GNU 'gperf' generates perfect hash functions. If a long option shows an argument as mandatory, then it is mandatory for the equivalent short option also. Use this tutorial for effective command-line processing in your C/C++ code:
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Command-line processing is historically one of the most ignored areas in software development. Just about any relatively complicated software has dozens of available command-line options. In fact, it's not uncommon to find hundreds of lines of if-else statements coded to process user input, and maintenance of such legacy code becomes a time-consuming affair even for seasoned programmers. In such circumstances, most C developers commonly go for a rather long (and often nested) if-else statement with ANSI C library functions such as strcmp, strcasecmp, and strtok ...
The gperf utility is tuned to quickly generate a perfect hash for small to medium datasets. But gperf has other applications, as well. In fact, it's the tool of choice of maintaining perfect hashes for language keywords in GNU compilers, and recent advances allow you to work with larger datasets. So, consider making gperf part of your next development project.
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