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<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="hash.changes"></a><a class="link" href="changes.html" title="Change Log">Change Log</a>
</h2></div></div></div>
<h3>
<a name="hash.changes.h0"></a>
<span><a name="hash.changes.boost_1_33_0"></a></span><a class="link" href="changes.html#hash.changes.boost_1_33_0">Boost
1.33.0</a>
</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
Initial Release
</li></ul></div>
<h3>
<a name="hash.changes.h1"></a>
<span><a name="hash.changes.boost_1_33_1"></a></span><a class="link" href="changes.html#hash.changes.boost_1_33_1">Boost
1.33.1</a>
</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
Fixed the points example, as pointed out by 沈慧峰.
</li></ul></div>
<h3>
<a name="hash.changes.h2"></a>
<span><a name="hash.changes.boost_1_34_0"></a></span><a class="link" href="changes.html#hash.changes.boost_1_34_0">Boost
1.34.0</a>
</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Use declarations for standard classes, so that the library doesn't need
to include all of their headers
</li>
<li class="listitem">
Deprecated the <code class="computeroutput"><span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">functional</span><span class="special">/</span><span class="identifier">hash</span><span class="comment">/*.hpp></span></code> headers. Now a single header,
<<code class="computeroutput"><a class="link" href="reference.html#header.boost.functional.hash_hpp" title="Header <boost/functional/hash.hpp>">boost/functional/hash.hpp</a></code>>
is used.
</li>
<li class="listitem">
Add support for the <code class="computeroutput"><span class="identifier">BOOST_HASH_NO_EXTENSIONS</span></code>
macro, which disables the extensions to TR1.
</li>
<li class="listitem">
Minor improvements to the hash functions for floating point numbers.
</li>
<li class="listitem">
Update the portable example to hopefully be more generally portable.
</li>
</ul></div>
<h3>
<a name="hash.changes.h3"></a>
<span><a name="hash.changes.boost_1_34_1"></a></span><a class="link" href="changes.html#hash.changes.boost_1_34_1">Boost
1.34.1</a>
</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<a href="http://svn.boost.org/trac/boost/ticket/952" target="_top">Ticket 952</a>:
Suppress incorrect 64-bit warning on Visual C++.
</li></ul></div>
<h3>
<a name="hash.changes.h4"></a>
<span><a name="hash.changes.boost_1_35_0"></a></span><a class="link" href="changes.html#hash.changes.boost_1_35_0">Boost
1.35.0</a>
</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Support for <code class="computeroutput"><span class="keyword">long</span> <span class="keyword">long</span></code>,
<code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">complex</span></code>.
</li>
<li class="listitem">
Improved algorithm for hashing floating point numbers:
<div class="itemizedlist"><ul class="itemizedlist" type="circle">
<li class="listitem">
Improved portablity, as described by Daniel Krügler in <a href="http://lists.boost.org/boost-users/2005/08/13418.php" target="_top">a
post to the boost users list</a>.
</li>
<li class="listitem">
Fits more information into each combine loop, which can reduce the
the number of times combine is called and hopefully give a better
quality hash function.
</li>
<li class="listitem">
Improved the algorithm for hashing floating point numbers.
</li>
<li class="listitem">
On Cygwin use a binary hash function for floating point numbers,
as Cygwin doesn't have decent floating point functions for <code class="computeroutput"><span class="keyword">long</span> <span class="keyword">double</span></code>.
</li>
<li class="listitem">
Never uses <code class="computeroutput"><span class="identifier">fpclass</span></code>
which doesn't support <code class="computeroutput"><span class="keyword">long</span>
<span class="keyword">double</span></code>.
</li>
<li class="listitem">
<a href="http://svn.boost.org/trac/boost/ticket/1064" target="_top">Ticket 1064</a>:
Removed unnecessary use of <code class="computeroutput"><span class="identifier">errno</span></code>.
</li>
</ul></div>
</li>
<li class="listitem">
Explicitly overload for more built in types.
</li>
<li class="listitem">
Minor improvements to the documentation.
</li>
<li class="listitem">
A few bug and warning fixes:
<div class="itemizedlist"><ul class="itemizedlist" type="circle">
<li class="listitem">
<a href="http://svn.boost.org/trac/boost/ticket/1509" target="_top">Ticket 1509</a>:
Suppress another Visual C++ warning.
</li>
<li class="listitem">
Some workarounds for the Sun compilers.
</li>
</ul></div>
</li>
</ul></div>
<h3>
<a name="hash.changes.h5"></a>
<span><a name="hash.changes.boost_1_36_0"></a></span><a class="link" href="changes.html#hash.changes.boost_1_36_0">Boost
1.36.0</a>
</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Stop using OpenBSD's dodgy <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">numeric_limits</span></code>.
</li>
<li class="listitem">
Using the boost typedefs for <code class="computeroutput"><span class="keyword">long</span>
<span class="keyword">long</span></code> and <code class="computeroutput"><span class="keyword">unsigned</span>
<span class="keyword">long</span> <span class="keyword">long</span></code>.
</li>
<li class="listitem">
Move the extensions into their own header.
