Abstract automatic hidden index key for options.  
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| OptionKeyList &  | utility::options::operator+ (OptionKeyList &key_list, OptionKey const &key) | 
|   | Convenience function for appending an option key to an option key list (which itself is a list of pointers to OptionKeys, using the VariantKey class) so that many option keys can be appended by simply chaining a set of calls using "+".  More...
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Abstract automatic hidden index key for options. 
- Author
 - Stuart G. Mentzer (Stuar.nosp@m.t_Me.nosp@m.ntzer.nosp@m.@obj.nosp@m.exx.c.nosp@m.om)