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From: Andrew Sutton (asutton_at_[hidden])
Date: 2007-07-10 09:25:34

On Jul 10, 2007, at 9:02 AM, Cédric Venet wrote:

>> 2. I've run into the situation where parameters are truly optional -
>> they don't specify default values, but optional components to an
>> algorithm. What's the best way to implement this? How can I test
>> (within a function) to determine if a parameter has been passed or
>> not? I've hacked together an approach using a `not_given` struct. Is
>> there something already like this in the library.
> boost.optional should serve your purpose.

I had previously considered that as an option (no pun).
Unfortunately, I don't think this helps if I choose to adopt a
compile-time function selection. Otherwise, it would work very nicely
at runtime. I've still got it on my short list of solutions.


Andrew Sutton

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