Boost Program Options Optional Value (request for implicit_value() behaviour change to allow space)
Description of the real problem: - let "-b" be the name of the option - it disables, if not present in command line, the general app logging - it enables, if present in command line, the general app logging in a default chosen logfile - it enables, if present in command line with a string argument, the general app logging into the file specified as string argument Usage example:
program_name (no logging) program_name -b (logging enabled; goes to logfile.log) program_name -b "C:\otherlogfile.log" (logs where specified)
So far I found a solution based on implicit_value() behaviour, with "-b" of type string, but my main problem is that in this case I am forced to enter the value to be adjacent to "-b" (e.g. -b"C:\otherlogfile.log"). The desired form would be the one with a space between, in order to maintain our backward compatibility of scripts (e.g: -b "C:\otherlogfile.log"). Can you help me with a good solution? (Even solutions that crack into the source of boost program options library are appreciated.) Thank you for your time. -- Kind regards, Andrei LIHU -------------------- softNRG C++ Software Developer +40742545392
On Wed, 08 Oct 2008 11:23:29 +0200, Andrei LIHU <andrei.lihu@gmail.com> wrote:
[...]So far I found a solution based on implicit_value() behaviour, with "-b" of type string, but my main problem is that in this case I am forced to enter the value to be adjacent to "-b" (e.g. -b"C:\otherlogfile.log"). The desired form would be the one with a space between, in order to maintain our backward compatibility of scripts (e.g: -b "C:\otherlogfile.log").
If -b is a short option I would have thought that command_line_style::short_allow_next does what you want? Boris
Well, I thought so, but I tested that , and it doesn't do that. Here are my styles: po::command_line_style::style_t pstyle = po::command_line_style::style_t( po::command_line_style::short_allow_next | po::command_line_style::allow_dash_for_short | po::command_line_style::allow_long | po::command_line_style::allow_short | po::command_line_style::long_allow_next | po::command_line_style::case_insensitive | po::command_line_style::allow_long_disguise ); // store the values in the variables' map po::store(po::basic_command_line_parser<TCHAR>(args).style(pstyle).options(m_cmdlineOptions).allow_unregistered().run(), m_vm); po::notify(m_vm); 2008/10/8 Boris <boriss@web.de>:
On Wed, 08 Oct 2008 11:23:29 +0200, Andrei LIHU <andrei.lihu@gmail.com> wrote:
[...]So far I found a solution based on implicit_value() behaviour, with "-b" of type string, but my main problem is that in this case I am forced to enter the value to be adjacent to "-b" (e.g. -b"C:\otherlogfile.log"). The desired form would be the one with a space between, in order to maintain our backward compatibility of scripts (e.g: -b "C:\otherlogfile.log").
If -b is a short option I would have thought that command_line_style::short_allow_next does what you want?
Boris
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-- Kind regards, Andrei LIHU -------------------- Soft NRG C++ Software Developer +40742545392
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Boris