</li>
</ul></div>
<h3>
<a name="hash.changes.h6"></a>
<span><a name="hash.changes.boost_1_37_0"></a></span><a class="link" href="changes.html#hash.changes.boost_1_37_0">Boost
1.37.0</a>
</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<a href="http://svn.boost.org/trac/boost/ticket/2264" target="_top">Ticket 2264</a>:
In Visual C++, always use C99 float functions for <code class="computeroutput"><span class="keyword">long</span>
<span class="keyword">double</span></code> and <code class="computeroutput"><span class="keyword">float</span></code>
as the C++ overloads aren't always availables.
</li></ul></div>
<h3>
<a name="hash.changes.h7"></a>
<span><a name="hash.changes.boost_1_38_0"></a></span><a class="link" href="changes.html#hash.changes.boost_1_38_0">Boost
1.38.0</a>
</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Changed the warnings in the deprecated headers from 1.34.0 to errors. These
will be removed in a future version of Boost.
</li>
<li class="listitem">
Moved detail headers out of <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">functional</span><span class="special">/</span><span class="identifier">detail</span></code>,
since they are part of functional/hash, not functional. <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">functional</span><span class="special">/</span><span class="identifier">detail</span><span class="special">/</span><span class="identifier">container_fwd</span><span class="special">.</span><span class="identifier">hpp</span></code>
has been moved to <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">detail</span><span class="special">/</span><span class="identifier">container_fwd</span><span class="special">.</span><span class="identifier">hpp</span></code>
as it's used outside of this library, the others have been moved to <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">functional</span><span class="special">/</span><span class="identifier">hash</span><span class="special">/</span><span class="identifier">detail</span></code>.
</li>
</ul></div>
<h3>
<a name="hash.changes.h8"></a>
<span><a name="hash.changes.boost_1_39_0"></a></span><a class="link" href="changes.html#hash.changes.boost_1_39_0">Boost
1.39.0</a>
</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Move the hash_fwd.hpp implementation into the hash subdirectory, leaving
a forwarding header in the old location. You should still use the old location,
the new location is mainly for implementation and possible modularization.
</li>
<li class="listitem">
<a href="https://svn.boost.org/trac/boost/ticket/2412" target="_top">Ticket 2412</a>:
Removed deprecated headers.
</li>
<li class="listitem">
<a href="https://svn.boost.org/trac/boost/ticket/2957" target="_top">Ticket 2957</a>:
Fix configuration for vxworks.
</li>
</ul></div>
<h3>
<a name="hash.changes.h9"></a>
<span><a name="hash.changes.boost_1_40_0"></a></span><a class="link" href="changes.html#hash.changes.boost_1_40_0">Boost
1.40.0</a>
</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Automatically configure the float functions using template metaprogramming
instead of trying to configure every possibility manually.
</li>
<li class="listitem">
Workaround for when STLport doesn't support long double.
</li>
</ul></div>
<h3>
<a name="hash.changes.h10"></a>
<span><a name="hash.changes.boost_1_42_0"></a></span><a class="link" href="changes.html#hash.changes.boost_1_42_0">Boost
1.42.0</a>
</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Reduce the number of warnings for Visual C++ warning level 4.
</li>
<li class="listitem">
Some code formatting changes to fit lines into 80 characters.
</li>
<li class="listitem">
Rename an internal namespace.
</li>
</ul></div>
<h3>
<a name="hash.changes.h11"></a>
<span><a name="hash.changes.boost_1_43_0"></a></span><a class="link" href="changes.html#hash.changes.boost_1_43_0">Boost
1.43.0</a>
</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<a href="https://svn.boost.org/trac/boost/ticket/3866" target="_top">Ticket 3866</a>:
Don't foward declare containers when using gcc's parallel library, allow
user to stop forward declaration by defining the <code class="computeroutput"><span class="identifier">BOOST_DETAIL_NO_CONTAINER_FWD</span></code>
macro.
</li>
<li class="listitem">
<a href="https://svn.boost.org/trac/boost/ticket/4038" target="_top">Ticket 4038</a>:
Avoid hashing 0.5 and 0 to the same number.
</li>
<li class="listitem">
Stop using deprecated <code class="computeroutput"><span class="identifier">BOOST_HAS_</span><span class="special">*</span></code> macros.
</li>
</ul></div>
<h3>
<a name="hash.changes.h12"></a>
<span><a name="hash.changes.boost_1_44_0"></a></span><a class="link" href="changes.html#hash.changes.boost_1_44_0">Boost
1.44.0</a>
</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
Add option to prevent implicit conversions when calling <code class="computeroutput"><span class="identifier">hash_value</span></code>
by defining <code class="computeroutput"><span class="identifier">BOOST_HASH_NO_IMPLICIT_CASTS</span></code>.
When using <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">hash</span></code> for a type that does not have <code class="computeroutput"><span class="identifier">hash_value</span></code> declared but does have an
implicit conversion to a type that does, it would use that implicit conversion
to hash it. Which can sometimes go very wrong, e.g. using a conversion
to bool and only hashing to 2 possible values. Since fixing this is a breaking
change and was only approached quite late in the release cycle with little
discussion it's opt-in for now. This, or something like it, will become
the default in a future version.
</li></ul></div>
<h3>
<a name="hash.changes.h13"></a>
<span><a name="hash.changes.boost_1_46_0"></a></span><a class="link" href="changes.html#hash.changes.boost_1_46_0">Boost
1.46.0</a>
</h3>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
Avoid warning due with gcc's <code class="computeroutput"><span class="special">-</span><span class="identifier">Wconversion</span></code> flag.
</li></ul></div>
</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 © 2005-2008 Daniel
James<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>
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