[boost] Re: is_convertible: rationale and wording

From: Gennaro Prota (gennaro_prota_at_[hidden])
Date: 2003-01-28 10:21:07

On Tue, 28 Jan 2003 12:58:33 -0000, "John Maddock"
<jm_at_[hidden]> wrote:

>> is there, among the uses of is_convertible that you have listed, any
>> usage where no expression could be used (so that you would need to see
>> if the "type" is convertible)?
>
>Yes - named template parameters form the main example of that, concept
>checking another (although in that case you could probably get hold of a
>variable if you really wanted to).

Thanks. Can you provide a minimal example of the technique used to
implement named template arguments?

Genny.