Reuse integral_constant and enable_if in <functional>

[Daniel Frey]

On 26.01.2010, at 14:34, Paolo Carlini wrote:

> ... I went ahead and committed it in this very slightly tweaked form.
> Tested x86_64-linux without PCHs.

Thanks Paolo. I've been away from my computer, so I couldn't reply earlier and take care of it myself. Anyway, will try to add a Changelog entry next time I propose a patch.

Daniel

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