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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> |
| <li><font size="4">No dependency on C++ exceptions</font><br> |
| <font size="4">-- Not all C++ compilers handle exceptions</font> <br> |
| <font size="4">-- Exceptions not supported in C</font> </li> |
| <li><font size="4">Allows multithreading</font></li> |
| </ul> |
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| <p><font size="5">Usage:</font> |
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| <ul> |
| <li><font size="4">Caller allocates the error code</font><br> |
| <font size="3">-- on stack, local variable, input parameter</font> </li> |
| <li><font size="4">Caller sets error code to ZERO_ERROR when allocated</font></li> |
| <li><font size="4">Pass error code by reference to each function</font></li> |
| <li><font size="4">Functions that can signal an error</font><br> |
| <font size="3">-- Check error code on entry</font> <br> |
| <font size="3">-- Return immediately if not ZERO_ERROR</font> <br> |
| <font size="3">-- Pass same error code through to called functions</font> </li> |
| <li><font size="4">When error code is not ZERO_ERROR</font><br> |
| <font size="3">-- Attempt to cleanup allocated storage</font> <br> |
| <font size="3">-- Return</font></li> |
| </ul> |
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| <p><a href="codeConv.html"><font size="3">code conventions</font></a> </p> |
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