cpp-optparse

This is yet another option parser for C++. It is modelled after the excellent Python optparse API. Although incomplete, anyone familiar to optparse should feel at home.

• Copyright (c) 2010 Johannes Weißl
• License: MIT License

Design decisions

• Elegant and easy usage more important than speed / flexibility
• Small size more important than feature completeness, e.g.:
  • No unicode
  • No checking for user programming errors
  • No conflict handlers
  • No adding of new actions

FAQ

• Why not use getopt/getopt_long?
  • Not C++ / not completely POSIX
  • Too cumbersome to use, would need lot of additional code
• Why not use Boost.Program_options?
  • Boost not installed on all target platforms (esp. cluster, HPC, ...)
  • Too big to include just for option handling for many projects: 322 *.h (44750 lines) + 7 *.cpp (2078 lines)
• Why not use tclap/Opag/Options/CmdLine/Anyoption/Argument_helper/...?
  • Similarity to Python desired for faster learning curve

Future work

• Support nargs > 1?

Example

using optparse::OptionParser;

OptionParser parser = OptionParser() .description("just an example");

parser.add_option("-f", "--file") .dest("filename")
                  .help("write report to FILE") .metavar("FILE");
parser.add_option("-q", "--quiet")
                  .action("store_false") .dest("verbose") .set_default("1")
                  .help("don't print status messages to stdout");

optparse::Values options = parser.parse_args(argc, argv);
vector<string> args = parser.args();

if (options.get("verbose"))
    cout << options["filename"] << endl;