[vsipl++] PATCH: restrict vsip::operator! to view types

[Stefan Seefeld]

Stefan Seefeld wrote:
> As the subject-line says, the attached patch uses sfinae
> to restrict the unary operators '!' and '~' to operate
> on view types only.

Well, that patch seems to be a little too restrictive. ;-)
Here is a new one, this time with unit test.

Regards,
		Stefan

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