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documentation update

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[SVN r52100]
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Emil Dotchevski
2009-04-01 07:08:24 +00:00
parent 3257e14e02
commit ce05d53365
3 changed files with 1834 additions and 1833 deletions
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doc/motivation.html
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<h3>Exception wrapping</h3>
<p>The idea of exception wrapping is to catch an exception from a lower level function (such as the read_file function above), and throw a new exception object that contains the original exception (and also carries a file name.) This method seems to be particularly popular with C++ programmers with Java background.</p>
<p>Exception wrapping leads to the following problems:</p>
<div><ol><li>To wrap an exception object it must be copied, which may result in slicing.</li>
<div><ul><li>To wrap an exception object it must be copied, which may result in slicing.</li>
<li>Wrapping is practically impossible to use in generic contexts.</li>
</ol></div>
</ul></div>
<p>The second point is actually special case of violating the exception neutrality principle. Most contexts in a program can not handle exceptions; such contexts should not interfere with the process of exception handling.</p>
<h3>The boost::exception solution</h3>
<div><ul><li>Simply derive your exception types from boos::<span class="RenoLink"><a href="exception.html">exception</a></span>.</li>

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doc/source/boost-exception.reno
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