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  1. <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>History &amp; Compatibility Notes</title><link rel="stylesheet" href="reference.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.61.3"><link rel="home" href="index.html" title="The Boost C++ Libraries"><link rel="up" href="function.html" title="Boost.Function"><link rel="previous" href="function.html" title="Boost.Function"><link rel="next" href="function.tutorial.html" title="Tutorial"><link rel="chapter" href="libraries.html" title="The Boost C++ Libraries"><link rel="chapter" href="any.html" title="Boost.Any"><link rel="refentry" href="class.boost.bad_any_cast.html" title="Class bad_any_cast"><link rel="refentry" href="class.boost.any.html" title="Class any"><link rel="refentry" href="id2383300-bb.html" title="Function any_cast"><link rel="chapter" href="array.html" title="Boost.Array"><link rel="refentry" href="class.boost.array.html" title="Class template 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  73.           BoostBook element rationale"><link rel="refentry" href="Assignable.html" title="Concept Assignable"><link rel="refentry" href="InputIterator.html" title="Concept InputIterator"><link rel="refentry" href="OutputIterator.html" title="Concept OutputIterator"><link rel="refentry" href="ForwardIterator.html" title="Concept ForwardIterator"><link rel="refentry" href="BidirectionalIterator.html" title="Concept BidirectionalIterator"><link rel="refentry" href="RandomAccessIterator.html" title="Concept RandomAccessIterator"><link rel="refentry" href="DefaultConstructible.html" title="Concept DefaultConstructible"><link rel="refentry" href="CopyConstructible.html" title="Concept CopyConstructible"><link rel="refentry" href="EqualityComparable.html" title="Concept EqualityComparable"><link rel="refentry" href="LessThanComparable.html" title="Concept LessThanComparable"><link rel="refentry" href="SignedInteger.html" title="Concept SignedInteger"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" border="1" cellpadding="2" bgcolor="#007F7F"><tr><td bgcolor="#FFFFFF"><img src="../../c++boost.gif" alt="c++boost.gif (8819 bytes)" width="277" height="86"></td><td><a href="../../index.htm"><font color="#FFFFFF" size="4" face="Arial">Home</font></a></td><td><a href="libraries.html"><font color="#FFFFFF" size="4" face="Arial">Libraries</font></a></td><td><a href="../../people/people.htm"><font color="#FFFFFF" size="4" face="Arial">People</font></a></td><td><a href="../../more/faq.htm"><font color="#FFFFFF" size="4" face="Arial">FAQ</font></a></td><td><a href="../../more/index.htm"><font color="#FFFFFF" size="4" face="Arial">More</font></a></td></tr></table><div class="section" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="function.history"></a>History &amp; Compatibility Notes</h3></div></div><div></div></div><div class="itemizedlist"><ul type="disc" compact><li><p><span class="bold"><b>Version 1.30.0</b></span>: </p><div class="itemizedlist"><ul type="circle" compact><li><p>All features deprecated in version 1.29.0 have
    74. 

  74.       been removed from Boost.Function.</p></li><li><p><tt class="computeroutput"><a href="class.boost.function.html" title="Class template function">boost::function</a></tt>
    75. 

  75.       and <tt class="computeroutput"><a href="class.boost.functionN.html" title="Class template functionN">boost::functionN</a></tt> objects
    76. 

  76.       can be assigned to 0 (semantically equivalent to calling
    77. 

  77.       <tt class="computeroutput"><a href="class.boost.function.html#id2465894-bb">clear</a>()</tt>) and
    78. 

  78.       compared against 0 (semantically equivalent to calling
    79. 

  79.       <tt class="computeroutput"><a href="class.boost.function.html#id2432398-bb">empty</a>()</tt>).</p></li><li><p>The Boost.Function code is now generated
    80. 

  80.       entirely by the <a href="../../libs/preprocessor/index.html" target="_top">Preprocessor</a> library,
    81. 

  81.       so it is now possible to generate
    82. 

  82.       <tt class="computeroutput"><a href="class.boost.function.html" title="Class template function">boost::function</a></tt> and
    83. 

  83.       <tt class="computeroutput"><a href="class.boost.functionN.html" title="Class template functionN">boost::functionN</a></tt> class
    84. 

