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From: Cédric Venet (cedric.venet_at_[hidden])
Date: 2007-07-10 10:06:19

Quoting Andrew Sutton <asutton_at_[hidden]>:

>> I'm not clear what your "truly optional" parameters are actually
>> for, but if (for example) they supply a functor could the default
>> value be some sort of identity functor?
> I guess it might be worthwhile to distinguish formally between
> optional parameters and those with default values. A parameter with
> default values is still a required input to a function even if the
> user doesn't explicitly pass a corresponding value. It's value is
> supplied by the specification. An optional parameter is one affects
> the function's behavior by its absence or presence in the argument list.

did you read:

it does what I was trying to explain in my previous mail automaticaly
and should correspond to your need (optionnal parameter and compile
time function dispatching).

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