patch: new attribute enable_if

[Chandler Carruth]

On Sun, Sep 22, 2013 at 3:24 AM, Nick Lewycky <nicholas at mxc.ca> wrote:

> The attached patch adds a new attribute named "enable_if" which takes an
> expression and a string. At the call site, the arguments are substituted
> into the enable_if expression (which is written in terms of the parameters)
> to determine whether this function is a viable candidate.
>

What's the motivation? The C++ committee looked at just such a construct
and currently is leaning in a different direction (concepts lite) so it
seems odd to add this as an extension to Clang at this point.


>
> Please review!
>
> Nick
>
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