Arg_parser is an argument parser that follows POSIX and GNU conventions for command line arguments. The C++ version is implemented as a C++ class, while the C version is implemented as a single struct plus associated functions. Both are simpler, easier to use, and safer that `getopt_long'.
For maximum stability, Arg_parser is self-contained. It extracts all the information it needs from its arguments to avoid refering to them later. This avoids index-out-of-bounds errors.
Arg_parser does not modify its arguments, nor uses any global variables. So you may create more than one parser in your program if you need or want to.
The C++ version of Arg_parser can also parse options from configuration files.
To use Arg_parser in your own programs simply copy the files `arg_parser.h' and `arg_parser.cc' (or `carg_parser.h' and `carg_parser.c' for the C version) in your source tree. See also the file `main.cc' (`cmain.c') for an example of use.
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