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<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="boost_lexical_cast.changes"></a><a class="link" href="changes.html" title="Changes">Changes</a>
</h2></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<span class="bold"><strong>boost 1.49.0 :</strong></span>
<div class="itemizedlist"><ul class="itemizedlist" type="circle">
<li class="listitem">
Restored work with typedefed wchar_t (compilation flag /Zc:wchar_t-
for Visual Studio).
</li>
<li class="listitem">
Better performance and less memory usage for <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">container</span><span class="special">::</span><span class="identifier">basic_string</span></code>
conversions.
</li>
</ul></div>
</li>
<li class="listitem">
<span class="bold"><strong>boost 1.48.0 :</strong></span>
<div class="itemizedlist"><ul class="itemizedlist" type="circle">
<li class="listitem">
Added code to work with Inf and NaN on any platform.
</li>
<li class="listitem">
Better performance and less memory usage for conversions to float
type (and to double type, if <code class="computeroutput"><span class="keyword">sizeof</span><span class="special">(</span><span class="keyword">double</span><span class="special">)</span> <span class="special"><</span> <span class="keyword">sizeof</span><span class="special">(</span><span class="keyword">long</span> <span class="keyword">double</span><span class="special">)</span></code>).
</li>
</ul></div>
</li>
<li class="listitem">
<span class="bold"><strong>boost 1.47.0 :</strong></span>
<div class="itemizedlist"><ul class="itemizedlist" type="circle">
<li class="listitem">
Optimizations for "C" and other locales without number
grouping.
</li>
<li class="listitem">
Better performance and less memory usage for unsigned char and signed
char conversions.
</li>
<li class="listitem">
Better performance and less memory usage for conversions to arithmetic
types.
</li>
<li class="listitem">
Better performance and less memory usage for conversions from arithmetic
type to arithmetic type.
</li>
<li class="listitem">
Directly construct Target from Source on some conversions (like conversions
from string to string, from char array to string, from char to char
and others).
</li>
</ul></div>
</li>
<li class="listitem">
<span class="bold"><strong>boost 1.34.0 :</strong></span>
<div class="itemizedlist"><ul class="itemizedlist" type="circle"><li class="listitem">
Better performance for many combinations of Source and Target types.
For more details refer to Alexander Nasonovs article <a href="http://accu.org/index.php/journals/1375" target="_top">Fine
Tuning for lexical_cast, Overload #74, August 2006</a> <a href="http://www.accu.org/var/uploads/journals/overload74.pdf" target="_top">(PDF)</a>.
</li></ul></div>
</li>
<li class="listitem">
<span class="bold"><strong>boost 1.33.0 :</strong></span>
<div class="itemizedlist"><ul class="itemizedlist" type="circle">
<li class="listitem">
Call-by-const reference for the parameters. This requires partial
specialization of class templates, so it doesn't work for MSVC 6,
and it uses the original pass by value there.
</li>
<li class="listitem">
The MSVC 6 support is deprecated, and will be removed in a future
Boost version.
</li>
</ul></div>
</li>
<li class="listitem">
<span class="bold"><strong>Earlier :</strong></span>
<div class="itemizedlist"><ul class="itemizedlist" type="circle">
<li class="listitem">
The previous version of lexical_cast used the default stream precision
for reading and writing floating-point numbers. For numerics that
have a corresponding specialization of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">numeric_limits</span></code>,
the current version now chooses a precision to match.
</li>
<li class="listitem">
The previous version of lexical_cast did not support conversion to
or from any wide-character-based types. For compilers with full language
and library support for wide characters, <code class="computeroutput"><span class="identifier">lexical_cast</span></code>
now supports conversions from <code class="computeroutput"><span class="keyword">wchar_t</span></code>,
<code class="computeroutput"><span class="keyword">wchar_t</span> <span class="special">*</span></code>,
and <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">wstring</span></code> and to <code class="computeroutput"><span class="keyword">wchar_t</span></code>
and <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">wstring</span></code>.
</li>
<li class="listitem">
The previous version of <code class="computeroutput"><span class="identifier">lexical_cast</span></code>
assumed that the conventional stream extractor operators were sufficient
for reading values. However, string I/O is asymmetric, with the result
that spaces play the role of I/O separators rather than string content.
The current version fixes this error for <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>
and, where supported, <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">wstring</span></code>:
<code class="computeroutput"><span class="identifier">lexical_cast</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">>(</span><span class="string">"Hello, World"</span><span class="special">)</span></code>
succeeds instead of failing with a <code class="computeroutput"><span class="identifier">bad_lexical_cast</span></code>
exception.
</li>
<li class="listitem">
The previous version of <code class="computeroutput"><span class="identifier">lexical_cast</span></code>
allowed unsafe and meaningless conversions to pointers. The current
version now throws a <code class="computeroutput"><span class="identifier">bad_lexical_cast</span></code>
for conversions to pointers: <code class="computeroutput"><span class="identifier">lexical_cast</span><span class="special"><</span><span class="keyword">char</span>
<span class="special">*>(</span><span class="string">"Goodbye,
World"</span><span class="special">)</span></code> now
throws an exception instead of causing undefined behavior.
</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"></td>
<td align="right"><div class="copyright-footer">Copyright © 2000-2005 Kevlin Henney<br>Copyright © 2006-2010 Alexander Nasonov<br>Copyright © 2011 Antony Polukhin<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>
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