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#27 Add inequality and range constraints
As far as I can tell, currently only equality constraints are supported, eg. here is a list of values that are supported. This is fine, but cannot express things like "this must be positive" or "this must be between -1 and 9". For these, inequality and range constraints would need to be implemented.
Can't you do this with the Constraint class: https://tclap.sourceforge.net/manual.html#CONSTRAINT? Do you need something different than this?
I guess I should have RTFM with more attention, because yes, that would work. I was searching the doxygen docs for something other than ValuesConstraint and couldn't find any.
Still, I think that inequality and range constraints are both simple and common enough that it would be useful to have them ready-made, instead of asking the users to implement them themselves.
Patches against 1.4 are welcome.