  84.       templates for any number of arguments.</p></li><li><p>The
    85. 

  85.       <a href="class.boost.bad_function_call.html" title="Class bad_function_call">boost::bad_function_call</a> exception class
    86. 

  86.       was introduced.</p></li></ul></div></li><li><p><span class="bold"><b>Version 1.29.0</b></span>:
    87. 

  87.   Boost.Function has been partially redesigned to minimize the
    88. 

  88.   interface and make it cleaner. Several seldom- or never-used
    89. 

  89.   features of the older Boost.Function have been deprecated and will
    90. 

  90.   be removed in the near future. Here is a list of features that have
    91. 

  91.   been deprecated, the likely impact of the deprecations, and how to
    92. 

  92.   adjust your code:
    93. 

  93. 

  94. </p><div class="itemizedlist"><ul type="circle" compact><li><p>The <tt class="computeroutput">boost::function</tt> class template syntax has
    95. 

  95.   changed. The old syntax, e.g., <tt class="computeroutput">boost::function&lt;int, float,
    96. 

  96.   double, std::string&gt;</tt>, has been changed to a more natural
    97. 

  97.   syntax <tt class="computeroutput">boost::function&lt;int (float, double,
    98. 

  98.   std::string)&gt;</tt>, where all return and argument types are
    99. 

  99.   encoded in a single function type parameter. Any other template
    100. 

  100.   parameters (e.g., the <tt class="computeroutput">Allocator</tt>) follow this single
    101. 

  101.   parameter.</p><p> The resolution to this change depends on the
    102. 

  102.   abilities of your compiler: if your compiler supports template
    103. 

  103.   partial specialization and can parse function types (most do), modify 
    104. 

  104.   your code to use the newer
    105. 

  105.   syntax (preferable) or directly use one of the
    106. 

  106.   <tt class="computeroutput">functionN</tt> classes whose syntax has not
    107. 

  107.   changed. If your compiler does not support template partial
    108. 

  108.   specialization or function types, you must take the latter option and 
    109. 

  109.   use the numbered Boost.Function classes. This option merely requires 
    110. 

  110.   changing types such as <tt class="computeroutput">boost::function&lt;void, int, int&gt;</tt>
    111. 

  111.   to <tt class="computeroutput">boost::function2&lt;void, int, int&gt;</tt> (adding the number of
    112. 

  112.   function arguments to the end of the class name).</p><p> Support for the old syntax with the
    113. 

  113.   <tt class="computeroutput">boost::function</tt> class template will persist for a short
    114. 

  114.   while, but will eventually be removed so that we can provide better
    115. 

  115.   error messages and link compatibility. </p></li><li><p>The invocation
    116. 

  116.   policy template parameter (<tt class="computeroutput">Policy</tt>) has been deprecated
    117. 

  117.   and will be removed. There is no direct equivalent to this rarely
    118. 

  118.   used feature.</p></li><li><p>The mixin template parameter
    119. 

  119.   (<tt class="computeroutput">Mixin</tt>) has been deprecated and will be removed. There
    120. 

  120.   is not direct equivalent to this rarely used feature.</p></li><li><p>The
    121. 

  121.   <tt class="computeroutput">set</tt> methods have been deprecated and will be
    122. 

  122.   removed. Use the assignment operator instead.</p></li></ul></div></li></ul></div></div><table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr><td align="left"><small>Last revised: March 12, 2003 at 23:27:22 GMT</small></td><td align="right"><small>Copyright © 2001-2003 Douglas Gregor</small></td></tr></table><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="function.html"><img src="images/prev.png" alt="Prev"></a> </td><td width="20%" align="center"><a accesskey="u" href="function.html"><img src="images/up.png" alt="Up"></a></td><td width="40%" align="right"> <a accesskey="n" href="function.tutorial.html"><img src="images/next.png" alt="Next"></a></td></tr><tr><td width="40%" align="left" valign="top">Boost.Function </td><td width="20%" align="center"><a accesskey="h" href="index.html"><img src="images/home.png" alt="Home"></a></td><td width="40%" align="right" valign="top"> Tutorial</td></tr></table></div></body></html>
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