of arguments.</p></li> |
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| 46 | <li><p>The |
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| 47 | <code class="computeroutput"><a href="../bad_function_call.html" title="Class bad_function_call">boost::bad_function_call</a></code> exception class |
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| 48 | was introduced.</p></li> |
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| 49 | </ul></div> |
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| 50 | </li> |
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| 51 | <li> |
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| 52 | <p><span class="bold"><strong>Version 1.29.0</strong></span>: |
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| 53 | Boost.Function has been partially redesigned to minimize the |
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| 54 | interface and make it cleaner. Several seldom- or never-used |
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| 55 | features of the older Boost.Function have been deprecated and will |
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| 56 | be removed in the near future. Here is a list of features that have |
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| 57 | been deprecated, the likely impact of the deprecations, and how to |
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| 58 | adjust your code: |
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| 59 | |
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| 60 | </p> |
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| 61 | <div class="itemizedlist"><ul type="circle" compact> |
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| 62 | <li> |
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| 63 | <p>The <code class="computeroutput">boost::function</code> class template syntax has |
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| 64 | changed. The old syntax, e.g., <code class="computeroutput">boost::function<int, float, |
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| 65 | double, std::string></code>, has been changed to a more natural |
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| 66 | syntax <code class="computeroutput">boost::function<int (float, double, |
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| 67 | std::string)></code>, where all return and argument types are |
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| 68 | encoded in a single function type parameter. Any other template |
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| 69 | parameters (e.g., the <code class="computeroutput">Allocator</code>) follow this single |
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| 70 | parameter.</p> |
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| 71 | <p> The resolution to this change depends on the |
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| 72 | abilities of your compiler: if your compiler supports template |
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| 73 | partial specialization and can parse function types (most do), modify |
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| 74 | your code to use the newer |
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| 75 | syntax (preferable) or directly use one of the |
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| 76 | <code class="computeroutput">functionN</code> classes whose syntax has not |
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| 77 | changed. If your compiler does not support template partial |
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| 78 | specialization or function types, you must take the latter option and |
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| 79 | use the numbered Boost.Function classes. This option merely requires |
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| 80 | changing types such as <code class="computeroutput">boost::function<void, int, int></code> |
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| 81 | to <code class="computeroutput">boost::function2<void, int, int></code> (adding the number of |
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| 82 | function arguments to the end of the class name).</p> |
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| 83 | <p> Support for the old syntax with the |
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| 84 | <code class="computeroutput">boost::function</code> class template will persist for a short |
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| 85 | while, but will eventually be removed so that we can provide better |
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| 86 | error messages and link compatibility. </p> |
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| 87 | </li> |
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| 88 | <li><p>The invocation |
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| 89 | policy template parameter (<code class="computeroutput">Policy</code>) has been deprecated |
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| 90 | and will be removed. There is no direct equivalent to this rarely |
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| 91 | used feature.</p></li> |
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| 92 | <li><p>The mixin template parameter |
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| 93 | (<code class="computeroutput">Mixin</code>) has been deprecated and will be removed. There |
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| 94 | is not direct equivalent to this rarely used feature.</p></li> |
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| 95 | <li><p>The |
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| 96 | <code class="computeroutput">set</code> methods have been deprecated and will be |
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| 97 | removed. Use the assignment operator instead.</p></li> |
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| 98 | </ul></div> |
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| 99 | </li> |
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| 100 | </ul></div> |
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| 101 | </div> |
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| 102 | <table width="100%"><tr> |
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| 103 | <td align="left"><small><p>Last revised: January 23, 2005 at 16:23:09 GMT</p></small></td> |
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| 104 | <td align="right"><small>Copyright © 2001-2004 Douglas Gregor</small></td> |
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| 105 | </tr></table> |
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