Hi all, I can't find anything in the docs that tells me whether this is possible without writing custom parsers etc. so if anyone knows whether this can be done please let me know. I'd like to be able to use position-sensitive parameters. For example, a program to work with .zip files: zip --rename=one.bin:alpha.bin --add=one.bin --rename=one.bin:beta.bin Using this example, the initial --rename would need to be acted upon first, before -add (otherwise one.bin would get overwritten) and likewise the last --rename must be acted upon after -add, otherwise the wrong file (or no file) would be renamed. If I use normal string vectors the order of the parameters will be lost so this won't work. Is this sort of parsing possible with program_options? Thanks, Adam.