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- We could either implement simple chaining for variable maps, or
- implement generic composition classes. The former was choosen,
- mostly because of simplicity.
- There were two implementation approaches for multiple option
- occurrences in options_and_arguments. First is store them
- separately. The advantage is that it's easy to obtain all
- occurrences before certain position on command line. The
- disadvantage is that we cannot return a reference to
- vector<vector<string> > in get_all_values. It was considered
- that if support for position-dependent options is to be
- added, then we're be mostly interested in occurrences of
- a single option that were before some point. That's possible
- with vector<vector<string> > storage.
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