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Subject: Re: [boost] [review] string convert
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2011-05-09 10:25:17

Vladimir Batov wrote:
> > From: "Matt Chambers" <matt.chambers42_at_[hidden]>
> > ...
> > Your examples are hypocritical based on your earlier
> > argument about there not being a meaningful default value
> > for your non-defaultable types. We agreed there is no
> > meaningful default for the "to_be or not_to_be" problem, so
> > your usage here of defaulting it to to_be doesn't make
> > sense. Especially when you proceed to use the return value
> > that's invalid...
> Well, indeed I am such a hypocrite. :-P

Actually, no, it isn't hypocritical. There's a difference between supplying a default in a particular context and one for general use. The default_value CP Vicente suggested provides a default value for use in the context of conversions. Vladimir's I/F is based upon the idea of supplying the default at the point of call. These approaches differ from providing a default constructor that supplies a default for all contexts.

> On the serious note though I feel we are going in circles.
> We've discussed that before. Thare are, in fact, two different
> use-cases:
> 1. the relevant class is not DefaultConstructible;
> 2. the relevant class does not have meaningful fallback.
> These two cases are *separate*.

They can be separate or comingled, but must be addressed separately.

Rob Stewart robert.stewart_at_[hidden]
Software Engineer using std::disclaimer;
Dev Tools & Components
Susquehanna International Group, LLP

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