2011-09-13 17:44:24 +00:00
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<title>Dbstl known issues</title>
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2012-11-14 21:35:20 +00:00
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<p>Library Version 11.2.5.3</p>
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2011-09-13 17:44:24 +00:00
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<th colspan="3" align="center">Dbstl known issues</th>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="stl_misc.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 7. Standard Template Library API</th>
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<h2 class="title" style="clear: both"><a id="stl_known_issues"></a>Dbstl known issues</h2>
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</div>
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</div>
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</div>
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<p>
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Three algorithm functions of gcc's C++ STL test suite do not work with dbstl. They are
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<code class="function">find_end()</code>, <code class="function">inplace_merge()</code> and
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<code class="function">stable_sort()</code>.
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</p>
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<p>
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The reason for the incompatibility of <code class="function">find_end()</code> is that it assumes the
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data an iterator refers to is located at a shared place (owned by its container). This
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assumption is not correct in that it is part of the C++ STL standards specification. However,
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this assumption can not be true for dbstl because each dbstl container iterator caches its
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referenced value.
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</p>
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<p>
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Consequently, please do not use <code class="function">find_end()</code> for dbstl container iterators if
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you are using gcc's STL library.
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</p>
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<p>
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The reason for the incompatibility with <code class="function">inplace_merge()</code> and
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<code class="function">stable_sort()</code> is that their implementation in gcc requires the
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<span class="bold"><strong>value_type</strong></span> for a container to be default constructible. This
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requirement is not a part of the the C++ STL standard specification. Dbstl's value type
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wrappers (such as <code class="classname">ElementHolder</code>) do not support it.
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</p>
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<p>
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2011-12-20 00:07:10 +00:00
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These issues do not exist for any function available with the Microsoft
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Visual C++ 8 STL library. There are two algorithm functions of Microsoft
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Visual C++ 10 STL library that do have an issue:
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<code class="function">partial_sort()</code> and
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<code class="function">partial_sort_copy()</code>. These are not compatible because they
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require the dbstl <code class="literal">vector</code> iterator to create a new
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element when updating the current element. Dbstl
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<code class="literal">vector</code> iterator can copy the new content to the
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current element, but it cannot create a new one. This requirement is
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not a part of the C++ STL standard specification, and so dbstl's
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<code class="literal">vector</code> iterator does not support it.
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2011-09-13 17:44:24 +00:00
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<td width="40%" align="right"> <a accesskey="n" href="arch.html">Next</a></td>
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<td width="40%" align="left" valign="top">Dbstl miscellaneous notes </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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<td width="40%" align="right" valign="top"> Chapter 8.
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Berkeley DB Architecture
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