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Subject: Re: [boost] [review] string convert
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2011-05-05 15:27:16

Jeremy Maitin-Shepard wrote:
> On 05/05/2011 10:32 AM, Stewart, Robert wrote:
> > Jeff Flinn wrote:
> >> Stewart, Robert wrote:
> >>> If one wants an exception to indicate conversion failure,
> >>> an initial value is needed and the desire for an exception
> >>> must be noted:
> >>>
> >>> example const e(convert_cast<example>("1", 3, throw_));
> >>
> >> Sorry if I'm just being dense, but if the above throws, the
> >> default value is never used, so why supply it?
> >
> > Think about how convert_cast() might be implemented:
> [snip]
> Is conflating the fallback value with the initial value used by
> a stringstream-based implementation really a good idea?

In that overload, there is no fallback value. It is the initial value.

In a nothrow overload, the two would be conflated.

However, the default_value CP eliminates this need.

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

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