44 lines
1.5 KiB
HTML
44 lines
1.5 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="GENERATOR" content="Microsoft FrontPage 3.0">
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<title>ErrorCode</title>
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</head>
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<body bgcolor="#FFFFFF">
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<h1><font size="5">Error Handling (UErrorCode)</font></h1>
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<p><font size="5">Justification:</font>
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<ul>
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<li><font size="4">No dependency on C++ exceptions</font><br>
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<font size="4">-- Not all C++ compilers handle exceptions</font> <br>
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<font size="4">-- Exceptions not supported in C</font> </li>
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<li><font size="4">Allows multithreading</font></li>
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</ul>
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<p><font size="5">Usage:</font>
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<ul>
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<li><font size="4">Caller allocates the error code</font><br>
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<font size="3">-- on stack, local variable, input parameter</font> </li>
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<li><font size="4">Caller sets error code to ZERO_ERROR when allocated</font></li>
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<li><font size="4">Pass error code by reference to each function</font></li>
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<li><font size="4">Functions that can signal an error</font><br>
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<font size="3">-- Check error code on entry</font> <br>
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<font size="3">-- Return immediately if not ZERO_ERROR</font> <br>
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<font size="3">-- Pass same error code through to called functions</font> </li>
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<li><font size="4">When error code is not ZERO_ERROR</font><br>
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<font size="3">-- Attempt to cleanup allocated storage</font> <br>
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<font size="3">-- Return</font></li>
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</ul>
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<p><a href="codeConv.html"><font size="3">code conventions</font></a> </p>
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<p> </p>
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</body>
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</html>
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